Injectable steroids are overall safest and in the most occasions without any risk of liver damage. Take care of product information and your health status, because some of products share chemical basis with oral steroids (such as stanozolol) and share not only results, but also risks.
Main results of injectable steroids come from testosterone esters, which is produced as a reaction of fatty acids and alcohols, depending of choosen product. Esterification makes testosterone effective even before being absorbed by livers.
Most of injectable steroids is applied intramuscularly. Direct uses is important for active substances reach muscles before livers. These esters are having longer effect and are safer then alpha-acrylic steroids.