BioStacks
Best for
Ingredients (4)
Magnesium
100%Dose/day
399 mg
Target
100–400 mg
Form
Premium
Vitamin D3
100%Dose/day
2004 IU
Target
1000–5000 IU
Form
Premium
Vitamin K2
57%Dose/day
51 mcg
Target
90–200 mcg
Form
Premium
Calcium
67 mgTrace amount — not scored
Other Ingredients (7)
MaltodextrinBinder
Spikes blood sugar faster than table sugar (glycemic index 85–105). Research links it to gut bacteria changes that may promote intestinal inflammation (Nickerson et al. 2015). Used as a cheap filler — adds nothing beneficial.
Rice FlourFiller
Rice-based ingredients carry risk of inorganic arsenic contamination (FDA and Consumer Reports). Rice accumulates arsenic from soil at higher rates than other grains. Used as a cheap filler — adds nothing beneficial.
Magnesium OxideMineral Source
An inorganic magnesium salt used as a magnesium source or bulking mineral.
Magnesium StearateLubricant
A salt of stearic acid used as a lubricant in tablet and capsule production
Silicon DioxideAnti-caking
Fine silica powder used to prevent clumping
Citric AcidAcidulant
Natural acid derived from citrus fruits
Capsule ShellCapsule
Generic capsule shell where the label does not specify the material. Common materials are hypromellose (HPMC) for vegetarian capsules and gelatin for traditional capsules — both are GRAS-listed and safe. Fish gelatin and pullulan variants also exist.
How to Take It
Best taken in the evening
The Magnesium in it is what pulls this toward the evening. Take it with a meal containing fat — the vitamins D and K in it absorb poorly without one.
With a meal containing fat
Space it a couple of hours from Iron and Calcium
Label directs 3 servings — keep one for the evening
On the label
As a dietary supplement, take one capsule three times per day with food and water.
General guidance based on the ingredients, not a substitute for the label or your doctor.
Price Check
$15.19
Near the median of 586 vitamin D 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.