NOW Foods Flush-Free Niacin Double Strength is a high-potency formula of Niacin. Niacin (Vitamin B-3) is an essential B-vitamin necessary for good health. Many Niacin supplements cause a temporary Niacin flush or tingling red rash on the skin when taken in large doses. This flush-free Niacin is formulated to avoid such reactions.Directions: Adult Dosage: Take 1 capsule daily with meals. Avoid taking with hot drinks.  Caution: Consult a health care practitioner prior to use if you suffer from any of the following: impaired liver function, kidney disease, diabetes, gallbladder disease, gout, peptic ulcer disease, or if you are taking any of the following medications: blood thinners, anticoagulant/antiplatetlets, antidiabetics, statins or transdermal nicotine. Do not use if you are pregnant or breastfeeding.