<p>Researchers tested the quality of sperm from 300 men chosen at random and carried out a detailed analysis of samples from a further 40 in the laboratory, the daily said.<br /><br />At the same time, the level of vitamin D in their blood was measured. Almost half had an insufficient amount - linked to lack of exposure to natural sunlight or time in a solarium.<br /><br />Sunlight is the major source of vitamin D, which helps regulate levels of calcium and phosphorus to generate healthy bones.<br /><br />The findings, published in the journal Human Reproduction, back up previous research linking vitamin D to sperm production, and might explain why many couples seem to conceive on holiday.<br /><br />Researchers discovered that almost half of the participants had an insufficient amount of vitamin D, below 50 nmol/l. The optimum level recommended by most experts is a minimum of 75 nmol/l, according to the newspaper.</p>
<p>Researchers tested the quality of sperm from 300 men chosen at random and carried out a detailed analysis of samples from a further 40 in the laboratory, the daily said.<br /><br />At the same time, the level of vitamin D in their blood was measured. Almost half had an insufficient amount - linked to lack of exposure to natural sunlight or time in a solarium.<br /><br />Sunlight is the major source of vitamin D, which helps regulate levels of calcium and phosphorus to generate healthy bones.<br /><br />The findings, published in the journal Human Reproduction, back up previous research linking vitamin D to sperm production, and might explain why many couples seem to conceive on holiday.<br /><br />Researchers discovered that almost half of the participants had an insufficient amount of vitamin D, below 50 nmol/l. The optimum level recommended by most experts is a minimum of 75 nmol/l, according to the newspaper.</p>