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Can vitamin D increase testosterone concentrations in men?
Study details
Two hundred HIV-negative overweight and otherwise healthy people were recruited for the weight loss study. As part of the program, participants were educated about nutrition and healthy eating habits and received weekly counselling via telephone with a nutritionist for the first six months of the study. Half of the participants received vitamin D3 at a dose of 3,333 IU/day for 12 consecutive months, while the other half received placebo. Among a subset of 54 men—31 received vitamin D and 23 received placebo—extensive laboratory assessments of testosterone were performed. This report focuses on the 54 men.
The average age of the men was 48 years and half of them smoked tobacco. Vitamin D levels prior to randomization were suggestive of deficiency, about 30 nmol/litre.
Results
The men lost an average of 6 kg over the course of a year.
The men who received vitamin D had their levels rise to 86 nmol/litre.
Before we can present further results on testosterone, some background information is necessary
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Effect of vitamin D supplementation on testosterone levels in men.
By contrast, there was no significant change in any testosterone measure in the placebo group. Our results suggest that vitamin D supplementation might increase testosterone levels. Further randomized controlled trials are warranted to confirm this hypothesis.