If you're talking the vet B-complex, I've used it. Don't know if it helped or not, but it helps cut the pain of high-BA AAS. Leaves a nasty vitamin taste in your mouth after injection and smells like ass though! My whole closet smelled! I am going to run it through a syringe filter and use it again next cycle. I would prefer human B-12 but it's more expensive and a pain in the ass because it comes in amps. Hope that helps.