Thorne Vitamin D/K2 Liquid Review

Vitamin D + K2 Liquid from Thorne is presented as a convenient combination of vitamin D and vitamin K for bone, cardiovascular, and immune support. The page states that the product promotes bone health, healthy immune function, and cardiovascular health, and that the combination of vitamin D3 and K2 provides greater benefits together than either does individually. The details section explains that vitamin D3 and K2 work together to benefit bone health, cardiovascular support, and healthy immune function. Maintaining an optimal level of vitamin D throughout all stages of life is described as helping maintain strong bones and healthy immune function. Adding vitamin K2 is described as helping move calcium to the bones to protect soft tissues, such as the arteries and kidneys, from calcification. The listed benefits include supporting a healthy heart and blood circulation, promoting bone health and calcium absorption, benefiting immune function, and providing advanced bone health support. The listed features include that the vitamin K2 in this formula is MK-4, described as the most clinically studied form of vitamin K; that vitamin D in its D3 form is described as more potent and better absorbed than its D2 form; that the self-dispensing top provides an accurate, safe, and individualized dose by metering individual drops; and that the liquid is in medium chain triglyceride oil and preserved with mixed tocopherols. The page says the product has been third-party tested and certified to verify that what is in the package matches the label and to confirm it contains no unsafe levels of contaminants such as heavy metals, pesticides, and microorganisms. Serving size is listed as 2 drops with 600 servings per container, and the price is listed as $34 for 1200 drops. A subscription option lists $30.60 with a 10 percent discount. Warnings state that the product is contraindicated in individuals with a history of hypersensitivity to its ingredients, that pregnant individuals should consult a health-care practitioner, that vitamin K can interfere with a med drugs such as a med, and that the product is not intended for children under 12 months. The FAQ section says the formula is ideal for those wanting to support bone, cardiovascular, and immune health, and recommends testing vitamin D levels before supplementation. It also explains that Thorne tests each ingredient for identity, purity, and potency, and that vitamin D3 is generally considered the preferred form because it is more effective at raising and maintaining vitamin D levels in the blood than D2. The FAQ further describes vitamin D and K2 as working together, with vitamin D enhancing calcium absorption and retention and vitamin K2 helping direct calcium into bones and teeth and away from soft tissues. Individuals taking meds are advised to consult a health-care professional before using vitamin K supplements.

Product Focus: Bone Health
Tier ⓘ
Members see this product's tier and why. Tiers run from 1, the strongest evidence, to 5. How we grade →
Evidence ⓘ
How strongly the evidence says this product works: human studies count most, then real reviews, then our biohacker panel.
Positive Reviews
Biohacker Mentions
Cost per month
$2

Study, Trial or Testing Result Summary

MembersHuman studies

Both ingredients in this liquid are at or the doses used in studies. Vitamin K2, at 200 micrograms here, has the support for bone . …

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Review Totals and Summary

Members7,180 reviews
7,180 reviews · Amazon 6,832 · Walmart 348

This Thorne Vitamin D/K2 Liquid has garnered about 7180 ratings across various stores, presenting a but generally picture for potential buyers. customers its effectiveness and the convenience of its liquid form, though a number express frustration with its dispensing mechanism. **What it did for them** users report impacts from taking this supplement. …

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Biohacker Summary

MembersWhat our biohacker panel says

The panel leans toward vitamin D, which is a minor ingredient here in the panel's discussion but is listed as a smaller ingredient in this product, and it drew comments from ten of them. Four of them said they take it themselves, and three of those take 5,000 IU of D3 in the morning, while one has taken D3 with K2 for over a decade. …

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RAL Summary

MembersThe tier and why

pooled analyses show vitamin K2 spine bone density in postmenopausal women with thinning bones. …

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More Details

MembersBody systems · Combine with · Possible side effects

Body systems: Skeletal system. Combine with and possible side are for members.

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Supplement Facts

Vitamin D3 25 mcg · Vitamin K2 200 mcg
Supplement Facts
Serving Size 2 Drop(s)
Servings Per Container 600
Amount Per Serving% Daily Value
Vitamin D325 mcg
Vitamin K2 (Menatetrenone)200 mcg

Other ingredients: Mixed Tocopherols, Medium Chain Triglycerides.

Label source: Thorne · Report a label change

Where to Buy

Thorne · Amazon · Mayo Clinic Store
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Our articles on this subject

Graded October 26, 2026 by the Reverse Age Lab evidence engine, from human studies, real reviews and our biohacker panel. How we grade. Is this medical advice? No. Rala organizes the published evidence; go over any change with your doctor, especially if you take meds.