L-Arginin from Solaray is a supplement that is obtained by a natural process of microbiological fermentation and is an essential component of the proteins present in the body. L-Arginin from Solaray contributes to the growth of muscle mass, since it can stimulate production of growth hormone, which is essential for losing fat and gaining muscle, is essential for the metabolism of muscles because it acts as a vehicle for the transport, storage and elimination of nitrogen. It converts ammonia, whose level increases during physical exercise, into urea to be eliminated from the body. It is recommended to take one vegetable capsule three times a day, preferably without meals. L-Arginine is possibly safe for most people except pregnant and lactating. It can produce some side effects such as: abdominal pain, bloating, diarrhea, allergies, inflammation of the respiratory tract, worsening of asthma, hypotension.