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For example, riboflavin has been shown to be involved in the conversion of tryptophan to niacin (vitamin B3) 57 , which stimulates the production of collagen (type I, III, and V), elastin and fibrillin (1 and 2), butto the best of our knowledgethis has only been substantiated ex vivo in dermal fibroblasts 58
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Vitamin B12 in health and disease
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