vitamin B2
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Irritants
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Vitamins
There is no research showing this has any benefit when applied topically to skin. However, there is a small amount of research showing that riboflavin may be photosensitizing and thus cause the breakdown of skin (Sources: Free Radical Biology and Medicine, 1997, volume 22, number 7, pages 1139–1144; and Toxicology Letters, August 1985, pages 211–217).
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