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The healthy and legal way to grow muscle is by doing body building at Gym and you may take creatinine
supplements if not contraindicated for you. Eat high protein diet like pulses, eggs, chicken, lean meat. Eat fresh fruits and green leafy vegetables. Avoid junk food, fatty food, colas. Drink plenty of water especially if you take creatinine. Any kind of injection can be harmful to your body so please avoid thinking of that.