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Nutritional SupplementContents Certified NSFNo DyesGluten FreeVegetarianTheraCal D4000 is a nutritional supplement designed to support bone health.Formulated by Rheumatologists. Four daily tablets provide 100 mcg (4 000 IU) of vitamin D to replete a low vitamin D level along with calcium citrate for optimal absorption magnesium vitamin K2 and boron. Independently content-certified by NSF® International.