The short version: a disclaimer only works if the rest of the site agrees with it.
What the FDA said: in three warning letters dated August 24, 2026, the FDA used nearly the same words: "Despite statements on your product labeling marketing your products 'for research use only'... evidence obtained from your website establishes that your products are intended to be drugs for human use."
What outweighed the disclaimer: lines written as study results, linked research pages, a peptide guide and calculator, and bacteriostatic water sold alongside the peptides.
What has to be true for a disclaimer to hold:
- It's present where buyers decide: product pages, cart and checkout.
- Nothing else on the site contradicts it: no claims about effects in the body, no results figures, no human-use framing in articles.
- No tools or pairings point to human use.
- Who can buy is controlled.
This is not legal advice. It describes public FDA letters.
Sources: the three FDA letters: Royal Peptides LLC, NuScience Peptides LLC, Peptide Partners LLC.