For adults only. The elderly and individuals with conditions that may impair vitamin B-12 absorption should frequently check vitamin B-12 status when taking this product as high-dose folic acid may mask vitamin B-12 deficiency. Consult physician if pregnant/nursing, taking medication (especially phenobarbital, phenytoin, primidone, and methotrexate), or have a medical condition (especially any condition involving nutrient malabsorption). Keep out of reach of children.