I know something about injecting vit. c, since I did so on my dog. the Vit. C has to be injected slowly into the additional input on an IV while the IV is dripping into the bloodstream. Straight vit. c directly into the blood and done quickly can cause severe side effects. The Vit. C has to be a special liquid form that is made for injection. My vet ordered it for me and charged me twice the cost. I would think that if one were to inject CS, it would have to be a very purified form since injecting anything directly into the blood can cause sepsis. But then again, people who inject drugs are injecting much contamination along with their drugs.
Summer

