This Swanson product is formulated with science and crafted with care. Our D3 dietary supplement delivers 125 mcg of vitamin D3 to help cover dietary gaps, especially for those with limited sun exposure. Vitamin D supports bone health by aiding calcium absorption, helping maintain healthy bones, teeth, and muscles while also contributing to healthy energy levels. It also promotes immune health and may support heart health as part of overall wellness. This vitamin supplement undergoes rigorous testing for purity and potency, making it a reliable addition to your daily routine. We carefully select and source ingredients and work only with trusted partners. Backed by over 150 years of combined experience, our team of pharmacists, scientists, nutritionists, and quality experts ensures every product is tested for guaranteed purity, potency, and reliability.