Studies have found nitric oxide to be extremely effective in improving the sexual performance of normal males. Erection in men is caused due to increase in supply of blood into their penis. Nitric oxide plays an important role in vasodilatation which is required for erection of penis. Nitric oxide has combination of a nitrogen atom and an oxygen atom. Nitric oxide is the result when L-arginine converts into L-citrulline through action of group of enzyme called Nitric Oxide Synthase.

Studies have shown that daily intake of L-arginine have been beneficial for sexual health in the following ways:

1. It brings an increase in sexual desire.

2. Brings an improvement in the sexual performance of the person and increases the stamina. Nitric oxide has shown increase in the flow of blood in the genital tissue at a rate which is twice the value of regular rate.

3. It also leads to secretion of human growth hormone and helps in increasing their lean muscle mass. Because of the enhanced production of human growth hormone, improvement is seen in libido, which is followed by muscular growth.