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Cupric Oxide

Low concern

Cupric oxide is recognized as a source of copper, an essential trace mineral. Copper has an Upper Intake Level of 10 mg/day for adults; chronic excess can cause liver toxicity.

Found in

66 products

What it is

A black-to-brown inorganic copper compound (CuO) used as a source of dietary copper in supplements and fortified foods.

Nutrient supplement providing copper.

Why it's flagged

excess copper toxicity at very high doses

What regulators actually say

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Regulatory status

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