Supplements
quercetin increases cellular zinc uptake
In plain terms: Does quercetin carry zinc into your cells, the way the quercetin-plus-zinc protocols assume?
Part of: 🧪 quercetin
It did in one 2014 lab study, cleanly. But no independent lab has replicated that measurement, and nobody has shown the concentration needed is reachable in human blood from a capsule. One lab is not a consensus.
📅 Last reviewed: 2026-07-26 ⓘ
Evidence ladder
How far up the ladder this claim has climbed. A high consensus on a low rung means "consistent so far," not "proven in people."
Top evidence so far: Cells in a dish (In-vitro)
How the studies fall
What the evidence shows
The zinc-ionophore mechanism behind the popular quercetin+zinc antiviral protocols rests on essentially ONE measurement: a 2014 study showing quercetin rapidly raised labile zinc in mouse hepatocytes and, critically, in a cell-free liposome model that rules out cellular transporters. It is a clean result.
The evidence (2)
| Source | Grade | Stance | Quality | Finding |
|---|---|---|---|---|
| Nakamura M et al 2023 · study_type: in-vitro | in-vitro | mixed | moderate | In HepG2/HCT116 cells, co-treatment with quercetin+Zn(II) (and a synthesized Zn-Q complex) produced a proportional rise in intracellular zinc uptake tracked by the ZnAF-2 DA zinc-fluorescence probe, alongside enhanced quercetin uptake. Abst TEMPERED: a SYNTHESISED Zn-quercetin complex in a cancer-apoptosis study, zinc uptake measured secondarily — not free quercetin acting as an ionophore, so it is partial corroboration only. |
| Dabbagh-Bazarbachi H et al 2014 · study_type: in-vitro | in-vitro | supports | high | Quercetin (and EGCG) rapidly increased labile/intracellular zinc in mouse Hepa 1-6 hepatocytes and, for the first time, in a cell-free unilamellar (DPPC/cholesterol) liposome model loaded with membrane-impermeant FluoZin-3 -- demonstrating |
Disagree, or know a study we missed?
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Educational only, not medical advice. Grades and scores reflect published evidence weighted by study design and quality; see the methodology.