Injectable steroids are synthetic analogues of testosterone used in medicine and sports. The main types include testosterone (propionate, enanthate, cypionate), which promotes muscle growth. Trenbolone, one of the most powerful steroids, improves definition and strength. Nandrolone is used to increase mass with less androgenic effects. Drostanolone (Masteranone) is ideal for competitions, and stanozolol (Winstrol) helps improve endurance. Each of these steroids has its own characteristics and requires responsible use.