25% of peptides sold online contain undisclosed ingredients

Last week, I shared my thoughts and concerns about the peptide industry.

Now, a JAMA analysis of peptides purchased online found that 25% of them contained compounds not listed on the label. No regulatory agency is required to sign off on these products before they hit the market.

Many are sold as research chemicals with fine print disclaimers like not for human consumption, while being openly marketed for injection into humans.

The FDA has flagged dozens of popular peptides, including BPC-157 and TB-500, as posing potential serious safety risks. Both are banned by international sports authorities as doping substances.

Patients are paying up to 500$/month for products that may contain unknown ingredients, wrong doses, or outright contaminants.

CNN has conducted an investigation into this:

https://www.cnn.com/2026/04/13/health/peptides-what-to-know-wellness?variation=B&tw_source=Klaviyo&tw_profile_id=01HRA9DPF9VT9QVVMAK0HC736D&tw_medium=campaign

And Dr. Paul is going into more depth on this topic:

https://www.youtube.com/watch?v=LsfLAI6qBzY

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