What's the interest rate on this account? prevacid otc dosage for infants "Based on our results, the ability of vitamin B to reduce stroke risk may be influenced by a number of other factors such as the body's absorption rate, the amount of folic acid or vitamin B12 concentration in the blood, and whether a person has kidney disease or high blood pressure," Yuming said. "Before you begin taking any supplements, you should always talk to your doctor."