Nature’s Bounty Vitamin D3 150mcg (5000-IU) is a high-potency supplement designed to support bone strength, immune function, and overall wellness. Each softgel delivers 125 mcg (5000 IU) of vitamin D3, the form of vitamin D that your body naturally produces when exposed to sunlight. Vitamin D3 aids in calcium absorption, essential for maintaining strong bones and teeth. It plays a crucial role in modulating the immune response, helping to defend against pathogens. Vitamin D3 supports muscle function and nerve signaling, contributing to overall neuromuscular health.