Nutricost Vitamin B2 (Riboflavin) 400mg - Great for immune support Some symptoms of riboflavin deficiency may include: Fatigue Slowed growth Digestive problems Cracks and sores around the corners of the mouth Swollen magenta-colored tongue Eye fatigue Swelling and soreness of the throat Sensitivity to light LTKbeauty LTKunder50 LTKGiftGuide