Cupric Oxide

Cupric Oxide is a tier 3 form of Copper, used in 478 on-market products and providing 79.9% elemental copper by weight.

Basis: CuO, MW 79.55 (stoichiometric only -- actual bioavailable copper delivered is very low)

Why this tier: Provides essentially no bioavailable copper relative to CuSO4 per chick/rat data.

Source: Baker DH. 1999, J Nutr 129:2278-9, PMID 10573563

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