For patients treated for zinc deficiency or using supplemental zinc, what copper supplementation is advised?

For patients treated for zinc deficiency or using supplemental zinc, what copper supplementation is advised?

• A. 1 mg copper for each 8-15 mg zinc
• B. 1 mg copper for each 2 mg zinc
• C. 2 mg copper for every 100 mg zinc
• D. 0.5 mg copper for each 20 mg zinc

Answer: (A)

When zinc is given in high amounts or over a long period, it can interfere with copper absorption in the gut. This happens because zinc increases the production of a protein called metallothionein, which binds copper and reduces its uptake, potentially leading to copper deficiency. To prevent this, copper is added at a practical ratio to zinc. The commonly recommended approach is about 1 mg of copper for every 8 to 15 mg of zinc. This ratio helps maintain adequate copper status while you’re correcting zinc deficiency or taking zinc supplements. Why the other ratios aren’t as suitable: ratios that give much more copper per zinc could risk copper excess, while ratios with far less copper wouldn’t adequately counteract the zinc-induced absorption issue during high zinc use. The 1 mg per 8–15 mg zinc guideline is a balanced, widely used rule of thumb for this situation.

When zinc is given in high amounts or over a long period, it can interfere with copper absorption in the gut. This happens because zinc increases the production of a protein called metallothionein, which binds copper and reduces its uptake, potentially leading to copper deficiency. To prevent this, copper is added at a practical ratio to zinc. The commonly recommended approach is about 1 mg of copper for every 8 to 15 mg of zinc. This ratio helps maintain adequate copper status while you’re correcting zinc deficiency or taking zinc supplements.

Why the other ratios aren’t as suitable: ratios that give much more copper per zinc could risk copper excess, while ratios with far less copper wouldn’t adequately counteract the zinc-induced absorption issue during high zinc use. The 1 mg per 8–15 mg zinc guideline is a balanced, widely used rule of thumb for this situation.