**Vitamin D3** at 5,000 IU hits the top of the clinically studied maintenance range, giving you a full effective dose for bone health, immune support, and mood regulation in a single capsule. If you're correcting a deficiency or living in a northern climate, this is the dose range most practitioners recommend — no need to double up.

**Vitamin K2** is dosed at 120 mcg in the MK-7 form, which stays active in your body for roughly four days — far longer than the MK-4 form that clears in hours. At this dose, you're getting enough to help direct calcium into your bones and teeth rather than your arteries. The capsule also includes MCT oil, which helps absorption since both vitamins are fat-soluble.

The main limitation is that 120 mcg of K2 sits in the lower half of the studied range (90–200 mcg). If bone density is your primary goal, you may benefit from a product closer to 200 mcg.

BioStacks
California Gold Nutrition

Vitamin D3 + K2 as MK-7

1 Capsule · 60 servings · $0.15/serving

iHerbAmazon

Best for

Bone & JointImmuneDental

Ingredients (2)

Vitamin D

100%

Dose

5000 IU

Target

1000–5000 IU

Form

Premium

Vitamin K2

100%

Dose

120 mcg

Target

90–200 mcg

Form

Premium

Other Ingredients (6)

Magnesium StearateLubricant

A salt of stearic acid used as a lubricant in tablet and capsule production

Medium Chain Triglyceride OilCarrier

Fractionated oils rich in C8/C10 triglycerides used as neutral carrier or anti-sticking agent

Silicon DioxideAnti-caking

Fine silica powder used to prevent clumping

Dicalcium PhosphateBinder

Calcium and phosphorus compound used as binder

Microcrystalline CelluloseBinder

Plant-derived cellulose used as a binder and filler in supplements

Microcrystalline CelluloseBinder

Plant-derived cellulose used as a binder and filler in supplements

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Sources & Scoring

Nutrient data (RDA, UL, and safety thresholds) sourced from: NIH Office of Dietary Supplements and 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. clinical 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.

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