biotin
... that biotin has been proven to benefit hoof health in cattle and horses, but evidence for human nail health is very weak?
... that <b id="mwCfI"><a href="./Biotin" id="mwCfM" rel="mw:WikiLink" title="Biotin">biotin</a></b> has been proven to benefit hoof health in cattle and horses, but evidence for human nail health is very weak?