250 Grams of Pure Vitamin B3 (Niacin) Powder Per Bottle Warning: Will Likely Cause "Niacin Flush." For Non-Flush, try Niacinamide Consuming On An Empty Stomach May Increase Flush Reaction Non-GMO, Gluten Free, 3rd Party Tested Made in A GMP Compliant,... 250 Grams of Pure Vitamin B3 (Niacin) Powder Per Bottle Warning: Will Likely Cause "Niacin Flush." For Non-Flush, try Niacinamide Consuming On An Empty Stomach May Increase Flush Reaction Non-GMO, Gluten Free, 3rd Party Tested Made in A GMP Compliant, FDA Registered Facility