Do research peptide vendors get their products tested for endotoxins?

Some do and publish it. Most listings do not mention it at all. Endotoxin testing checks for leftover bacterial toxins that a purity test will not catch. That matters more for something you inject than for a capsule. This site's lab profiles record which testing labs in this market offer endotoxin testing as a named test you can order. A report that only gives purity has not checked for contamination.

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 buying, vendors, and lab testing. How to evaluate a seller's claims, certificates of analysis, and pricing.