Description : Calcium supplement; all natural, easy to digest & derived from plants - not rocks. CDK marine algae supplies all 13 essential bone supporting minerals; calcium, magnesium, boron, copper, manganese, silicon, nickel, selenium, strontium, phosphorus, potassium, vanadium, and zinc. 1000 IU of vitamin D3 has been added to the algae powder to make Cavid an excellent bone maintenance support supplement. Take Cavid with your meals to optimize absorption. Take 3 capsules daily, 1 capsule with each meal. If you are maintaining your current healthy bone density, 2 capsules per day may be sufficient. How Much Calcium Do You Really Need Each Day? The daily target is 1200 mg per day of calcium intake from food and supplements for low bone density. An average person who consumes dairy products gets 500 – 700 mg of calcium from their daily diet, so you would need to supplement 500 – 700 mg of calcium. Each Cavid capsule contains 250 mg of calcium. So 2 to 3 capsules of Cavid = 500 to 750 mg calcium. The clinical studies resulting in modest bone density increases were based on participants taking 3 capsules per day.