Arginine affects a wide variety of hormonal functions, such as stimulating the pituitary gland to produce growth hormone (GH), which promotes muscle growth, increases strength, enhances tendons and ligaments, reduces fat, and boosts metabolism, resulting in increased energy.
Ornithine and lysine, in combination with arginine, enhance this effect by promoting increased endurance and lean body mass and reducing muscle and fat mass catabolism during intense weight training.
D-aspartic acid increases the production of LH from the pituitary gland, allowing for increased testosterone in the testes through the stimulation of Leydig cells. Recent research shows that the combination of dry extracts of tribulus terrestris and fenugreek (Greek hay) can increase the rate of LH (luteinizing hormone) and testosterone in men and an increase in female hormones associated with the rate of FSH.
Zinc is particularly important for athletes because it promotes the growth and repair of muscle tissue during recovery stages from training.