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It is, however, sensitive to light, especially ultraviolet light (as in sunlight). Excess intake is eliminated in the urine, which can give it a yellow-green fluorescent glow, commonly seen after taking B-complex 50mg or 100mg supplements. Intestinal bacteria produce varying amounts of riboflavin, so it is unclear what different people’s needs for B2 are. This may minimize the degree of riboflavin deficiency, even with diets low in riboflavin intake. For this reason, dietary deficiency is fairly common, and supplementation may help prevent problems.
Brewer’s yeast is the richest natural source of vitamin B2. Liver, tongue, and other organ meats are also excellent sources. Nori seaweed is a fine source. Lower levels of vitamin B2 are found in cabbage, carrots, cucumbers, apples, figs, berries, grapes, and tropical fruits.
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