More Testosterone Knowledge: https://www.youtube.com/playlist?list=PLt6puIp2CPGW0tIf5L82gvkxDhaSQnME3
This playlist covers things like testosterone and other androgens, DHEA (Dehydroepiandrosterone), insulin like growth factor (igf-1, igf 1), and human growth hormone (hgh). The emphasis is understanding these hormones and ways to promote them naturally.
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Hey folks, Dr Kiel here, and I want to take a few minutes to talk about the research and evidence regarding vitamin D supplementation and testosterone. There’s a fair amount of research out there that is compelling and growing, so I took some time to summarize and condense it for your benefit.
How does vitamin D regulate testosterone? Primarily this occurs because vitamin D inhibits the process of aromatization in which testosterone is changed into estrogen. It also appears that vitamin D may enhance the sensitivity of cell receptors in the testicular glands that produce testosterone.
The best source of vitamin D is natural sunlight. However, that’s not always an option and dietary sources include fatty fish (salmon, tuna, mackerel), fish liver, beef liver, cheese, egg yolks, and fortified foods (namely, milk and breakfast cereals).
Many of these studies are looking at individuals who have a deficiency in vitamin D for one reason or another. Like most vitamins, minerals and supplements, there is almost certainly a saturation point at which the benefits subside.
Regarding testosterone, it seems relatively clear that men with low vitamin D will have an increase in testosterone when they begin supplementing. That benefit is not as obvious or well studied in men who have normal levels of vitamin D.
And on a final note, in the grand scheme of things, vitamin D supplementation has relatively few, if any major side effects when taken at the recommended daily allowance and should be part of a baseline supplement regimen for weight lifters.
Association of vitamin D status with serum androgen levels in men. Clinical Endocrinology (2010), Wehr et al.
Additive benefit of higher testosterone levels and vitamin D plus calcium supplementation in regard to fall risk reduction among older men and women. Osteoporosis International (2008), Bischoff-Ferrari et al.
Effect of vitamin D supplementation on testosterone levels in men. Hormone and Metabolic Research (2011). Pilz et al.
Supplementation with vitamin D does not increase serum testosterone levels in healthy males. Hormone and Metabolic Research (2013). Jorde et al.
Association Between Plasma 25-OH Vitamin D and Testosterone Levels in Men. Clinical Endocrinology (2012). Nimptsch et al.