L-arginine is an amino acid that is necessary for the lining of the blood vessels to produce nitric oxide. Nitric oxide allows the blood vessels to relax, thus improving blood flow throughout the body, including to the penis. Studies on L-arginine and erectile dysfunction have used between 2,000-5,000 mg a day in divided doses.ii Supplemental arginine is best taken on an empty stomach.3
As men age, their estrogen levels gradually rise, while testosterone levels fall. Anti-cancer coupounds called indoles can help strike a balance. Cruciferous vegetables like broccoli are rich in indoles, which boost testosterone production by breaking down and flushing the system of excess estrogen, which inhibits the production of male sex hormones. In one study, supplementing with indole-3-carbinol from cruciferous vegetables for just 7 days cut the estrogen hormone estradiol in half for men. Another study found indole supplementation significantly increased urinary excretion of estrogens.
Ginkgo biloba. Known primarily as a treatment for cognitive decline, ginkgo has also been used to treat erectile dysfunction -- especially cases caused by the use of certain antidepressant medications. But the evidence isn't very convincing. One 1998 study published in the Journal of Sex & Marital Therapy found that it did work. But a more rigorous study, published in Human Pharmacology in 2002, failed to replicate this finding. "Ginkgo has come out of fashion in the past few years," says Ronald Tamler, MD, assistant professor of medicine and codirector of the men's health program at Mount Sinai Medical Center in New York City. "That's because it doesn't do much. I can say that in my practice, I have not seen ginkgo work -- ever."
Erectile dysfunction can occur for various reasons. A health condition, an emotional or relationship problem, a certain medication, smoking, drugs, and alcohol all have the potential to cause ED. Some people want a quick fix, so they rush to their doctor hoping to get medication, not knowing that there are natural home remedies for erectile dysfunction.
Derived from the bark of a West African evergreen tree, yohimbe was the go-to ‘script for a wonky willy prior to the advent of wonder drugs like Viagra, Walker says. “Yohimbe enhances sexual performance both by blocking certain neurotransmitters in the brain and by increasing the release of nitric oxide in the cavernosal nerves of the penis,” he explains. And it pairs well with other erection-friendly tablets: A 2010 study in the Iranian Journal of Psychiatry found that a combination of yohimbe and L-arginine successfully helps guys get it up. However, yohimbe also has a handful of side effects, including elevated blood pressure and anxiety, so definitely talk to your doctor before you start on the supp.
In one study, men with a Vitamin D deficiency were nearly 33% more likely to have ED. But you don’t need that much sun exposure to get a healthy amount of Vitamin D. As little as 15–20 minutes a day is enough. Taking Vitamin D is a good idea, especially if you are over 65. Vitamin D can also help if you’re obese or dark-skinned (dark skin limits the amount of Vitamin D you naturally, produce)
Consider this: penicillin, the first successful antibiotic, was derived from molds that inhibit bacterial growth. Scientists had to figure out why the molds slowed bacteria, and refine the active ingredients. Using herbal supplements is somewhat like putting mold on a wound. It might help, a little, but it’s certainly not going to help as much as using penicillin.
Ginseng, specifically “red ginseng,” is known as the “herbal Viagra” that helps puts to rest men’s bedroom woes. Red ginseng is when the root has been steamed and then dried. The ginseng root is the part of the plant that is mostly used as a natural remedy when in its supplement form. However, the plant must be grown for a minimum of five years before it can be used. In a 2008 review, seven studies on red ginseng and ED, ranging in dosages from 600 to 1,000 milligrams three times a day, were found to provide evidence for the effectiveness of the herb in ED treatment.
Some scholarly minds believe it wasn’t an apple, but a pomegranate with which Eve tempted Adam in the Garden of Eden. She was smart: A recent study published in the International Journal of Impotence Research discovered that pomegranate juice, rich in antioxidants that support blood flow, can help improve erectile dysfunction. Though this study was funded by POM Wonderful, animal studies have also shown that the elixir improves long-term erectile response, so it’s definitely worth a shot–literally. Knock a shot back or water your juice down a bit: One cup of tart POM Wonderful packs 31 grams of sugar.
When considering vitamin supplementation for erectile dysfunction, one of the first vitamins that you may come across in literature would be Vitamin D. This is a vitamin that can be easily obtained through many types of dairy products like milk, cheese, and yogurt and is also in abundance if you live in a tropical climate. Sunlight is able to give us a natural dose of vitamin D daily.  Although vitamin D is usually associated with improving bone strength and prevention osteoporosis, another valuable feat of vitamin D is the fact that it helps reduce atherosclerosis. Studies confirm that there is a similar underlying mechanism that occurs between conditions like cardiovascular disease and erectile dysfunction. As blood vessels are damaged and filled with plaques, the diameter for blood to flow through is gradually reduced. After a few years, the amount of blood may be reduced substantially. Vitamin D is able to help activate cells that remove some of these dangerous plaques and delay the onset of ED. 
A number of nonprescription products claim to be herbal forms of Viagra. Some of these products contain unknown amounts of ingredients similar to those in prescription medications, which can cause dangerous side effects. Some actually contain the real drug, which should be given by prescription only. Although the Food and Drug Administration has banned many of these products, some potentially dangerous erectile dysfunction remedies remain on the market.