When people talk about “main” anabolic steroids, they usually mean the core compounds from which many cycles are built. Testosterone (in esters such as enanthate, cypionate, or propionate) is the foundation because it is the body’s primary androgen and sets a physiological baseline. Nandrolone, commonly used as nandrolone decanoate, offers slow, steady muscle gain with less androgenic impact, so it often appears in longer bulking cycles. Dianabol represents the classic oral bulker, providing rapid strength and size but with more water retention and liver strain. Anavar is often treated as a main cutting steroid, offering a lean, cosmetic look with less bloat, making it popular with those who want visible muscle definition and performance without excessive mass.