Food-Based Calcium™ contains a 2:1 ratio of calcium to magnesium to support strong teeth and bones, plus vitamin D3, food and herbs to promote enhanced calcium absorption and gentle digestion. Food-Based Calcium™ is iron-free, gluten-free, sugar-free, lactose-free, dairy-free, wheat-free and yeast-free. It is 100% natural and contains no artificial colors, flavors, sweeteners, preservatives or additives. Gentle on the stomach. For a potent calcium boost, take 1 tablet a day or more if desired. For best results, take with a meal. 500 mg of calcium for strong teeth and bones 250 mg of magnesium for calcium absorption, and muscle aches and cramps 500 IU of vitamin D3 for colon and cardiovascular health, and calcium absorption 20 mg each of organic spirulina superfood, horsetail, stinging nettle and betaine for natural energy, and enhanced absorption and digestion without stomach upset Iron-free, sugar-free, lactose-free, dairy-free and wheat-free Allergen SafeGuard®: Contains no gluten, soy, yeast, milk, eggs, nuts, fish or shellfish 100% Natural - Free of artificial colors, flavors, sweeteners, preservatives or additives Rainbow Light was founded in 1981 in beautiful Santa Cruz, California by a team with a passion for providing healthy nutritional supplements grounded in the power of nature. From the beginning, Rainbow Light has created natural supplements that make a difference in the health and well-being of our customers while promoting sustainable practices for planetary health and contributing to the fight against global malnutrition. Our supplements are and have always been based in nutritious, whole foods. We carefully combine pure food and botanical extracts with nutrients to support all systems of the body, at potencies appropriate for the specific health objective. Expiration: Betty Mills guarantees this item will not expire within 60 days of receipt or we will ship you a replacement item at no cost.