However, you might actually be better off going one step back in the chain reaction and taking an L-citrulline supplement. While your body converts L-arginine to nitric oxide, it also metabolizes it too fast when the amino acid is taken in an oral supplement, according to a 2011 study from the University of Foggia in Italy. L-citrulline, which the body converts to L-arginine, is actually a better option to follow the same metabolic pathway and serve as a treatment for ED, the same study found.
Nature’s ultimate example of truth in advertising, chili peppers bring the heat. They contain capsaicin, a natural chemical that lends spicy food its pleasurable pain and has serious fat-burning and libido-revving benefits. Research has shown that it boosts testosterone and increases circulation — all good news for your erection and what you do with it. Capsaicin also boosts the release of endorphins, which in turn stimulate desire.
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.