When evaluating research peptides such as Epitalon or NAD+, sourcing quality and purity are common concerns for researchers. Independent testing (for example third-party certificates of analysis) can help indicate identity and purity, though standards vary widely across suppliers. Because these compounds are sold for laboratory use, transparency about testing and handling is often used as a signal of reliability. Comparing vendors on documented quality criteria can make evaluation more systematic. This is general information, not medical advice; longevity peptides have limited human data and are not approved for human use in most countries.
Learn more: peptide vendor transparency scorecard