If you're reaching for this to support your immune system, you're well past the effective dose. **Zinc** comes in at 50mg per tablet, while the clinical research for immune function typically uses 15–30mg daily. The amino acid chelate form absorbs reasonably well, so a single tablet gives you a fully usable dose with room to spare.

There's also 125mg of calcium in each tablet, but that falls below the 200mg point where a supplemental dose starts to matter, and it won't meaningfully add to your daily calcium intake. Treat this as a zinc product, not a two-mineral one.

The bigger thing to know: 50mg sits above the 40mg daily upper limit for zinc. That's manageable for short stretches, like fighting off a cold, but taking it every day long-term can deplete your copper and tip the zinc-to-copper balance your body relies on. If you plan to use it beyond a few weeks, consider a lower daily dose or pairing it with a small amount of copper.

BioStacks
21st Century

Chelated Zinc 50 mg

1 Tablet · 60 servings · $0.05/serving

iHerbAmazon

Best for

Immune

Ingredients (2)

Zinc

100%

Dose

50 mg

Target

15–30 mg

Form

Standard

Calcium

125 mg

Trace amount — not scored

Other Ingredients (2)

Microcrystalline CelluloseBinder

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

Stearic AcidLubricant

Saturated fatty acid used as tablet lubricant

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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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