Next Cycle: Deca, Dbol, Test, Mast Pharma TRT Below is an overview of the main categories of performance‑enhancing substances that are commonly found in bodybuilding and fitness circles. The list is meant purely for educational purposes, to give you a sense of what each type of compound does in terms of muscle growth, recovery or body composition. It is **not** a guide on how to obtain or use these drugs, nor is it an endorsement of illegal activity. | Category | What it |