Creatine

Yes!!! You should take 5g of creatine to gain muscle mass in body building and also for athletes, wrestlers and sprinters. Following are the reasons why creatine supplementation is beneficial:
↪ increases ATP in muscles
↪ maintain training intensity
↪ improves quality of workouts
↪ produced endogenously in body
↪ gives more energy

Remember creatine is not a steroid, it is totally different and works in a different manner.