About this item TOP PICK BY VERYWELLHEALTH: selected as the top supplement for bone health by VeryWellHealth STRONG, HEALTHY BONES: TheraCal D2000 contains 1000 mg of calcium (per 4 tablets), vitamin D3, vitamin K2 and other nutrients essential for promoting bone strength and overall bone health.* OPTIMAL FORMULATION: TheraCal D2000 takes a multi-nutrient approach to bone health with 1000 mg of calcium citrate, 55 mcg (2,000 IU) of vitamin D3, 100 mcg of vitamin K2, 200 mg of magnesium, and 3 mg of boron. These ingredients are essential for good bone health and play an important role in calcium absorption.* SUPERIOR ABSORPTION: contains calcium citrate, which has been shown to have excellent bioavailability; also contains vitamin D, which aids in the absorption of calcium. TESTED AND CERTIFIED: Independently verified for content accuracy, purity, and freedom of contaminants through NSF International. Free from dyes and certified gluten-free. Made in the USA in a cGMP registered facility. Physician formulated and backed by Theralogix's Medical Advisory Board.