lmk if this needs marked nsfw personally i think it’s fine but i yield to the discretion of others :)
I feel like synthetic taurine is a lot less available than actual pig liver, since the latter is an underused byproduct of a massive industry. I would be happy if I were wrong.
Synthetic taurine is everywhere, just search Amazon. It’s sold alongside vitamins.
Finding a good source for most of it being vegan is hard, the best I’ve found so far is Healthline claiming “The form of taurine used in supplements and energy drinks is usually synthetic, meaning it’s not derived from animals.”
And Monster energy is definitely synthetic taurine according to their faq.