21st Century's Calcium Magnesium Zinc + D3 supplement provides these four essential nutrients in a single tablet. It includes 1000mg of calcium from calcium carbonate, 400mg of magnesium from magnesium oxide, 15mg of zinc from zinc oxide, and 10mcg of Vitamin D3. This blend is often chosen to support bone health, muscle function, and immune system well-being.
The dosages for calcium (1000mg) and zinc (15mg) are reasonable for daily supplementation, and Vitamin D3 at 10mcg (400 IU) supports calcium absorption. However, the magnesium dosage of 400mg is slightly above the 350mg upper limit for supplemental magnesium, potentially causing mild digestive upset for some. Furthermore, the reliance on carbonate and oxide forms for calcium, magnesium, and zinc means that the actual amount absorbed by the body might be lower compared to more bioavailable chelated or citrate forms.
While this product offers a convenient way to get these minerals, its effectiveness is somewhat limited by the choice of less bioavailable ingredient forms, especially for magnesium and zinc. It serves as a basic, accessible option but might not be optimal for individuals seeking maximum absorption or those prone to digestive sensitivity from magnesium oxide.
