Vitamin D-1000

What Is Vitamin D-1000?

Vitamin D-1000 by Thorne delivers 1,000 IU of vitamin D3 (cholecalciferol) — the same form your body produces from sunlight — in a single daily capsule. This maintenance-level dose is designed for individuals who are not severely deficient but want to sustain optimal vitamin D status throughout the year, particularly during low-sunlight months. It is gluten-free, dairy-free, and soy-free, making it appropriate for a wide range of patients.

Key Benefits

• Helps maintain healthy vitamin D blood levels for patients already in a sufficient range
• Supports bone density and calcium absorption in partnership with vitamin K2
• Promotes healthy immune system modulation and seasonal immune resilience
• May help support cardiovascular health and healthy blood pressure already in normal range
• Supports muscle function and helps reduce the risk of muscle weakness associated with low D levels
• Gentle enough for long-term daily maintenance without risk of accumulation at this dose

Who Should Take This?

Vitamin D-1000 is ideal for adults who have confirmed adequate vitamin D levels and need only a maintenance dose, individuals who get regular outdoor sun exposure but live in northern latitudes during winter, children and older adults requiring a conservative daily D supplement, and patients who are already taking higher-dose D and transitioning to a maintenance protocol. Our doctors recommend pairing with a vitamin K2 supplement for optimal bone and cardiovascular benefit.

How to Use

• Serving size: Take 1 capsule daily
• Timing: Take with a fat-containing meal to maximize absorption, as vitamin D is fat-soluble
• Duration: Suitable for ongoing daily use; periodic blood testing (25-OH vitamin D) helps confirm optimal levels
• Stacking: Pairs well with Thorne Vitamin K2 or a combined D/K2 product, magnesium (cofactor for vitamin D activation), and a quality multivitamin

Our Doctors’ Take

Our doctors view vitamin D as one of the most universally important nutrients for modern patients, given that the majority of Americans spend most of their day indoors. The 1,000 IU dose is an excellent maintenance option for patients whose blood levels are in range — and we regularly use it as a daily sustaining dose after patients have completed a higher-dose repletion protocol. Simple, clean, and effective.*

*These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.