Like its close relative vitamin B-12, vitamin B-3 -- also known as Niacin -- is remarkably important to men's health. It's found in the same good-for-you foods we tend to avoid, like whole wheat, almonds and seeds. But if you avoid this vitamin, do it at your own peril, as it's essential for fueling your body throughout the day [source: UMMC].
The biggest strength of niacin is its link to lowering blood cholesterol. Lower cholesterol means you'll have less of a chance of suffering a stroke, heart attack or cardiovascular disease [source: Science Daily]. Vitamin B-3 can also help decrease the likelihood of skin problems because B vitamins are necessary for healthy skin, hair, eyes and liver. There have even been studies linking hair loss with niacin deficiency, but no conclusive evidence has been found.
If you regularly eat protein-rich foods, especially whole wheat, you should be getting the necessary amounts of this vitamin. However, if you avoid whole grains and almonds, you may want to consider supplementing your diet. Be careful though, excess amounts can lead to flushed skin, rashes and even liver damage.
Next up, the eyesight vitamin.