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Vitamin D is found in cells throughout the body and is needed for maintenance of strong bones, immune system function, neuromuscular function, improving mood regulation, protecting the brain against toxic chemicals, and potentially reducing pain

Secondly, numerous flaws are present in study designs

Those with a deficiency may notice an increase in their level of energy after supplementation

The importance of SHBG has been discussed in TRT, SHBG & Health Facts, Questions and Evolution
