Ingredient Evidence

L-arginine is an amino acid studied for possible effects on blood pressure and other health outcomes. Human studies are small to moderate in size. They show a modest blood pressure drop in a handful …

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L-citrulline is an amino acid your body makes on its own and that is also found in watermelon. Human studies point to a modest drop in blood pressure in middle-aged and older adults, a small and …

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Niacin (vitamin B3) is an essential nutrient, and most people in the United States already get more than they need from food. At very high supplement doses, nicotinic acid improves cholesterol and …

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Vitamin E is a group of eight fat-soluble compounds, and only alpha-tocopherol meets human requirements. The amounts in food are well tolerated. In large trials, vitamin E supplements did not prevent …

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Ginger is the underground stem (rhizome) of Zingiber officinale, used as food and as a supplement. Human studies are strongest for nausea in pregnancy and look promising but weaker for menstrual …

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L-carnitine is a compound your body makes and also gets from food, especially red meat, and it helps move fatty acids into your cells' energy-producing mitochondria. Human studies show small to …

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