Vitamin D3 and Vitamin C are essential for maintaining bone integrity and immune health. Vitamin D3, or cholecalciferol, helps regulate the metabolism of calcium and phosphorus, vital for bone strength. Vitamin C is a key component in collagen synthesis, which affects bone stability and the ability to withstand stress. Both vitamins are crucial for immune system support, which can indirectly influence bone repair and overall skeletal health. For detailed insights on the roles of Vitamin D3 and C in bone health, refer to the informative articles on Performance Lab® and PubMed.