Thorne, Vitamin D + K2 Liquid, 1 fl oz (30 ml)
Two drops provide 1,000 IU of D3 and 200 mcg of K2 as MK-4 in MCT oil, with 600 labeled servings per bottle. NSF currently lists this finished liquid product under its NSF/ANSI 173 dietary-supplement certification.
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Our Verdict
Its weighted score is 8.05/10. NSF certification and exceptional active-unit value nearly earn first place, but the MK-4 dose is far below the amount used in published MK-4 trials.
Score Breakdown
Pros & Cons
Pros
- •NSF/ANSI 173 Contents Certified, with the product present in NSF's current official listing
- •MCT-oil liquid avoids a dry capsule and permits dosing in two-drop increments
- •Costs approximately $0.057 per labeled serving and $0.028 per 100 mcg of K2
Cons
- •The 200 mcg MK-4 serving is 225 times lower than the 45 mg daily dose used in published MK-4 trials
- •The label does not disclose whether its D3 source is lanolin-derived or vegan
Specifications
| D3 Per Serving | 25 mcg (1,000 IU) |
| K2 Per Serving | 200 mcg |
| K2 Form | MK-4 (menatetrenone) |
| K2 Brand | Not stated on label |
| Delivery Form | MCT-oil liquid; two drops per serving |
| D3 Source | Cholecalciferol; source not disclosed on iHerb label |
| Third-Party Verification | NSF/ANSI 173 Contents Certified |
| Active Cost | $0.057 per 1,000 IU D3; $0.028 per 100 mcg K2 |
Who Is This For?
Best For
- Buyers prioritizing a recognized finished-product certification
- People who prefer liquid dosing over capsules
Not For
- Buyers specifically seeking longer-retained MK-7
- Strict vegans requiring a disclosed lichen-derived D3 source
Where to Buy
Appears In
Customer Reviews
Alternatives to Consider
Natural Factors, Vitamin D3 & K2, 25 mcg (1,000 IU) & 120 mcg
Natural Factors
One gelatin softgel supplies 1,000 IU of D3 and 120 mcg of MK-7 from natto bean in an MCT-oil matrix. The product carries the ISURA Verified Clean seal, whose certification standard includes finished-product potency, label integrity and contaminant screening.
Nordic Naturals, Vitamin D3 + K2, Great Orange, 60 Soft Gels
Nordic Naturals
Each gelatin softgel contains 2,000 IU of D3 and 90 mcg of MK-7 in organic extra-virgin olive oil. The D3 amount matches the daily dose used in VITAL, while the K2 amount is half of the 180 mcg MK-7 dose used in a three-year human trial.
MRM Nutrition, Vegan Vitamin D3 & K2, 60 Vegan Capsules
MRM Nutrition
One dry vegan capsule supplies 2,500 IU of lichen-derived D3 and 80 mcg of MK-7. Its active ingredients and three excipients are fully disclosed, and the product is Certified Vegan and Non-GMO Project Verified.
Doctor's Best, Natural Vitamin K2 MK-7 plus D3, 180 mcg, 60 Veggie Caps
Doctor's Best
Each dry vegetarian capsule contains 1,000 IU of D3 and 180 mcg of branded MenaQ7 MK-7. The K2 dose matches the amount used in a published three-year MK-7 trial, but the label lists numerous excipients and no recognized finished-product certification.