human 85 Humans 64 male 63 female 61 Article 58 adult 49 controlled study 46 Female 41 Male 37 vitamin D 37 Vitamin D 32 major clinical study 29 vitamin 24 middle aged 22 Adult 21 aged 21 alpha tocopherol 20 child 18 metabolism 17 Middle Aged 16 Dietary Supplements 15 Vitamin E 15 cross-sectional study 15 nonhuman 15 vitamin supplementation 15 blood 14 dietary supplement 14 drug effect 14 vitamin D deficiency 14 Aged 13