Peptides are the fastest-growing category in supplements and among the most expensive. Most of what is sold has no human trial evidence at all. This takes about four minutes and tells you what the evidence actually shows for the one you are considering, whether anything in your history makes it a poor idea, and whether the foundations that make any of it work are in place.
This is an educational screening tool. It does not prescribe, it will not tell you to buy anything, and in a good number of cases the honest answer it gives is not yet, or not this one.
Nothing here is medical advice. If you are considering an injectable peptide, that is a prescribing decision for a doctor — not a supplement decision, whatever the website selling it implies.
Select any you are looking at or already taking.
These matter more than anything else on the page. Answer honestly — nothing is stored or sent anywhere.
Peptides are a refinement. If the basics are not in place they are an expensive way to avoid doing something simpler.
You should not have to take my word for it, and the same five questions work on any supplement claim, not just peptides.
1. Was it done in humans? Look for mice, rats, murine, in vitro, or a named cell line. Any of those means it was not people.
2. Was it the same form? A purified derivative is not the herb. An injectable is not the capsule.
3. Was it a dose you could take? Check the methods section against the label.
4. Was it for your situation — and did it measure an outcome or a marker? A disease model is not a wellness routine.
5. Who paid, and is the quoted number actually in the paper?
The full version, with worked examples of claims that failed — including several of my own →
And the compound-by-compound evidence review, with the current regulatory position →
Educational content, not medical advice. Peptides sold online are frequently labelled "research use only" and are not authorised as food supplements or licensed as medicines in the UK. Several are prohibited in sport by WADA. Purity and dose in unregulated products are unverified. Always tell your GP what you are taking.