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Vitamin & Mineral SupplementContents Certified NSFDye FreeGluten FreeVeganTheraLith XR is an extended-release vitamin and mineral supplement formulated to support kidney health.Four tablets provide 12 mEq of citrate alkali from magnesium and potassium citrate along with 15 mg of vitamin B to promote healthy urine chemistry.Extended-release coating to minimize stomach upset and promote optimal absorption. Independently content-certified by NSF® International.