DNA's Effervescent Calcium is a complete formula that will help you retain strong bones, and its Vitamin D can help bolster the immune system to tackle Viruses that attack the lungs*. We are sure that you will find in our Effervescent Calcium the perfect supplement for your needs, including ALL the Vitamin D3 you require daily. What is DNA's Effervescent Calcium? DNA's Effervescent Calcium is a Calcium supplement formula designed to help patients that have problems taking large tablets. What makes DNA's Effervescent Calcium different? DNA's Effervescent Calcium dissolves in water, allowing for the complete dissolution and ionization of the calcium. It creates a buffered solution, which also enhances calcium absorption in the digestive track, and it can be taken with or without meals.? Also, since carbon dioxide is released during the dissolution of effervescent tablets, no gastric gas is produced in the stomach, eliminating bloating and alleviating discomfort in the upper gastrointestinal tract. Why is Vitamin D important? Vitamin D helps you absorb Calcium, but it is also an Anti-inflammatory, Antioxidant and has Neuroprotective properties that support Immune Health, Muscle function and Brain Cell Activity. Do I get enough Vitamin with DNA's Effervescent Calcium? Yes. According to the Mayo Clinic adults need between 600IU and 800IU of Vitamin D and DNA's Effervescent Calcium provides 880IU of Vitamin D which is up to 110% of your daily needs.