BioStacks
21st Century

Calcium 1000 mg

1 Tablet · 90 servings · $0.07/serving

19 / 100Very Poor

Score Breakdown

Formulation
52
Safety
36
Final score
19/100

Ingredients (2)

Vitamin D3

80%

Dose

800 IU

Target

1000–5000 IU

Form

Premium

Calcium

100%

Dose

1000 mg

Target

200–600 mg

Form

Budget

Other Ingredients (11)

Blue 2 LakeColorant

A synthetic coal-tar/petroleum-derived dye used purely for color, linked to behavioral concerns in sensitive children. The lake form adds aluminum. No health benefit — we flag all artificial colors.

TalcAnti-caking

IARC classifies cosmetic-grade talc not containing asbestos as Group 2B (possibly carcinogenic to humans); perineal talc use as Group 2A (probably carcinogenic). Johnson & Johnson voluntarily withdrew talc-based baby powder from US/Canada in 2020 and globally in 2022 after extensive litigation tied to ovarian-cancer and mesothelioma cases. The 2018 FDA contamination survey found asbestos in 9 of 52 cosmetic talc products tested. As a supplement excipient talc is a pure manufacturing convenience — no nutritional or functional benefit to the user — so the asbestos-exposure risk has no offsetting upside. Safer alternatives (silicon dioxide, microcrystalline cellulose, rice hulls) are widely available.

Titanium DioxideColorant

Banned in the EU (2022) over concerns that its ultra-fine particles may damage DNA in gut cells. Still allowed in the US. Used only for white coloring — provides no health benefit.

Artificial ColorsColorant

May trigger hyperactivity in sensitive children; potential link to allergic reactions

FD&C Yellow No. 6Colorant

May trigger sensitivity in some individuals; behavioral concerns in susceptible children

Magnesium StearateLubricant

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

Polyethylene Glycol (Coating)Coating

A polyether polymer used as a tablet coating and plasticizer

Polyvinyl AlcoholCoating

Synthetic, water-soluble polymer used as a film former and binder in immediate-release tablet coatings

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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.