BioStacks
Best for
Ingredients (7)
Silicon
100%Dose
11 mg
Target
5–30 mg
Form
—
Boron
100%Dose
3 mg
Target
3–6 mg
Form
—
Horsetail
100%Dose
90 mg
Target
15–100 mg
Form
—
Calcium
100%Dose
399 mg
Target
200–600 mg
Form
Not listed
Magnesium
100%Dose
201 mg
Target
100–400 mg
Form
Not listed
Other Ingredients (13)
Sodium BorateBuffer
Classified as a Substance of Very High Concern (SVHC) under EU REACH for reproductive toxicity (Category 1B — may damage fertility and the unborn child). EFSA's tolerable upper intake from total boron exposure is 10 mg/day for adults; sodium borate dosing must stay well below this. Acute oral toxicity is moderate (lethal dose ~5–20 g in adults), but the chronic-exposure reproductive endpoint is the binding constraint. Largely phased out of modern supplements and personal care in favor of safer buffers (citrate, phosphate). If a current product lists sodium borate, the inclusion warrants scrutiny — there are safer alternatives for every excipient function it provides.
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
Lithothamnion CalcareaFiller
Calcified red seaweed used as a whole-food tablet base and natural calcium/magnesium source (common in food-based multivitamin lines)
Silicon DioxideAnti-caking
Fine silica powder used to prevent clumping
ZeinCoating
Corn-derived prolamine protein used as a natural tablet glaze and moisture barrier — a plant-based alternative to shellac
Calcium CarbonateBuffer
Common calcium salt used as a buffering agent, filler, or mineral fortification 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.