Bodybuilding supplements are products used to help increase muscle mass, improve recovery, boost training performance and provide the nutrients athletes need. The most common include whey protein, creatine, branched-chain amino acids (BCAAs), mass gainers and pre-workout supplements. They are usually taken alongside a regular training program and a suitable diet to speed up muscle building and strength gains. However, their use should match your goal, body weight and individual circumstances, and is best done under the supervision of a coach or nutritionist to avoid possible side effects and overuse.