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Conception and vitamin D

Information from end of VitaminDWiki page: Pregnancy

Following is a snapshot as of Sept 2012

Help getting pregnant
Vitamin D increases fertility of BOTH the man and the woman.

Each 1 ng increase in blood level of vitamin D increases clinical pregnancy by 6%
You may not have heard much about it since it has been patented
   see also Who said vitamin D could not be patented
Vitamin D has been used by zoos and vets for a long time to improve birth rate