Stack question — can BPC and TB500 go in the same syringe

Yes, commonly done. Both are water-soluble peptides, no precipitation when mixed. Draw BPC first, then TB500, inject. You could also pre-mix a combo vial if you're comfortable with that.

perfect thanks

Don't combine with GHK-Cu in the same syringe though — the copper can interact with other peptides and discolor the solution.

Yeah combining them is fine, done it for like 4 weeks straight. The discoloration thing mentioned above is real but that's only if you're mixing in copper peptides, which you're not. Just backload into one syringe and go, saves hassle.