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Based on the current evidence that CM supplementation does not enhance blood flow and thereby increase nutrient delivery and/or remove waste metabolites, this might explain why no positive impact has been reported to date for muscle soreness and subsequent exercise performance

Clinical signs of riboflavin deficiency include sore throat, redness and swelling of the lining of the mouth and throat, cracks or sores on the outsides of the lips (cheliosis) and at the corners of the mouth (angular stomatitis), inflammation and redness of the tongue (magenta tongue), and a moist, scaly skin inflammation (seborrheic dermatitis)

PLoS One 8:e62267

Considering the number of patients and the few reported cases, you can see how rare these reactions really are