Creatine is a natural energy source for muscle contraction within the human body, deriving its name from the Greek word for meat. Approximately half of the body's supply is obtained from a meat-based diet, while the remainder is produced in the liver and kidneys before being delivered to skeletal muscles for use. Most of the body's creatine is stored within skeletal muscles and is utilized during physical activity, with small amounts also present in the brain, heart, and other tissues. Check out a legal Crazy Nutrition Ultimate CRN-5 creatine formula!