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"Women with fertility problems may benefit from taking vitamin D supplements, research has found. A study has found a link between low levels of Vitamin D and problems with ovulation. The research may offer a simple, cheap and safe option for women to try before resorting to drugs."

In 1939, Dr. Abraham Myerson measured initial levels of circulating testosterone in men and exposed their various body parts to UVB light. After five days of chest exposure sufficient to cause reddening, circulating testosterone increased by 120%. After eight days without additional UV exposure, testosterone returned to initial levels. When the genital area was exposed, testosterone levels increased by 200%!

Relationship between low ultraviolet B irradiance and higher breast cancer risk in 107 countries. Mohr SB, Garland CF, Gorham ED, Grant WB, Garland FC. Breast J. 2008 May-Jun;14(3):255-60. Epub 2008 Apr 17. PMID: 18422861 DOI: 10.1111/j.1524-4741.2008.00571.x There was a protective effect of UVB irradiance on risk of breast cancer that was independent of fertility rate, proportion of the population overweight, alcohol intake, animal energy intake, and other covariates.