Twinlab Male Fuel is a reliable and effective libido enhancer, that is sometimes mistaken for a prostate support formula because it shares some nutrients with typical prostate blends (saw palmetto, zinc, plant sterols). But Male Fuel is oriented toward enhancing sexual desire and response, and the formula is both effective and predictable in its effects. Male Fuel contains effective doses of both yohimbe extract for arousal and sensation and arginine for enhanced circulation. Male Fuel should not be used by men with prostate disease until they've checked with their doctor.