Keeping up with the FDA—the government agency that decides which medicines are safe—is a full-time job. Lately, they have been busy moving several popular peptides into a category called Category 2.
In plain English, this means the FDA thinks these substances pose a significant safety risk. Because of this, pharmacies that normally mix custom medications are no longer supposed to make them routinely.
The 'Not So Safe' List
If you have been looking into peptides like BPC-157, TB-500, or CJC-1295, the news isn't great. Here is what the official records show as of March 2026:
- BPC-157: Listed in Category 2 due to concerns about immunogenicity—which is when your body's immune system has an unwanted reaction to a drug. There is also a lack of safety data.
- TB-500: Also flagged for immunogenicity risks. Interestingly, the FDA notes there is no data on what happens when humans use it.
- CJC-1295: This one was removed from the list of allowed substances in September 2024. The FDA cited safety issues like an increased heart rate.
- Thymosin Alpha-1: While it is approved as a drug called Zadaxin in over 35 other countries, it is not FDA-approved here. It remains a substance of concern according to interim policies.
What About the Weight Loss Favorites?
While the FDA is worried about the safety of the peptides mentioned above, others like Semaglutide and Tirzepatide have gone through the full testing process.
In big studies, Semaglutide helped people lose 14.9% of their weight, and Tirzepatide showed even higher results at 22.5%. However, even approved drugs have safety signals. If you are taking Semaglutide, you might notice nausea or vomiting, which are listed as expected side effects.
There are some more serious things doctors are watching for with Semaglutide:
- Delayed Gastric Emptying: This is when food stays in your stomach longer than it should. It can be a problem if you need surgery.
- Pancreatitis: A painful swelling of the pancreas.
- NAION: A rare eye condition that the European Medicines Agency (EMA) started reviewing in early 2025.
The Global Confusion
Scientists are still working on this one—turns out the human body is complicated. Who knew? For example, Selank and Semax are approved drugs in Russia, but over here, the FDA has them in Category 2.
This is a great one to bring up with your doctor. You can find peptide-experienced physicians in our Find a Doctor directory.
This content is sourced exclusively from TruthTides clinical reference data and does not constitute medical advice.
Referenced Peptides
This content was generated from TruthTides clinical reference data. It does not constitute medical advice. Always consult a qualified healthcare provider.