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2. The Best Supplements for Men Over 50, According to ... - AOL

   www.aol.com/best-supplements-men-over-50...

   Zinc and vitamin D are also essential for bone health but have the added benefit for men over 50 by reducing the risk of erectile dysfunction, a condition commonly affecting men over age 40 ...

3. 12 Best Vitamins for Hair Growth - AOL

   www.aol.com/12-best-vitamins-hair-growth...

   The best vitamins, minerals and nutrients for hair growth include vitamin A, vitamin B12, folic acid, vitamin C, vitamin D, vitamin E, biotin, zinc, iron, protein, keratin and omega-3 fatty acids.

4. Can a Vitamin D Deficiency Cause Hair Loss? - AOL

   www.aol.com/vitamin-d-deficiency-cause-hair...

   Beyond just vitamin D there are other vitamin deficiencies that cause hair loss as well. For instance, vitamin B deficiency hair loss is also possible. Vitamin D and Hair Loss: Key Info. Vitamin D ...

5. Vitamin D - Wikipedia

   en.wikipedia.org/wiki/Vitamin_D

   Unlike the other twelve vitamins, vitamin D is only conditionally essential - in a preindustrial society people had adequate exposure to sunlight and the vitamin was a hormone, as the primary natural source of vitamin D was the synthesis of cholecalciferol in the lower layers of the skin's epidermis, triggered by a photochemical reaction with ...

6. The 14 Best Hair Growth Vitamins for Longer, Stronger Hair - AOL

   www.aol.com/16-best-hair-growth-vitamins...

   Key ingredients: Vitamins A, C, D3, E, B1, B2, B3, B5, B6, B12, iodine, kelp powder. ... Healthy Hair Vitamins. Over 12,500 Amazon customers are raving about these supplements, which complement ...

7. Cholecalciferol - Wikipedia

   en.wikipedia.org/wiki/Cholecalciferol

   The Institute of Medicine in 2010 recommended a maximum uptake of vitamin D of 4000 IU/d, finding that the dose for lowest observed adverse effect level is 40,000 IU daily for at least 12 weeks, [25] and that there was a single case of toxicity above 10 000 IU after more than seven years of daily intake; this case of toxicity occurred in ...