Supports bone health, immune function, and muscle strength
Clinically tested, superior absorption with D3 form
Allergen-free, non-GMO, made in USA, GMP-certified
Bone & Teeth Support | Immune Function | Muscle Strength | Non-GMO | Made in USA | GMP Certified
Thorne Vitamin D3 delivers clinically superior cholecalciferol (vitamin D3)—the most effective and bioavailable form of vitamin D—to help maintain strong bones, healthy teeth, optimal immune function, muscle strength, and cardiovascular health. Ideal for individuals with limited sun exposure, older adults, and anyone needing to maintain or restore healthy vitamin D levels.
Superior D3 Form
More potent and well absorbed compared to D2 plant-based forms, ensuring effective blood level improvement.
Supports Declining Vitamin D Levels
Ideal for those with little sun exposure, older age, sunscreen use, or restricted diets.
Bone, Muscle & Immune Benefits
Enhances calcium absorption for bone density, supports lean muscle strength, and boosts immune defense.
Clinically Tested & Clean
Free of gluten, soy, dairy, preservatives, and artificial colors. Many options are NSF Certified for Sport®.
| Product | Dose | Ideal For |
|---|---|---|
| D-1,000 | 1,000 IU | Daily maintenance dose |
| D-5,000 | 5,000 IU | Correcting insufficiency (common use) |
| D-10,000 | 10,000 IU | Short-term therapeutic under supervision |
Q: How much should I take?
A: Most adults benefit from 1,000–5,000 IU daily. 10,000 IU should only be taken short-term and under medical guidance.
Q: When should I take Vitamin D3?
A: Take it with a fat-containing meal for best absorption. Thorne’s oil-based softgels ensure reliable absorption anytime.
Q: Is it safe for long-term use?
A: Yes, especially at maintenance doses (1,000–5,000 IU). Monitor blood levels for safety if using higher doses long-term.
Manufactured in the USA, in a GMP-certified, non-GMO facility. Each batch is third-party tested for purity, potency, and safety. Thorne is trusted by healthcare professionals and elite athletes worldwide.
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