Opti gh that I stored in the fridge for 5 years and re-tested showed zero dimer still, mg didn't decrease and purity dropped about 3.5%. Some or most of that purity decrease could have been from Jano changing his gh test method to a more stringent one in early 2021.
Fridge is absolutely fine...
WG has been around for a very long time and the most reliable source for real serostim. Definitely jump on it if he's got stock and accepting new customers. He's probably the most solid source I've dealt with over the years and there's zero doubt about the authenticity of what he carries.
The powder (puck) you see in there is almost all mannitol and is pretty much the same size for all gh and peptides. You'd be shocked if you saw what the 9.××mg of gh looks like in those vials if there wasn't any filler. It pretty much looks like an empty vial.
Basically, the size of the puck...