Thorne
Vitamin D + K2 Liquid
A four-ingredient liquid vitamin D3 and K2 supplement with a metered dropper for flexible dosing.
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Why We Love It
What makes Vitamin D + K2 Liquid a Label Lookout pick
Most liquid vitamin D drops either skip K2 or bury the dose in a blend. This one lists an exact milligram amount for both nutrients and builds the rest of the formula from two ingredients: MCT oil as the carrier and mixed tocopherols as a natural preservative. Nothing else is added. The metered dropper means one bottle covers a wide dose range instead of forcing a switch to a different size.
Clean Ingredient Profile
No artificial colors, flavors, or questionable preservatives. Thorne keeps it simple and transparent.
Meets Our Standards
Key qualities: Third-Party Tested, No Proprietary Blend, Gluten-Free, Dairy-Free, Soy-Free. Each claim verified through our ingredient analysis process.
Full Ingredient List
What's inside
Vitamin D3 (cholecalciferol) 1,000 IU (25 mcg) per 2-drop serving. Vitamin K2 (as menatetrenone, MK-4) 200 mcg per serving. Other ingredients: medium chain triglyceride oil, mixed tocopherols.
Common Questions
Frequently asked
What form of vitamin K2 does this use?
Menatetrenone, also known as MK-4. It has a shorter half-life in the blood than the MK-7 form used in some other supplements, which is why the label suggests taking it consistently rather than as an occasional high dose.
Is this vegan?
The label does not specify. Cholecalciferol, the vitamin D3 form used here, is most commonly derived from lanolin (sheep wool grease), though the exact source is not disclosed on this product.
Is it NSF Certified for Sport?
No. This liquid formula is third-party tested for label accuracy and contaminants, but the NSF Certified for Sport badge appears only on a subset of Thorne's other products.
How is dosing measured?
A metered dropper delivers individual drops. The label lists 2 drops as a standard serving (1,000 IU D3, 200 mcg K2), with up to 8 drops per day for higher repletion needs.
Ready to make the switch?
Every swap counts. Vitamin D + K2 Liquid is a cleaner choice you can feel good about — backed by our ingredient-level analysis.
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The Verdict
Pros & cons
What we love
- Four total ingredients: vitamin D3, vitamin K2 (MK-4), MCT oil carrier, and mixed tocopherols
- No proprietary blend, every amount is listed on the label
- Third-party tested and certified to verify label accuracy and screen for contaminants
- Metered dropper allows dosing from 1,000 IU up to 4,000 IU of D3 from one bottle
- Gluten-free, dairy-free, and soy-free, with no added flavors or sweeteners
!Worth noting
- Uses the MK-4 form of vitamin K2, which has a shorter half-life than the MK-7 form used in some competing products
- Not NSF Certified for Sport, a badge some other Thorne products carry
- Label does not disclose the source of the D3 (cholecalciferol), which is most commonly derived from lanolin, so vegans should confirm with the brand before buying
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Label Lookout Approved
Vitamin D + K2 Liquid by Thorne meets our strict standards for ingredient transparency and quality. Every recommendation is earned, never paid for.
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