THORNE - Vitamin D + K2 Liquid with a Metered Dispenser - Vitamins D3 & K2 to Support Healthy Bones & Muscles* - 1 Fl Oz (30 ml) - 600 Servings

Clinical trials typically use 1,000-4,000 IU daily (25-100 mcg). Thorne D/K2 Liquid delivers 1,000 IU D3 + 200mcg K2 per drop (adjustable), which we classify as Full relative to that range.

See the "Also consider" section below for two alternatives. Choose based on form preference (Liquid drops in MCT oil vs alternatives), dose adequacy, and third-party testing.

Yes — NSF Certified for Sport. Third-party testing verifies ingredient identity and label accuracy.

Yes — Amazon Subscribe & Save is available for this product. Enrolling locks in a recurring delivery at a reduced per-unit price.

Yes, Thorne D/K2 Liquid is designed for daily use at the recommended serving size. Thorne follows Good Manufacturing Practices (GMP), and the product has been well-tolerated in thousands of customer reviews.

Vitamin D toxicity is rare and typically occurs only at sustained intakes above 10,000 IU daily without medical supervision. At 1,000 IU D3 + 200mcg K2 per drop (adjustable), this product is within safe limits for most adults, but you should test your serum 25(OH)D levels periodically.

Vitamin D supplementation is generally recommended during pregnancy, but doses above 2,000 IU should be discussed with your OB-GYN. The American College of Obstetricians and Gynecologists recommends at least 600 IU daily for pregnant women.

Vitamin D can interact with certain medications including thiazide diuretics, corticosteroids, and weight-loss drugs like orlistat. The K2 component may interact with blood thinners like warfarin. Consult your healthcare provider if you take prescription medications.

Side effects are uncommon at recommended doses. Very high doses of vitamin D may cause nausea, constipation, or elevated calcium levels. Start at the recommended serving and monitor how you feel during the first two weeks.

Each bottle contains 600 servings. At one serving per day, this provides approximately 20 months of daily supplementation.