Compound Monograph
Fluoride
Fluoride is a trace anion strongly accumulated by the tea plant; mature tea leaves are among the highest fluoride foods, and brick tea is a documented cause of skeletal fluorosis.
Sources · 3
Where Does It Come From?
Fluoride is a naturally occurring inorganic trace anion, found in Tea, Drinking water and Marine fish. It is flagged as moderately toxic.
Concentration
Content by Source
Reported concentrations across the plants that contain fluoride — the bar marks the typical level, the line shows the reported range.
Literature figures for varying plant parts and preparations. Read them as a comparative guide, not exact assays.
Research & Evidence
Camellia sinensis is an unusually efficient fluoride accumulator: it draws fluoride from the soil and concentrates it in the leaf, with older leaves holding far more than young buds. That makes tea the single largest dietary fluoride source for regular drinkers in many populations.
At low intakes fluoride is protective against dental caries, which is the basis of water fluoridation. At sustained high intakes it is deposited in bone and causes skeletal fluorosis — and the best-documented cases come directly from tea. Brick tea, pressed from mature and fallen leaves and drunk in quantity with milk in parts of Tibet, Mongolia and western China, has produced endemic fluorosis in those populations.
Content by Source
Commercial tea products span 91 to 820 mg/kg of dry leaf, with mature leaves measured up to about 2,800 mg/kg; the corresponding infusions run 0.43 to 8.85 mg/L 1Reference 1Human exposure assessment of fluoride from tea (Camellia sinensis L.): a UK based issue? Food Research International. https://doi.org/10.1016/j.foodres.2013.01.025View study →. Brick tea sits at the extreme, releasing around 7.3 mg/L against roughly 1.9 mg/L for black tea and 1.6 mg/L for green.
Between a quarter and four-fifths of the leaf’s fluoride passes into the infusion, so the brewed figure — not the dry-leaf figure — is what a drinker is exposed to.
Toxicity & Safety
Ordinary tea drinking is not a fluorosis risk. The documented cases involve brick tea, very high daily volumes, or both, usually alongside fluoride-rich drinking water. The upper intake level for adults is 10 mg/day, which heavy consumption of high-fluoride tea can approach.
References
- Chan L, Mehra A, Saikat S, Lynch P (2013). Human exposure assessment of fluoride from tea (Camellia sinensis L.): a UK based issue? Food Research International. https://doi.org/10.1016/j.foodres.2013.01.025
