Boston Therapeutics Inc. 303 East Wacker Drive, Suite 1040 Chicago, Illinois 60601

Exhibit 4.1

Boston Therapeutics Inc.

000 Xxxx Xxxxxx Xxxxx, Xxxxx 0000

Xxxxxxx, Xxxxxxxx 00000

                                                                                                                   October 23, 2015

CJY Holdings Limited

00 Xxxxxxx Xxx Xxxx

Xxxxxxx Xxx, Xxxx Xxxx

Re: Securities Purchase Agreement dated September 24, 2015 (the “SPA”) by and between Boston Therapeutics Inc. and CJY Holdings Limited

Gentlemen:

Reference is hereby made to the SPA.  By executing this letter, the undersigned investor agrees that the offering amount shall be increased from $750,000 to $1,050,000.  Accordingly, it is hereby agreed to by the parties that Section 1(d) of the Agreement shall be amended and restated to state the following:

"d.           Subsequent Financing.  The Note is intended  to provide necessary bridge financing to the Company prior to an anticipated financing in the near future of an amount up to $1,050,000 which is expected to be structured as convertible preferred stock (the "Preferred Financing").  Upon the closing of the Preferred Financing, the Note shall automatically convert into the Preferred Financing."

We kindly request that you execute this letter below indicating that you agree with the above amendment.

Sincerely,

Boston Therapeutics Inc.

By: /s/Xxxxx Xxxxx                 

Name: Xxxxx Xxxxx

Title: CEO and Director

AGREED AND ACKNOWLEDGED:

CJY Holdings Limited

By: /s/Xxxxx Xxx Him              

Name: Xxxxx Xxx Him

Title: