Klaire Labs Cal-Mag 2:1 Plus D supports healthy bone formation. Calcium and vitamin D support bone mineral density. Magnesium supports bone strength and remodeling. Cal-Mag 2:1 Plus D supplies calcium citrate, a highly absorbable, well-tolerated source of calcium, balanced with magnesium in a 2:1 ratio. Magnesium bisglycinate chelate from Albion Laboratories provides highly absorbable magnesium that is unusually well-tolerated without GI side effects. Natural vitamin D3 assists calcium absorption to enhance benefits for bone health. May be used with MultiThera multiple vitamin/mineral supplements to augment calcium, magnesium, and vitamin D intake when necessary. Recommended Use: 2 tablets, 1 to 2 times daily with food or as directed by a healthcare professional.