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Nutritional SupplementNSF - Contents CertifiedCSbioactive®Dye FreeGluten Free OptiFlex-C is a chondroitin sulfate supplement designed to promote healthy mobility by supporting joint structure and function. Formulated by Rheumatologists just two capsules a day provide 800 mg of the same high-quality chondroitin sulfate used in clinical studies.Chondroitin is a natural component of cartilage supporting its elasticity.Independently content-certified by NSF® International.Take with OptiFlex-G for optimal joint health benefits.