L-Ornithine is essential amino acid. It plays a fundamental role in the ornithine cycle (urea cycle), functioning in a combination with arginine and citrulline, in ammonia ejection from the organism, which is a secondary product of the protein metabolism. Thus it detoxifies the body, improves the functions of the immune system and helps with muscle recovery after an intensive workout. It also helps in growth hormone release, increase of muscle mass and optimization of the energy levels in the organism. It can be found mainly in animal products (meat, dairy products, fish) and the easiest way to supply with enough quantity of it is through supplementation. It is recommended for intensive muscle building workouts.