There’s no definitive answer because large scale, double blind, placebo controlled trials have not been conducted with various herbal supplements. That said, there is some reasoning behind the use of some herbal supplements and better erection health. According to the Mayo Clinic, two of the supplements that may help and that are generally considered safe include:
• L-arginine, which is believed to stimulate blood vessels to open wider for better blood flow
• Panax ginseng, which, in one study, showed improved sexual function in men with erectile dysfunction.
Supplements, just like conventional drugs, have side effects too. Common side effects of L-arginine may include nausea, diarrhea, and stomach cramps. And you should not take L-arginine if you take Viagra, because of the possibility of dangerous interaction between the two. Likewise Panax ginseng is believed to be safe when used on a short-term basis, but in some men it causes insomnia.
Some supplements and teas can help with erection health, but they’re not a cure for erectile dysfunction.
Ginkgo biloba is another supplement that is believed to improve blood flow, but scientific evidence of this is limited, so there’s no real consensus. It is known, however, that ginkgo can increase risk of bleeding, and people who take blood thinners like Coumadin should not take ginkgo biloba.