Feel your bones getting stronger & healthier each day, thanks to the GNC Calcium Citrate. It makes up for our digestive system’s inability to undertake maximum calcium absorption, which results in our body getting much more Calcium than the usual 15-20% from our diet. How? GNC Calcium Citrate contains the most absorbable and bioavailable form of Calcium in comparison to other Calcium compounds. This form does not need stomach acid to break it down into simpler form first, and it is swiftly absorbed by our body for faster nutritional use and better results.