Yes MC stands for MuscleChemistry and funny thing is I've been waiting for this question for years now lol, as I always wondered if people thought what the hell is
"MC IGF-1 lr3" and maybe thought it was some sort of Mito Chondrial IGF lmao or thought MC stood for something else, so yeah been waiting for many many years for someone to ask that and You my friend are the very first, so not a dumb question in my humble opinion.
and as big mills said, loads of information here on it, and he did not mean to be rude as he said, he is knowledgable brutha here, so hope ya didnt take it the wrong way daddio!
and it comes in AA solution meaning Acetic Acid solution which is what keeps this particular product stable and viable for many many months, as water be it Bacteriostatic or sterile both degrade this peptide fast.