Phillip MD Frost Et Al SC 13D/A ChromaDex Corp.

Exhibit 99.1

AGREEMENT TO FILE JOINT SCHEDULE 13D

Pursuant to Rule 13d-1(k)(1) under the Securities Exchange Act of 1934, as amended, the undersigned hereby consent to the joint filing on their behalf of a single Schedule 13D and any amendments thereto, with respect to the beneficial ownership by each of the undersigned of shares of the common stock of ChromaDex Corporation, a Delaware corporation.  The undersigned hereby further agree that this statement may be executed in any number of counterparts, each of which when so executed shall be deemed to be an original, but all of which counterparts shall together constitute one and the same instrument.

Dated: December 29, 2017	By:	/s/ Phillip Frost, M.D.
		Phillip Frost, M.D.

Dated: December 29, 2017	FROST GAMMA INVESTMENTS TRUST
	By:	/s/ Phillip Frost, M.D.
		Phillip Frost, M.D., Trustee

Dated: December 29, 2017	PHILLIP AND PATRICIA FROST PHILANTHROPIC FOUNDATION, INC.
	By:	/s/ Phillip Frost, M.D.
		Phillip Frost, M.D., President