Exhibit 1.2

This text is a free translation from the French language and is supplied solely for information purposes.

Only the original version in the French language has legal force.

SANOFI BOARD CHARTER

The Internal Rules describe the rights and duties of Board members; the composition, role and operating procedures of the Board of Directors and Board
committees; and the roles and powers of the Chairman and the Chief Executive Officer.

The Board of Directors, at its meeting of
December 17, 2008, decided to refer to the AFEP-MEDEF corporate governance code, as most recently updated in April 2010 (hereinafter the AFEP-MEDEF code).



|I. | COMPOSITION OF THE BOARD OF DIRECTORS
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At
least half of the members of the Board of Directors shall be independent Directors.

The independence of Directors shall be assessed by
reference to the AFEP-MEDEF code.

It shall be the responsibility of the Board of Directors, acting on proposals from the Appointments and
Governance Committee, to assess the independence of each of its members, and then to inform the shareholders of the conclusions of such assessments in the French-language document de référence (hereinafter the Reference
Document) and at the Shareholders General Meeting at which the Directors are proposed for election.

The independence of Directors
shall be reassessed by the Board of Directors annually prior to publication of the Reference Document.

With respect to the composition of the
Board of Directors and its committees, the Board of Directors shall take care to establish an appropriate balance among their members, including in terms of the representation of men and women and the diversity of expertises, while taking the
necessary measures to provide shareholders and the market with the assurance that their respective missions are carried out with the requisite independence and objectivity.



|II. | ETHICAL DUTIES OF SANOFI DIRECTORS
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When
a Director assumes office, the Secretary to the Board shall provide him or her with an information pack, to include inter alia the by-laws and the present Internal Rules. Each Director shall ensure that he or she is aware of and complies with the
obligations placed upon him or her by the relevant laws and regulations, the by-laws, and the internal rules of the Company.

In addition to
his or her obligations under the by-laws, within two years, each Director shall hold 1,000 Sanofi shares in his or her own name. Directors shall be required to convert into registered form any financial instruments of the Company they may hold at
the time they assume office, and any that they may acquire during their term of office.

When a Director participates in Board deliberations
and votes at Board meetings, he or she represents all the shareholders of the Company and shall act in the Companys corporate interests.

In preparing for meetings of the Board and of Committees on which they sit, Directors shall devote the time necessary to examining the supporting
documentation sent to them.

Unless they inform the Chairman in advance of their absence, Directors shall participate in all meetings of the
Board and of the Committees on which they sit, as well as in Shareholders General Meetings.

A Director must keep himself or herself
informed, and hence must request from the Chairman on a timely basis such information as he or she regards as essential for making a useful contribution regarding the issues included on the agenda.



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Files for Board meetings, and information received prior to or during Board meetings, shall be treated as
confidential by Directors. No Director may supply such information to a third party for any reason whatsoever, and Directors shall take all necessary measures to ensure that such confidentiality is protected. As regards unpublished information
obtained in the course of their duties, Directors shall regard themselves as bound by an obligation of professional secrecy that goes beyond the mere duty of discretion as stipulated by the relevant laws and regulations.

A Director may not use his title or office as Director to obtain for himself or herself, or for a third party, any pecuniary or non-pecuniary benefit.

Directors shall be entitled to be reimbursed for travel expenses they incur in the interests of the Company, on presentation of supporting
documentation.

Directors shall inform the Board of any actual or potential conflict of interest with the Company or its subsidiaries, and
shall abstain from voting on such matters.

Any Director who is involved in a personal capacity in a transaction in which Sanofi has a direct
interest or of which he or she became aware in his or her capacity as a Director shall inform the Board thereof prior to completion of such transaction.

No Director, and no permanent representative of a Director that is a corporate entity, may be involved in a personal capacity in any business or venture that is in competition with Sanofi without having
previously informed the Board of Directors and obtained its consent.

Directors shall be ready to tender their resignation to the Board of
Directors in the event that their other activities and board memberships change substantially.

A Director who determines that he or she is no
longer capable of assuming his or her function within the Board or its committees shall resign.

Directors who are in possession of privileged
information must, for as long as this information has not been made public, refrain from directly or indirectly entering into (or recommending others to enter into) any transaction involving the financial instruments of the Company (shares, ADRs,
CVRs, bonds, futures, etc) and from disclosing such information to third parties.

Privileged information is specific information which has
not yet been made public and which relates directly or indirectly to one or more issuers of financial instruments, or to one or more financial instruments, and which if it were made public would be liable to have a significant influence on the price
of the financial instruments in question or on the price of associated financial instruments.

Directors shall also refrain from trading in
the financial instruments of the Company during the 30 calendar days preceding the announcement of the annual results and during the 15 calendar days preceding the announcement of the half-year and quarterly results, with the ability to resume
trading the day after the results are publicly announced.

Directors shall refrain from entering into speculative or hedging transactions, in
particular derivatives transactions and short selling.

As required by law, Directors shall declare their transactions in the financial
instruments of the Company to the Autorité des marchés financiers, with a copy sent to the Secretary of the Board.



|III. | ROLE OF THE BOARD OF DIRECTORS
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The Board
shall deliberate on issues that are within its competence by law or under the by-laws.

The Board of Directors shall determine the
orientations of the Companys activities and oversee the implementation of such orientations. Subject to those powers expressly attributed to shareholders meetings and within the limits set by the corporate objects, the Board of Directors
shall address any issue of relevance to the proper conduct of the Companys affairs and shall, through its deliberations, settle matters concerning the Company.



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Within the scope of its role, the Board shall inter alia:



| |  | determine the strategic orientations of the Company and of the Group, based on advice from the Strategy Committee;
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| |  | approve commitments in respect of investments, acquisitions and divestments that exceed the limits placed on the powers of the Chief Executive Officer;
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| |  | authorize the Chief Executive Officer to grant guarantees in the Companys name, including to the tax and customs authorities;
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| |  | be kept informed of any important event affecting the affairs of the Company;
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| |  | appoint executive officers responsible for managing the business within the framework of the strategy, decide on the governance rules for executive
officers (separation or combination of the offices of Chairman and Chief Executive Officer), and oversee their management;
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| |  | set the compensation payable to the executive officers, acting on proposals from the Compensation Committee;
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| |  | establish the Companys financial communication policy and oversee the quality of information provided to shareholders and to the markets, in
particular via the financial statements or on the occasion of very significant corporate actions;
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| |  | be kept regularly informed by the Audit Committee of the financial position, cash position and commitments of the Company;
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| |  | call, and prepare the agenda for, shareholders meetings;
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| |  | approve the Chairmans report on corporate governance and internal control and risk management procedures stipulated at article L. 225-37 of the
French Commercial Code (the Chairmans Report).
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|IV. | OPERATING PROCEDURES OF THE BOARD OF DIRECTORS
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Meetings



| |  | The Board of Directors shall meet no less than four times a year, and whenever circumstances require.
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| |  | Directors may choose to be represented by another Director at meetings of the Board of Directors. Each Director may represent no more than one other
Director at any Board meeting.
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| |  | Directors who participate in a Board meeting by video-conference or telecommunication links that enable them to be identified and effectively
participate in the meeting and that comply with the technical specifications stipulated in the relevant regulations shall be deemed to be present for the purposes of determining quorum and majority at such meetings. By law, such methods cannot be
used for certain decisions.
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Evaluation



| |  | A discussion of the operating procedures of the Board shall be included on the agenda of one Board meeting a year. Every three years, a formal
evaluation shall be performed, to include the committees established by the Board as well as the Board itself. A report shall be published in the Reference Document.
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Information



| |  | Other than in exceptional circumstances, Directors shall within a reasonable period in advance of each meeting receive the agenda for the meeting and
all necessary information for their consideration.
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| |  | They shall also be provided with information at any time between Board meetings if necessary.
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| |  | Directors must be able to meet the Companys principal executives, and may do so without the Chairman and the Chief Executive Officer being
present provided that the Chairman and the Chief Executive Officer are given prior notice.
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Training



| |  | Each Director may, if he or she sees fit, receive training on the specific characteristics of the Company and its businesses and sectors, and on the
role of a Director.
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Committees



| |  | The Board shall establish an Audit Committee within the terms of the law.
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| |  | The Board shall assess the appropriateness of establishing other permanent or ad hoc specialist committees, and determine the composition of such
committees in light of the issues they are required to address. The Board shall ensure that such committees function properly.
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Attendance fees



| |  | Within the overall limit set by the Shareholders General Meeting, the Board shall allocate attendance fees to the Directors, and may allocate
additional attendance fees to Directors who sit on specialist committees to reflect the time they devote to such committees. The Board may also allocate additional attendance fees to Directors living outside France to reflect the necessity of their
traveling to attend meetings.
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Secretary to the Board



| |  | The Board, acting on a proposal from the Chairman, shall appoint a Secretary. All members of the Board may consult the Secretary and make use of his or
her services. The Secretary shall ensure that the Boards operating procedures are complied with and shall establish minutes of its meetings.
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|V. | ROLES AND POWERS OF THE CHAIRMAN AND THE CHIEF EXECUTIVE OFFICER
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| |  | The Chairman shall represent the Board of Directors and, other than in exceptional circumstances, shall have sole authority to act and speak on
behalf of the Board of Directors.
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The Chairman shall organize and direct the work of the Board of Directors and ensure that
the corporate decision-making bodies are operating effectively in accordance with the principles of good governance. He or she shall co-ordinate the work of the Board of Directors with that of the committees.

He or she shall ensure that Directors have access on a timely basis to clear and appropriate information required for the performance of their duties.

The Chairman shall, in coordination with the Chief Executive Officer, liaise between the Board of Directors and the shareholders of the
Company.

The Chairman shall be kept regularly informed by the Chief Executive Officer of significant events and situations affecting the
affairs of the Group, especially in the areas of strategy, organization, financial reporting, major investment and divestment proposals, and major corporate actions. He or she may request from the Chief Executive Officer any information useful to
the Board of Directors.

In close collaboration with the Corporate Management, the Chairman may represent the Company in high-level dealings
with governmental bodies and with the Groups key partners, both nationally and internationally, as well as playing a role in defining the Groups major strategic choices, especially as regards external growth.

The Chairman shall strive to promote in all circumstances the values and the image of the Company.

He or she may interview the statutory auditors in preparation for the work of the Board of Directors and the Audit Committee.

The Chairman shall prepare the Chairmans Report.



| |  | The Chief Executive Officer shall assume responsibility for the general management of the Company, and shall chair the Executive Committee and
the Global Leadership Team.
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He or she shall have the broadest powers to act in the name of the Company in all
circumstances, subject to powers attributed by law to the Board of Directors or the Shareholders General Meeting and subject to the Companys own corporate governance rules.

At each Board meeting, the Chief Executive Officer shall present a report on significant matters affecting the Groups affairs.



|VI. | AUDIT COMMITTEE
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The Audit Committee
shall perform its duties under the responsibility of the Board of Directors.



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|1. | Role of the Committee
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The Committee
shall oversee matters relating to the preparation and audit of accounting and financial information. Without prejudice to the powers of the Board of Directors, the Committee shall inter alia be responsible for overseeing:



| |  | the process for the preparation of financial information;
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| |  | the effectiveness of the internal control and risk management systems;
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| |  | the audit of the parent company financial statements and consolidated financial statements by the statutory auditors;
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| |  | the independence of the statutory auditors.
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The role of the Committee shall be not so much to examine the financial statements in detail as to monitor the process of preparing them and to assess the validity of elective accounting treatments used
for significant transactions.

In fulfilling its role, the Committee shall interview the statutory auditors and the officers responsible for
finance, accounting, and treasury management. It shall be possible for such interviews to take place without the Chief Executive Officer being present if the Committee sees fit. The Committee may also visit or interview managers of operational
entities in furtherance of its role, having given prior notice to the Chairman of the Board and to the Chief Executive Officer.

The Committee
shall interview the person responsible for internal audit, and give its opinion on the organization of the internal audit function. The Committee is to receive internal audit reports or a periodic summary of such reports.

The Committee examines the scope of consolidation and, if applicable, the reasons for an entitys inclusion or exclusion from that scope.

The Committee has authority to consult external experts at the Companys expense, after first informing the Chairman of the Board or the
Board of Directors, and shall report on its use of such authority to the Board of Directors.

Sufficient time shall be allowed for the
financial statements to be examined (at least two days prior to the examination of the financial statements by the Board).

The examination of
the financial statements by the Audit Committee shall be accompanied by a presentation by the statutory auditors highlighting key issues not only regarding the financial results but also the elective accounting treatments used, along with a
presentation by the Chief Financial Officer describing the Groups risk exposure and significant off balance sheet commitments.

In
addition, the Committee shall:



| |  | direct the selection process for the statutory auditors when their mandates are due for renewal, submit the results of this process to the Board of
Directors, and issue a recommendation;
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| |  | be informed of the fees paid to the statutory auditors, ensure that the signatory partners are rotated, and oversee compliance with other rules
relating to auditor independence;
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| |  | in conjunction with the statutory auditors, assess any factors which may compromise their independence and any measures taken to mitigate such risk;
the Committee shall verify that neither the absolute amount of fees paid by the Company and by the Group nor its share in the revues of the audit firm and its network are of a nature to compromise the independence of the statutory auditors;
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| |  | approve in advance any request to the statutory auditors to provide services that are incidental or complementary to the audit of the financial
statements, in compliance with the relevant laws;
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| |  | ensure that internal early warning procedures relating to accounting, internal accounting controls and audit are in place and applied;
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| |  | ensure that independent Directors receive no compensation other than attendance fees.
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|2. | Composition of the Committee  Operating Procedures
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The Audit Committee shall have at least three members, appointed by the Board from among the Directors other than the Chairman or Chief Executive Officer. At least two-thirds of its members must be
independent directors. The Committee members may not include a Director belonging to another company the audit committee of which includes a Sanofi Director among its members. Members of the Committee must have financial or accounting skills.

At least one member must qualify as a financial expert within the meaning of French legislation and within the meaning of U.S. securities
legislation.

On appointment to the Audit Committee, members must be provided with information about the accounting, financial and operational
characteristics of the business.

Members shall serve on the Committee for a period concurrent with their term of office as Director, and may
be reappointed at the time of their re-election as a Director.

The chairman of the Audit Committee shall be appointed by the Board of
Directors acting on a proposal from the Appointments and Governance Committee.

Before reappointing a Director for an additional term as
chairman of the Audit Committee, the Board must hold a special review.

The chairman shall appoint a secretary to the Committee who shall
establish minutes of its meetings.

The Committee shall meet as often as the Committee chairman sees fit and in any event no less than four
times a year, in particular prior to publication of the financial results. The Chairman of the Board may call a meeting of the Committee if he or she sees fit.

No member of the Committee may be represented thereon by another person.

The chairman of the
Committee shall report regularly on its work to the Board of Directors, and inform the Board without delay of any difficulties that arise.

The Reference Document shall include a description of the Committees work during the past financial year.

Decisions shall be made by the Committee on a simple majority. In the event of a tied vote, the chairman of the Committee shall have a casting vote.



|VII. | COMPENSATION COMMITTEE
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The Compensation
Committee shall perform its duties under the responsibility of the Board of Directors.

1. Role of the Committee

The role of the Committee shall be to:

a) make
recommendations and proposals to the Board about the compensation, pension and welfare plans, top-up pension plans, benefits in kind and other pecuniary benefits of the Chairman and the Chief Executive Officer of Sanofi, and about the granting of
restricted or performance shares and stock options;

b) define the methods used to set the variable portion of the compensation of the
Chairman and the Chief Executive Officer, and check that these methods are applied;

c) formulate general policy on the granting of restricted
or performance shares and stock options, and determine the frequency of grants for each category of grantee;

d) review the system for
allocating attendance fees between Directors;

e) advise the Chief Executive Officer on the compensation of key senior executives.

The Compensation Committee shall also assist in the preparation of the sections of the Reference Document dealing with the policy on the granting of
purchase or subscription stock options and free or performance shares, and with executive compensation.



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The Committee has authority to consult external experts at the Companys expense, after first
informing the Chairman of the Board or the Board of Directors, and shall report on its use of such authority to the Board of Directors.

The
Committee is to also be kept informed of the compensation policy in place for the key senior executives other than the Chairman and the Chief Executive Officer. On these occasions, the Committee shall meet in the presence of the Chairman and the
Chief Executive Officer.

2. Composition of the Committee  Operating Procedures

The Committee shall consist of at least three members chosen by the Board from among the Directors, excluding the Chairman and the Chief Executive
Officer. However, when the compensation policy for key senior executives other than the Chairman and the Chief Executive Officer is examined, the Chairman and the Chief Executive Officer shall participate in the Committee meeting.

The Committee shall be made up of a majority of independent Directors. The Committee members may not include a Director belonging to another company the
compensation committee of which includes a Sanofi Director among its members

Members shall serve on the Committee for a period concurrent
with their term of office as a Director, and may be reappointed at the time of their re-election as a Director.

The chairman of the
Compensation Committee shall be appointed by the Board of Directors acting on a proposal from the Appointments and Governance Committee.

The
chairman shall appoint a secretary to the Committee who shall establish minutes of its meetings.

The Committee shall meet as often as the
Committee chairman sees fit and in any event no less than twice a year The Chairman of the Board may call a meeting of the Committee if he or she sees fit.

No member of the Committee may be represented thereon by another person.

The chairman of the
Committee shall report on its work to the Board of Directors.

The Reference Document shall include a description of the Committees work
during the past financial year.

Decisions shall be made by the Committee on a simple majority. In the event of a tied vote, the chairman of
the Committee shall have a casting vote.

VIII  APPOINTMENTS AND GOVERNANCE COMMITTEE

The Appointments and Governance Committee shall perform its duties under the responsibility of the Board of Directors.

1. Role of the Committee

The role of
the Committee shall be to:

a. recommend suitable candidates to the Board for appointment as Directors or executive officers taking into
account the desired composition of the Board in light of the composition of, and changes in, the Companys shareholder base, the experience and skills needed for the Boards missions, and the gender balance of the Board;

b. establish corporate governance rules for the Company, and oversee the application of those rules;

c. ensure that there is adequate succession planning for the Companys executive bodies, in particular through the establishment of a succession
plan for the Chairman and the Chief Executive Officer so that replacement solutions may be proposed in the event of unplanned vacancies;

d.
oversee compliance with ethical standards within the Company and in its dealings with third parties;

e. establish a procedure for the
selection of future independent Directors and to carry out studies of potential candidates prior to any contact therewith;



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f. determine whether each Director qualifies as being independent, both on his or her initial appointment
and annually prior to publication of the Reference Document, and report its conclusions to the Board of Directors; the Committee may set independence criteria based on those set out in the AFEP-MEDEF Code;

g. debate the skills and/or financial expertise of Directors named to the Audit Committee and report its conclusions to the Board of Directors;

h. propose methods for evaluating the operating procedures of the Board and its committees, and oversee the application of these methods;

i. examine the Chairmans report on corporate governance.

The Committee has authority to consult external experts at the Companys expense, after first informing the Chairman of the Board or the Board of Directors, and shall report on its use of such
authority to the Board of Directors.



|2. | Composition of the Committee  Operating Procedures
|-- | ---------------------------------------------------

A majority of the Committees members shall be independent Directors.

The chairman of the
Appointments and Governance Committee shall be appointed by the Board of Directors acting on a proposal from the Committee.

The Chairman
shall appoint a secretary to the Committee who shall establish minutes of its meetings.

Members shall serve on the Committee for a period
concurrent with their term of office as Director, and may be reappointed at the time of their re-election as a Director.

The Committee shall
meet as often as the Committee chairman sees fit and in any event no less than twice a year. The Chairman of the Board may call a meeting of the Committee if he or she sees fit.

No member of the Committee may be represented thereon by another person.

The chairman of the
Committee shall report on its work to the Board of Directors.

The Reference Document shall include a description of the Committees work
during the past financial year.

Decisions shall be made by the Committee on a simple majority. In the event of a tied vote, the chairman of
the Committee shall have a casting vote, except in the case of decisions that relate to himself or herself.

IX STRATEGY COMMITTEE

The Strategy Committee shall perform its duties under the responsibility of the Board of Directors.



|1. | Role of the Committee
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The Strategy
Committee is tasked with assessing major strategic orientations with a view to the development of the Companys business.

It shall brief
the Board of Directors on issues of major strategic interest, such as:



| |  | external growth opportunities;
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| |  | divestment opportunities;
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| |  | development priorities;
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| |  | financial and stock market strategies, and compliance with key financial ratios;
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| |  | potential diversification opportunities;
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| |  | and more generally, any course of action judged essential to the Companys future.
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|2. | Composition of the Committee  Operating Procedures
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The Committee shall consist of the Chairman of the Board, the Chief Executive Officer and at least three Directors.



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It shall be chaired by the Chairman of the Board of Directors.

The Chairman shall appoint a secretary to the Committee who shall establish minutes of its meetings.

It shall meet as often as is deemed necessary, with meetings called by the chairman of the Committee or at the request of a majority of its members.

Decisions on proposals to be put to the Board shall be made on a simple majority. In the event of a tied vote, the chairman of the Committee
shall have a casting vote.

The chairman of the Committee shall report to the Board of Directors on the work of the Committee.



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