Fluoride upper limit: how much is too much per day?

For adults 19 and older, the upper limit (UL) of fluoride is 10 mg per day, counting all sources together, food and supplements included.

Ages 14 and older · Source: National Academies Dietary Reference Intakes · Data as of 2026-10-03

Every life stage

Group	Age	RDA or AI mg/day	UL mg/day
Male	14–18	3 AI	10
Male	19–30	4 AI	10
Male	31–50	4 AI	10
Male	51–70	4 AI	10
Male	71+	4 AI	10
Female	14–18	3 AI	10
Female	19–30	3 AI	10
Female	31–50	3 AI	10
Female	51–70	3 AI	10
Female	71+	3 AI	10
Pregnancy	14–18	3 AI	10
Pregnancy	19–30	3 AI	10
Pregnancy	31–50	3 AI	10
Lactation	14–18	3 AI	10
Lactation	19–30	3 AI	10
Lactation	31–50	3 AI	10

RDA = Recommended Dietary Allowance; AI = Adequate Intake, used where there is not enough data for an RDA. UL = Tolerable Upper Intake Level. “Not set” means the tables give no value. Ages under 14 are in the National Academies tables and are not covered here.

What counts toward the limit

This UL covers your total intake: fluoride from food, water and supplements added together.

Table footnote, as recorded in Ceiling’s data: “UL is total intake from food, water and supplements.”

How Ceiling uses this

Ceiling adds up every supplement you scan and compares your daily total with this number. Ceiling counts supplements only, so food and water come on top of the total it shows. Ceiling is coming soon on iPhone. No account; everything stays on your iPhone.

What is the upper limit of fluoride?