Calcium plays a crucial role in bone formation through osteoblasts, cells already present in the body that contribute to bone synthesis. In addition, calcium citrate regulates bone resorption by osteoclasts — the cells that breakdown bone tissue — that are coupled tightly in a delicate balance to maintain bone mass and strength. The calcium present in the blood and bones maintains a steady equilibrium. Give your bones the nutrition and boost they need. Rejuvenation Therapeutics Calcium Citrate is designed to help strengthen and revitalize your bones, which is often a need for postmenopausal women. This supplement supports bone health by delivering the proper dose of easy-to-absorb calcium to all the skeletal structures in your body. There is a sufficient amount for an entire month, allowing you to get your daily intake of bone-strengthening minerals and nutrients for 30 days. Our supplements are made from all-natural ingredients, are non-GMO, gluten-free and vegan-friendly and are great for both men and women. Additionally, they're certified by Good Manufacturing Practices (GMP). PLEASE NOTE: This product is dated with the manufacturing date, not an expiration date, according to the FDA guidance. This product is effective for at least 3 years following manufacturing date.