Exhibit 23.1
Consent of Independent Registered Public Accounting Firm
We consent to the reference to our firm under the caption "Experts" in this Registration Statement (Form S-3) and related Prospectus of Flex Pharma, Inc. for the registration of common stock, preferred stock, debt securities and warrants and to the incorporation by reference therein of our report dated March 6, 2019, with respect to the consolidated financial statements of Flex Pharma, Inc. included in its Annual Report (Form 10-K) for the year ended December 31, 2018, filed with the Securities and Exchange Commission.
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| /s/ Ernst & Young LLP | | |
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| Boston, Massachusetts | | |
| April 24, 2019 | | |
