Copper
Essential trace mineral that's easy to overlook — until you've taken high-dose zinc for a few months and depleted it. Required for iron metabolism, collagen cross-linking, and energy production.
Strong for reversing deficiency-related anemia, neutropenia, and neuropathy. Strong for preventing the zinc-induced copper deficiency that catches long-term high-dose zinc users. Less evidence for benefit in already-replete people. Effects: 4–8 weeks.
Copper is a cofactor for ~12 essential enzymes including cytochrome c oxidase (the final step of mitochondrial energy production), superoxide dismutase (antioxidant), lysyl oxidase (collagen and elastin cross-linking — what makes connective tissue strong), and ceruloplasmin (which loads iron onto transferrin). Most people get enough from food, but zinc supplementation — particularly at high doses for more than a few weeks — competitively depletes copper. Copper deficiency presents as anemia, low neutrophil count, easy bruising, and neurological symptoms. Just as importantly: too much copper is also a problem (Wilson disease, copper IUDs in some women), so the goal is balance, not maximisation.
- Form
- Copper bisglycinate — best-absorbed, gentlest. Copper sulfate — cheap, common, fine. Often included in multivitamins at 1–2 mg.
- Dose
- 1–2 mg/day. Only supplement if running high-dose zinc, eating very plant-heavy / phytate-rich diets, or with documented deficiency. Total intake ceiling: 10 mg/day from all sources.
- Timing
- Anytime, with food. Separate from zinc by at least 2 hours (they compete for absorption).
- Schedule
- Daily, paired with zinc supplementation.
- Side effects
- Nausea, GI upset, metallic taste at high doses. Excess copper deposits in liver and brain over time (Wilson disease territory).
- Interactions
- Zinc (competitive absorption — most important interaction). Iron (high copper can elevate iron). Penicillamine, trientine (copper chelators — opposite direction).
- Contraindications
- Wilson disease (genetic copper accumulation — copper supplementation contraindicated). Hemochromatosis (copper increases iron levels). Cholestatic liver disease (copper accumulates).
- Lab markers
- Serum copper. Ceruloplasmin (the carrier protein — better functional marker). Copper-to-zinc ratio in serum is the most clinically useful — should be roughly 1:1, with high zinc:copper ratio (>1.5) suggesting copper deficiency.
- Food sources
- Beef liver (by far the richest source), oysters, dark chocolate, cashews, sesame seeds, sunflower seeds, lentils, mushrooms, shiitake mushrooms, spirulina. A single 3 oz serving of beef liver delivers roughly 14 mg copper.
Pairs with
Zinc — these two should always be balanced (10–15:1 zinc:copper ratio). Iron (copper is required to mobilise iron). Vitamin C can reduce copper absorption at high doses — separate timing.
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