L-arginine is primarily used in the treatment of cardiovascular and blood vessel conditions like congestive heart failure (CHF), chest pain, hypertension, and coronary artery disease. It is also used in the treatment of various other problems like recurring pain or discomfort in the lower extremities; blocked arteries; and decreased mental capacity in older people for example senile dementia, and conditions related to male infertility and erectile dysfunction.
Additional uses include treatment and prevention of cold, improving kidney function post transplant, pre-eclampsia or hypertension associated with pregnancy; strengthening the immune system, and in the prevention of inflammation of the digestive tract in premature babies.
Some people apply L-arginine to the skin to speed wound healing and for increasing blood flow to cold hands and feet, especially in people with diabetes. It is also used as a cream for sexual problems in both men and women.

None noted thus far.

Not recommended in people with:
Allergies or asthma;
Herpes;
Low blood pressure;
Recent heart attack;
Surgery scheduled within two weeks.

It is also not recommended in pregnant women; women planning on becoming pregnant; and nursing mothers.