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Hambidge (1976) and the high number of infants justifies a UF of 1.0, given that there is no evidence that intakes from formula of 5.8 mg/L of zinc result in infant toxicity.

Derivation of a UL. The NOAEL of 4.5 mg/day was divided by a UF of 1.0 to obtain a UL of 4 mg/day (rounded down) for infants ages 0 through 6 months. No adverse effects of zinc in children and adolescents could be found. Due to a dearth of information, the UL for young infants was adjusted for older infants, children, and adolescents on the basis of relative body weight as described in Chapter 2 and using reference weights from Chapter 1 (Table 1-1). Values have been rounded down.

Zinc UL Summary, Ages 0 through 18 Years

UL for Infants

0–6 months

4 mg/day of zinc

7–12 months

5 mg/day of zinc

UL for Children

1–3 years

7 mg/day of zinc

4–8 years

12 mg/day of zinc

9–13 years

23 mg/day of zinc

UL for Adolescents

14–18 years

34 mg/day of zinc

Pregnancy and Lactation

Because the UL is based on reduced copper status and because there are inadequate data to justify a different UL for pregnant and lactating women, the UL for pregnant and lactating women is the same as that for nonpregnant and nonlactating women.

Zinc UL Summary, Pregnancy and Lactation

UL for Pregnancy

14–18 years

34 mg/day of zinc

19–50 years

40 mg/day of zinc

UL for Lactation

14–18 years

34 mg/day of zinc

19–50 years

40 mg/day of zinc



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