Amazon.com: Vitamin B2 (Riboflavin) Drops, B Vitamin Liquid to Support Digestion, Blood Cells & Nervous System, Liquid Vitamins for Hair, Skin and Nails, Alcohol-Free, Non-GMO Riboflavin Extract, 1 Fl Oz. : Health
Dietary Reference Intakes for Thiamin, Riboflavin, Niacin, Vitamin B6, Folate, Vitamin B12, Pantothenic Acid, Biotin, and Choline | The National Academies Press
Vitamin B-2 | 100 mg Riboflavin | Energy & Vision Health