EXHIBIT 31.3



CERTIFICATIONS



I, Robin L. Smith, certify that:



1. I have reviewed this Amendment No. 1 to the Annual Report
on Form 10-K of NeoStem, Inc.;



2. Based on my knowledge, this report does not contain any untrue
statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances
under which such statements were made, not misleading with respect to the period covered by this report;



3. Based on my knowledge, the financial statements, and other
financial information included in this report, fairly present in all material respects the financial condition, results of operations
and cash flows of the registrant as of, and for, the periods presented in this report;



4. The registrant’s other certifying officer and I are
responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and
15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant
and have:



| | (a) | Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our
supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known
to us by others within those entities, particularly during the period in which this report is being prepared;
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| | (b) | Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed
under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of
financial statements for external purposes in accordance with generally accepted accounting principles;
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| | (c) | Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions
about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on
such evaluation; and
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| | (d) | Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during
the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report)
that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial
reporting; and
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5. The registrant’s other certifying officer and I have
disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors
and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):



| | (a) | All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting
which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial
information; and
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| | (b) | Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s
internal control over financial reporting.
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|Date: April 27, 2012 | /s/ Robin L. Smith M.D.                                             
|-------------------- | --------------------------------------------------------------------
|                     | Name: Robin L. Smith M.D.                                           
|                     | Title: Chief Executive Officer
        (Principal Executive Officer)

A signed original of this written statement required by Section
302 has been provided to the Corporation and will be retained by the Corporation and furnished to the Securities and Exchange
Commission or its staff upon request.