Discover Kirkman Purest Calcium with Vitamin D3 powder. Each serving delivers 1000 mcg calcium and 4.4 mcg Vitamin D3 in a 454 g (16 oz) unflavored, hypoallergenic formula. Uses Bisglycinate chelate for superior absorption and is gluten- and casein-free. This powder blends easily into foods or beverages and can be used in baking at moderate temperatures. Ultra Tested to exceed industry standards and screened for more than 950 environmental contaminants.