Fact Check: Peptides were banned in the United States in 2023, leading to a gray market where they are sold for ...

Claim: Peptides were banned in the United States in 2023, leading to a gray market where they are sold for research use only.

Verdict: Correct (85% confidence)

Explanation: According to ProPublica, the FDA categorized 19 peptides as too unsafe for compounders in 2023, effectively banning them (ProPublica). JAMA Network confirms that this led to a gray market where peptides are sold with labels such as 'for research purposes only' (JAMA Network). These sources directly support the claim that the 2023 ban resulted in a gray market for peptides marketed for research use only. The evidence from these credible sources supports the claim's core proposition.