It looks like it lowers levels of folic acid, which is vitamin B9: http://pennstatehershey.adam.com/content.aspx?productId=107&pid=33&gid=000338 http://pennstat

It looks like it lowers levels of folic acid, which is vitamin B9: http://pennstatehershey.adam.com/content.aspx?productId=107&pid=33&gid=000338 http://pennstatehershey.adam.com/content.aspx?productId=107&.... Looking at the other articles for B vitamins on ADAM, it seems that only folic acid is affected.