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I can confirm this to be true. I get my testosterone checked regularly along with my TSH numbers. For some reason my TSH is never a consistent number and my testosterone levels have been in the crapper for a long time. Even with testosterone supplements my levels didn’t improve much, if at all. Last July my doctor said my PSA numbers were a bit high so he told me to stop taking the Andriol, the testosterone supplement. Fast forward to December when I started taking 2000 IU of vitamin D per day. I had my blood tested again a few weeks ago at the end of February and my doctor said my testosterone levels were higher than they’ve been over the last few years while taking supplements.
Vitamin D deficiency is common in the UK, probably due to lifestyle changes and increased concern about sun exposure. If you have too little vitamin D you are unable to maintain an adequate concentration of calcium in your blood for bone growth. This causes rickets in children and osteomalacia in adults. As the role of vitamin D as a regulator of other functions throughout the body has emerged, it has been suggested that a lack of vitamin D is linked to an inability to fight infections effectively, the development of diabetes , certain cancers, multiple sclerosis, depression , heart disease, high blood pressure, and stroke, although the direct relevance and mechanisms underlying these responses remain unknown.