Source: NIH Office of Dietary Supplements — Vitamin C — RDA 75–90 mg; 500–1,000 mg is a common antioxidant/immune supplemental dose.
A common high-dose supplement amount, not a clinical target (RDA is 90 mg).
An essential antioxidant vitamin needed for immunity and collagen.
Donates electrons to neutralize free radicals and serves as a cofactor for collagen enzymes.
High doses cause diarrhea and can raise kidney-stone risk in susceptible people. The RDA is only ~90 mg; gram doses are a supplement choice, not a requirement.
| Per serving | |
|---|---|
| Typical branded single-ingredient product | $0.25 |
| Bulk powder at the clinical dose (1kg, $24.97) | $0.02 |
Buying bulk powder instead of a branded bottle saves about 90% per serving.
Bulk price: $24.97/1kg →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.