**Vitamin D3** at 1,000 IU per serving — the floor of the clinical range, enough to maintain adequate levels if you're not deficient. The liquid format with MCT oil aids absorption since both vitamins are fat-soluble, and the flexible dosing (2 drops up to three times daily) lets you scale to 3,000 IU if your levels need more support.
**Vitamin K2** is dosed at 200 mcg, right at the top of the studied range for directing calcium into bones instead of arteries. The D3 + K2 pairing is well-supported — D3 increases calcium absorption while K2 ensures it goes where you want it. Together they cover bone density, immune function, and cardiovascular protection.
The K2 form here is MK-4, which clears your body in just a few hours compared to roughly four days for MK-7. If you're taking one serving daily, the K2 benefit may not last through the full day — splitting your dose across morning and evening would help.
BioStacks
Other Ingredients (2)
Medium Chain Triglyceride OilCarrier
Fractionated oils rich in C8/C10 triglycerides used as neutral carrier or anti-sticking agent
Mixed TocopherolsAntioxidant
Natural vitamin E used as preservative
How to Take It
Take it anytime
Fat-soluble — take with your largest fat-containing meal. Time of day doesn't matter.
With a meal containing fat
On the label
Suggested use: Take 2 drops one to three times daily or as recommended by your health-care practitioner. Invert bottle to dispense individual drops. May be added to food or mixed in beverages.
General guidance based on the ingredients, not a substitute for the label or your doctor.
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$34.00
Pricier than 90% of 552 vitamin D supplements
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Sources & Scoring
Nutrient data (RDA, UL, and safety thresholds) sourced from the NIH Office of Dietary Supplements and the National Academies Dietary Reference Intakes (DRI).
This is not medical advice. Consult a healthcare provider before making changes to your supplement routine.
The score analyzes what's on the label: ingredient doses vs. studied ranges, chemical forms, evidence levels, and known interactions. It does not verify label accuracy or test for contaminants — for that, look for third-party certifications like USP or NSF.