Frequently Asked Questions
What is a peptide?
A peptide is a short chain of amino acids (typically 2-50) that acts as a biological messenger in the body. Peptides bind to specific cell receptors and trigger particular responses, from healing and repair to appetite regulation and immune function.
Are peptides safe?
Safety depends on the specific peptide, the individual, and the context of use. FDA-approved peptides have established safety profiles from clinical trials. Research peptides have limited or no human safety data. Peptexa's star ratings measure evidence strength, NOT safety. Always consult a qualified healthcare provider before considering any peptide.
Are peptides steroids?
No. Peptides and steroids are completely different classes of compounds. Peptides are amino acid chains that signal cells. Steroids are hormones that enter cells and directly alter gene expression. Some peptides affect hormone systems (like growth hormone), but they are not steroids.
Do I need a prescription for peptides?
FDA-approved peptides (semaglutide, tirzepatide, PT-141, etc.) require a prescription. Compounded peptides require a prescription from a physician. Research peptides are sold by research chemical suppliers without a prescription but are labeled "not for human use." Dietary supplement and cosmetic peptides are available over the counter.
How do I know which peptide is right for me?
Start with your health goal. Browse the category that matches what you're looking for (weight loss, recovery, anti-aging, etc.) and compare evidence ratings. Take the [Peptide Quiz](/peptide-quiz.html) for a personalized recommendation. Then discuss your findings with a qualified healthcare provider.
What does "research peptide" mean?
"Research peptide" means the compound is not FDA-approved for human use. It may be studied in laboratory or animal research, or in early clinical trials. The label does not indicate quality, it indicates regulatory status. Always consult a healthcare provider before considering any research compound.