<prompt> tafadhali geuza maudhui haya ya swahili kwenda kwa kiingereza.utafiti unaonyesha kuwa viwango duni vya folate vitamini b9 vinaunganishwa na hesabu ndogo ya manii na kupungua kwa uhamaji wa manii.  <response>: in men, research shows that poor levels of folate vitamin b9 are linked to a low sperm count and decreased sperm mobility. 