L-Arginine is suppose to help with blood flow and blood vessels. Yes it’s an amino acid and helps rebuild the protiens in the body. I’ve also gotten different info from different sources on when to take it, some say with meals while others say on an empty stomach.
I take 3g per day and have tried both ways. I use it to increase blood flow to the penis to create a better pump while exercising. Something else I read was that if you have herpes it may increase the outbreak of the virus. L-lysine which also helps rebuild tissue in the body, will help decrease herpes outbreaks.