Originally published on. This article explores the comparison between oyster shell calcium and calcium citrate. Many people often wonder which form of calcium is more effective for supplementation: oyster shell calcium vs calcium citrate. In this discussion, we will delve into the benefits and drawbacks of both options, highlighting how oyster shell calcium vs calcium citrate may affect absorption and overall health. Ultimately, understanding the differences between oyster shell calcium vs calcium citrate can help individuals make more informed choices regarding their calcium supplementation.