During sexual stimulation, sexual thoughts, or nocturnal erections, the neurotransmitter nitric oxide (NO) is released from the endothelial cells and the parasympathetic nerve terminal causing relaxation of two cylinder-like muscles called the corpora carvenosum. Nitric oxide influences an increase in concentrations of cyclic guanosine monophosphate (cGMP), which after numerous pathways triggers smooth muscle relaxation, and simultaneous closing of small veins traps blood in the cavernosal muscles, keeping blood in the cavernosal tissues that cause and maintain an erection.

Nitric oxide is made internally from L-arginine, which is an amino acid found in red meat, poultry, fish, and dairy products. In other words, L-arginine is the building block for nitric oxide, which is essential for erections. A lack of one can lead to a lack of the other. However, there’s a problem when it comes to treating L-arginine deficiency with supplements.
Acupuncture. Acupuncture has been used for centuries to treat ED and impotence in China. A recent review of studies on acupuncture for erectile dysfunction was published in the British Journal of Urology International. After reviewing four studies, the authors concluded that there was not sufficient evidence to say that acupuncture worked. However, some experts believe it's worth trying. "Acupuncture can work," says Gilbert. "It probably works best to treat the psychological component of ED. There is very little downside to trying it."

A study published in May 2014 in The Journal of Sexual Medicine found that some men can reverse erectile dysfunction with healthy lifestyle changes, such as exercise, weight loss, a varied diet, and good sleep. The Australian researchers also showed that even if erectile dysfunction medication is required, it's likely to be more effective if you implement these healthy lifestyle changes.
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