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Ad Brand, spokesman of the Sunlight Research Forum in Veldhoven in the Netherlands, said: 'Men who ensure their body is at least sufficiently supplied with vitamin D are doing good for their testosterone levels and their libido among other things.' The new findings back up previous research that found an hour of sunshine can boost a man's testosterone by 69 per cent.
Testosterone is the most important male sexual hormone.
The vital nutrient is produced in the body after exposure to sunlight and can also be obtained from eating oily fish and meat.
Researchers at the Medical University of Graz in Austria found men with at least 30 nanograms of vitamin D per millilitre of blood had much more of the main male sexual hormone circulating than those with less.