Maca is an Andean root. A few small trials suggest possible improvements in sexual desire, but the trials are short and small.
Ashwagandha is best studied for stress and sleep. Some trials report effects on sexual function or testosterone, but results are inconsistent. It may affect thyroid hormones and, in rare cases, the liver.
Tongkat Ali has small trials on testosterone, stress and mood with mixed results. Product quality and doses vary widely.
Low drive and erection problems can be linked to heart disease, diabetes, low testosterone, poor sleep, stress, alcohol and medicines. See your doctor. Read how we review a product that uses these herbs: Spartamax.
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