Niacin helps produce hormones related to sex. Not only that, but it can help improve blow flow, especially to the genitals. With that being said, vitamin B3 can help men who deal with sexual disorders such as impotence. Men experience erectile dysfunction for a variety of reasons from stress or fatigue to illness. However, poor circulation may also be a culprit. Consult with a medical provider about taking 250 milligrams of niacin up to three times per day.

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