The email doesn't look that trustworthy, as if some privat guy can synth you PGE2. If you buy it i'd test it, but if it isn't PGE2 you cant do much about it since he accepts only crypto.
Also is the toxicity profile of PGE2 safe? You should question it before you get those chemicals systemic with a 1,5mm dermaroller
Will people please stop it w/ the toxicity worry BS? PGE2 is a naturally occurring molecule produced by your own body.