Dietary Supplement. Gluten free. Vitamins. Calcium magnesium zinc provides superior bone support by helping maintain proper bone mineralization. Calcium is not produced by the body so proper amounts must be ingested to provide the benefits of this essential nutrient. Magnesium works with calcium to promote healthy bones, while zinc is added to help support immune function. 100% quality guarantee. naturestruthproducts.com. Promotes bone health. (These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure or prevent any disease.)