
Originally Posted by
Gallowmere
I’ve had this happen with numerous vials of different compounds. So long as it’s still completely transparent (no clouding, particulates, etc.) I don’t worry about it. Most of these hormones and their esters will oxidize a bit in solution over time. Hell, that’s why Tren is often a darker yellow than anything else, because it has a higher rate of oxidation.
If you look at any medical description text for stuff like this, they give appearance as “clear to faint yellow” to account for this fact. I’ve had pharma stuff from the same lot, still sealed with differences in hue straight off of the shelf.