Some men exhibit sparse hair growth.
Facial-hair growth occurs most frequently in men. The trait results from sexual dimorphism between men and women. Not all men grow facial hair, however, and some men only exhibit sparse facial-hair growth. The number of hair follicles on the face does not increase with vitamin usage, but certain vitamins do increase the thickness and growth rate of hair.
Vitamins A and C
Vitamins A and C promote the production of sebum. The body's sebum lubricates and moisturizes hair, causing the hair to appear more lush and thick. Foods such as spinach and chard contain substantial amounts of vitamins A and C. Vitamin C is water-soluble, but the body stores fat-soluble vitamin A. Be aware when taking supplements that consumption of excessive vitamin A may cause hair loss, according to WebMD.
Vitamin B12
Hair requires vitamin B12 for healthy growth. The body does not store vitamin B12 because the vitamin is water-soluble. The body evacuates excess B12 through the urine. Vitamin B12 benefits the user most when a small amount is taken frequently. Foods rich in B12 include beef, milk, cheese and wheat germ.
Biotin
Biotin, another water-soluble B vitamin, acts as a major building-block in hair composition. Doctors even recommend biotin supplements or biotin-rich diets to patients suffering from hair loss. Foods containing high amounts of biotin include eggs and legumes.
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