Zinc
Critical for immune function, testosterone, wound healing, taste, smell, and skin. One of the most consistently under-consumed minerals, especially in plant-heavy diets.
Strong for immune function (cold duration reduction, T-cell support), wound healing, acne, taste recovery in deficient people, and male fertility. Modest testosterone elevation in deficient men (not in already-replete men). Effects on immunity: days. Acne, skin: 4–8 weeks. Testosterone: 6–12 weeks.
Zinc is a cofactor for over 300 enzymes and structurally embedded in over a thousand proteins (zinc fingers in DNA-binding transcription factors). It runs immune cell production and function, T-cell maturation, wound healing, sperm production, taste/smell perception, and is required for testosterone synthesis. Plant foods contain zinc but it's largely bound up by phytates — vegetarians and vegans typically absorb 30–50% less than omnivores. Deficiency symptoms (poor immunity, slow healing, loss of taste, hair loss, acne, low testosterone) are common and easily reversed.
- Form
- Zinc picolinate or bisglycinate — well-absorbed, well-tolerated. Citrate is fine too. Zinc carnosine (Pepzin GI) is specifically for gut healing. Lozenges (acetate or gluconate) for acute viral illness — works at the throat tissue, must dissolve slowly. Avoid oxide and sulfate (poorly absorbed, GI upset).
- Dose
- 15–30 mg/day for general maintenance. 30–50 mg/day for immune support or wound healing. Don't exceed 40 mg/day chronically without monitoring — high zinc displaces copper.
- Timing
- With food (empty-stomach zinc often causes nausea). PM is common — zinc supports the GH and testosterone pulses that happen overnight.
- Schedule
- Daily. If running high doses (>40 mg) for more than a few weeks, supplement 1–2 mg copper to avoid imbalance, or cycle.
- Side effects
- Nausea on empty stomach. Metallic taste. Copper deficiency at high chronic doses (anemia, neuropathy). Lozenges can numb the throat or cause oral irritation.
- Interactions
- Reduces absorption of: tetracyclines, fluoroquinolones, bisphosphonates, penicillamine, copper, iron — separate by 2 hours. Thiazide diuretics increase zinc loss.
- Contraindications
- None at sensible doses. Long-term very high doses (>100 mg/day) are immunosuppressive and depletive of copper — avoid.
- Lab markers
- Serum zinc (limited utility — homeostatically regulated). Plasma zinc with food-restriction protocol. Copper-to-zinc ratio (more useful than either alone). Alkaline phosphatase (zinc-dependent enzyme) low when zinc low.
- Food sources
- Oysters (extraordinary — single oyster can deliver a full RDA), red meat (beef especially), lamb, pumpkin seeds, hemp seeds, cashews, chickpeas, lentils, oats. Animal-source zinc absorbs significantly better than plant-source.
Pairs with
Vitamin A (zinc is required to mobilise A from liver). Vitamin C and elderberry (immune stack). Copper (balance — 10–15:1 zinc:copper ratio). Magnesium and vitamin B6 (the ZMA stack for sleep and recovery).
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