Vitamin D is the strongest natural human steroid and has direct consequences on performance-based measures in strength, balance, motor coordination, and general physical vitality. The ability to get up when you’ve fallen down, such as an elderly person just getting out of bed, is corresponded by as much as 10% directly to your vitamin D level. Vitamin D has even shown to boost testosterone by 40% (the day following 7,000 IU) and energy levels in healthy young human subjects.

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