I've had a vial in sitting there for 5 days now & the powder has barely dissolved. if you shake it, it looks like those snow falling onto a city in a crystal ball toys. Having used Serno, Jins, Kexing, Blue tops etc, I've never seen GH powder not dissolve. The pro peptide guys are super nice guys with great customer care & this is probably the manufacturers fault & not theirs. The old Soma kits were the best kits I'd ever used next to Sernos. They blew Jins away.