Do vendors reship orders that get seized at customs?

Some do, many don't, and there's no industry standard. A reship guarantee is a vendor's marketing choice, not a customs rule. Where it's offered, it comes with conditions. Europa-Peptide, for one, requires an official customs notice as proof of seizure, then lets you pick a free reship to a new name and address or store credit. Other vendors cap it at one reship, and some say plainly that international orders ship at the buyer's risk with no replacement. The FDA regulates therapeutic peptides as drugs, and CBP seizes shipments that are unapproved or mis-declared (per the Clark & Esposito firm's writeup of a 2024 Cincinnati case where CBP took 5,000+ peptide shipments). These are research-use-only materials. Read the vendor's written policy first, and don't treat a reship promise as a guarantee it gets honored.