How do you know what to believe?

If you have spent five minutes looking up peptides online, you have probably seen a lot of big promises. The internet loves to act like everything is a miracle, but the actual science is a bit more grounded.

We are here to help you look at the facts without the fluff. Using data from TruthTides, we can see what scientists actually know about these compounds and where they are still scratching their heads.

What does a Grade A peptide look like?

When we talk about evidence, we look at clinical trials—these are the big tests where doctors give people a treatment and watch what happens. For example, semaglutide has an A+ grade because it was tested in the STEP 1 trial, where people lost an average of 14.9% of their weight.

Tirzepatide also has an A+ grade because it was shown to be even more effective in the SURMOUNT-1 trial, with 22.5% weight loss. When you see grades like this, it means there is a lot of high-quality data to back up the claims.

Are there things we still don't know?

Yes, and this is where you have to be careful with online advice. Even the best-studied peptides have "evidence gaps," which is just a fancy way of saying scientists are still working on this one. Turns out the human body is complicated. Who knew?

• Weight Regain: For semaglutide, the STEP 4 study showed that weight regain after stopping the medication is substantial.
• Side Effects: About 44% of people taking semaglutide report nausea.
• Muscle Loss: There are concerns about losing muscle mass with both semaglutide and tirzepatide.
• Ongoing Research: For tirzepatide, the long-term heart health trials are still ongoing, so we don't have all the answers yet.

Why does FDA approval matter?

Just because something is popular doesn't mean it is approved for every use. Tesamorelin is a great example. It is FDA-approved to reduce deep belly fat in people with HIV, but using it for general fat loss is considered "off-label" and lacks the highest level of evidence.

Then there is thymosin-alpha-1. It is approved in over 35 countries to help the immune system, but it is NOT FDA-approved in the US. While it has data from over 1,000 patients in hepatitis studies, the right way to use it for things like anti-aging hasn't been figured out yet.

How to take the next step

It is easy to get overwhelmed by all the technical talk about T-cells or gastric emptying. The best thing you can do is talk to a professional who knows how to read these studies.

This is a great one to bring up with your doctor. You can find peptide-experienced physicians in our Find a Doctor directory. If you are looking for a peptide therapy clinic, make sure they focus on the evidence rather than just the hype.

This content is sourced exclusively from TruthTides clinical reference data and does not constitute medical advice.