Start with the problem, not the peptide.

Peptides are short chains of amino acids — the same building blocks as proteins, just smaller. Some are natural signalling molecules the body already produces; others are synthetic copies, fragments or analogs of those molecules made for research or, in a small number of cases, approved as prescription medicines.

Not all "evidence" is the same kind of evidence. A mechanism studied in a petri dish, a result seen in mice, a small early-phase human trial and a large regulator-reviewed trial are four very different levels of confidence — and marketing copy rarely tells you which one you're looking at. PepAdvice tries to keep those levels visible rather than flattening them into one confident-sounding claim.

Sleep, nutrition, training and stress all influence the same systems that most discussed peptides claim to target. Ignoring the fundamentals before adding a compound makes it hard to know what's actually responsible for any change — good or bad.

A handful of peptides are approved prescription medicines with a defined dose, indication and safety monitoring. Most peptides discussed online are not — they're investigational, sold "for research use," with human safety and efficacy data that ranges from limited to nonexistent. PepAdvice tries to be explicit about which is which for every entry in the Reference library.

We start with the goal, not the compound. We separate mechanism from outcome, and human data from animal data. We say "we don't know" when that's the honest answer. Nothing here is personalised medical advice, and nothing here recommends a specific dose.