Are research peptides legal to buy in the US?

In most cases yes, buying and possessing a compound labeled research use only is not itself a crime, because the label means it is being sold for laboratory research rather than as a drug for a person to take. That legal gap is not the same as approval: it just means no regulator has evaluated the product for human use, and using it on yourself falls outside what the label permits.

Educational use only. This database summarizes published research and is not medical advice. Where a dose appears it is a record of what a trial or clinic ran, or what people describe doing, with its source attached. Nothing here is a recommendation for personal use.

Part of research peptides, the category. What research peptides are, legally and practically, before getting into specific compounds.