L-arginine acts as a vasodilator, opening (dilating) blood vessels, many people take oral L-arginine to treat heart conditions and erectile dysfunction.
 
 L-Citrulline:
Increased exercise capacity. ...
Increased blood flow. ...
Decreased blood pressure. ...
Improved cardiac function and erectile dysfunction. ...
Enhanced cognition & brain performance. ...
Boosted immunity.
 
 L-Ornithine reportedly yields wide ranging health benefits, including growth hormone secretion, improved sleep quality and enhanced skin strength and wound healing
 
D-Methionine
It may also act as an antioxidant and help to protect damaged tissues. People use methionine for preventing birth defects. It is also used for liver disorders, viral infections, breast cancer
 
B12
B3