Source: NIH Office of Dietary Supplements — Zinc — RDA 8–11 mg; 30 mg is a common supplemental dose (UL 40 mg/day).
An essential mineral and cofactor for hundreds of enzymes, immunity and hormones.
Serves as a structural and catalytic cofactor across 300+ enzymes.
Nausea if taken on an empty stomach. Long-term high doses cause copper deficiency — keep under the 40 mg/day upper limit unless directed.
| Per serving | |
|---|---|
| Typical branded single-ingredient product | $0.17 |
| Bulk powder at the clinical dose (250g, $20.97) | $0.01 |
Buying bulk powder instead of a branded bottle saves about 95% per serving.
Bulk price: $20.97/250g →Educational only — not medical advice. Grades and clinical doses are computed from public labels against sourced research (citations on the main site); prices last verified 2026-07-21. Expensive Powder has no sponsors; bulk links may earn an affiliate commission, which never affects a grade. Talk to a clinician before starting any supplement.