Well, chemists add an ester chain to the parent drug to prolong its release into your bloodstream, so you can do more infrequent shots. Basically IP's have no ester, so shoot ED and remember, no ester means no added weight, so 50 mgs is really 50!! What i mean by that is a long ester, like cypionate, will have aded weight, so when you see 200 mgs per cc, theres really about 165 mgs of actual test percc. IPs shit should be really strong, but were not even talking vet quality here, so watch out.