EXHIBIT 31

                 Certificate of the Chief Executive Officer and
                         Acting Chief Financial Officer
                     Pursuant to 15 U.S.C. 78m(a) or 78o(d)
                 (Section 302 of the Sarbanes-Oxley Act of 2002)


I, Michael A.  Grollman,  Chairman of the Board of  Directors,  Chief  Executive
Officer and Acting Chief Financial  Officer of National  Scientific  Corporation
hereby certify that:

     (1)  I have  reviewed  this annual report on Form 10-KSB of the Company for
          fiscal year ended September 30, 2003;

     (2)  Based on my knowledge,  this annual 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 annual report;

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

     (4)  I am responsible for establishing and maintaining  disclosure controls
          and  procedures  (as defined in Exchange  Act Rules 13a-14 and 15d-14)
          for the Company and I have:

          (a)  designed such  disclosure  controls and procedures to ensure that
               material  information  relating  to the  Company,  including  its
               consolidated  subsidiaries,  is made known to me by others within
               those  entities,  particularly  during  the  period in which this
               annual report is being prepared;

          (b)  evaluated the effectiveness of the Company's  disclosure controls
               and  procedures  as of a date  within 90 days prior to the filing
               date of this annual report (the "Evaluation Date"); and

          (c)  presented  in  this  annual  report  my  conclusions   about  the
               effectiveness of the disclosure  controls and procedures based on
               my evaluation as of the Evaluation Date;

     (5)  I have disclosed, based on my most recent evaluation, to the Company's
          auditors and the audit  committee of Company's  board of directors (or
          persons performing the equivalent function):

          (a)  all  significant  deficiencies  in the  design  or  operation  of
               internal  controls  which could  adversely  affect the  Company's
               ability to record,  process,  summarize and report financial data
               and have  identified  for the  Company's  auditors  any  material
               weaknesses in internal controls; 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  Company's
               internal controls; and

     (6)  I have  indicated  in this  annual  report  whether  or not there were
          significant  changes in  internal  controls or in other  factors  that
          could significantly affect internal controls subsequent to the date of
          my most recent  evaluation,  including  any  corrective  actions  with
          regard to significant deficiencies and material weaknesses.

IN WITNESS  WHEREOF,  the undersigned has executed this  certificate on the 14th
day of January, 2004.


/s/ Michael A. Grollman
--------------------------------------------
Michael A. Grollman
Chief Executive Officer,
Acting Chief Financial Officer,
and Chairman


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