BioStacks
Carlyle

Vitamin C + Zinc

2 Softgels · 125 servings · $0.08/serving

iHerbAmazon

Best for

Immune

Ingredients (2)

Zinc

100%

Dose

100 mg

Target

15–30 mg

Form

Budget

Vitamin C

72%

Dose

180 mg

Target

250–2000 mg

Form

Budget

Other Ingredients (8)

Caramel ColorColor

Class III and IV caramel colors contain 4-methylimidazole (4-MEI), classified by IARC as Group 2B (possibly carcinogenic to humans) in 2011 (Monograph Vol. 101). California Prop 65 lists 4-MEI as a known carcinogen; products delivering >29 mcg/day require a cancer warning label. NTP TR-535 (2007) found 4-MEI caused lung tumors in mice. Major cola brands (Coca-Cola, Pepsi) voluntarily reformulated 2012-2014 to reduce 4-MEI below California thresholds. Because labels never specify Class I (sugar + heat only, safer) vs Class III/IV (ammonia-process, contains 4-MEI), consumers cannot verify which they're consuming. Combined with the additive's purely cosmetic purpose, the risk:benefit ratio is unfavorable for any supplement.

Soy LecithinEmulsifier

Widely used emulsifier derived from soybeans

GelatinCapsule

Protein derived from collagen, used in traditional capsule shells

Safflower Seed OilCarrier

Light, neutral oil from safflower seeds used as a carrier in softgels for fat-soluble nutrients

Sunflower LecithinEmulsifier

Non-GMO, non-allergenic emulsifier derived from sunflower seeds

Sunflower Seed OilCarrier

Common vegetable oil from sunflower seeds used as a carrier in softgels for fat-soluble nutrients

GlycerinHumectant

Sweet-tasting liquid used in soft capsules and liquids

BeeswaxCoating

Natural wax produced by honeybees, used as a coating and binding agent in softgels and tablets

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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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