Dietary Supplement Two-Stage Timed-Release Fast-Acting First Stage Timed-Release Second StageThis product is formulated using a two-stage, time-release technology. The formula is designed to release half of the Vitamin C in this product rapidly and the other half gradually over a period of up to 12 hours**. One capsule in the morning and another 12 hours later extends the availability of Vitamin C to the body over a 24-hour period. Vitamin C provides antioxidant activity and is intended to provide nutritive support for normal, healthy collagen synthesis, cartilage and bone development. This product also contains Calcium Carbonate and Magnesium Oxide to buffer the natural acidity of Vitamin C. **Based on in-vitro dissolution tests designed to simulate the digestive process. Individual results may vary.