Exhibit 5.1

                                                                    June 9, 2006

TETRAGENEX INC

          Re: Registration Statement on
              Form SB-2 (The "Registration Statement")
              ----------------------------------------

Gentlemen:

        You have requested our opinion as to the legality of the issuance by you
(the "Corporation") of 23,055,995 shares of common stock ("Shares"), all as
further described in the Registration Statement filed with the U.S. Securities
and Exchange Commission on June 9, 2006, as amended.

        As your counsel, we have reviewed and examined:

        1.   The Certificate of Incorporation of the Corporation;

        2.   The Bylaws of the Corporation;

        3.   A copy of certain resolutions of the corporation; and

        4.   The Registration Statement to be filed

        In giving our opinion, we have assumed without investigation the
authenticity of any document or instrument submitted to us as an original, the
conformity to the original of any document or instrument submitted to us as a
copy, and the genuineness of all signatures on such originals or copies.

        Based upon the foregoing, we are of the opinion that the Shares to be
offered pursuant to the Registration Statement, if sold as described in the
Registration Statement will be legally issued, fully paid and non-assessable.

        No opinion is expressed herein as to the application of state securities
or Blue Sky laws.

        We consent to the reference to our firm name in the Prospectus filed as
a part of the Registration Statement and the use of our opinion in the
Registration Statement. In giving these consents, we do not admit that we come
within the category of persons whose consent is required under Section 7 of the
Securities and Exchange Commission promulgated thereunder.

Very truly yours,



GERSTEN SAVAGE, LLP