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Zinc – Immune System, Testosterone, and Wound Healing
What is Zinc?
Zinc is an essential trace element and, after iron, the second most abundant transition metal in the human body. It is a cofactor for over 300 enzymes and involved in more physiological processes than any other trace element. The body contains approximately 2–3 g of zinc, mainly in muscles (60%), bones (30%), and skin/liver/immune cells (10%).
Zinc and the Immune System
Zinc is essential for the development and function of almost all immune cells. It regulates:
- T-lymphocytes: Zinc is essential for thymus development and T-cell differentiation
- NK cells: Natural killer cells require zinc for their cytotoxic activity
- Neutrophils: First line of defense against bacteria – zinc-dependent function
- Antibody production: B-cell function and antibody synthesis are zinc-dependent
Zinc deficiency is considered one of the most common nutritional causes of immunosuppression worldwide. Even moderate deficiency increases susceptibility to infection and prolongs illness duration.
Zinc and Testosterone
Zinc is involved in testosterone biosynthesis in Leydig cells. It inhibits the enzyme aromatase, which converts testosterone into estradiol. Zinc deficiency has been shown to lead to lower testosterone levels. Several studies demonstrate that zinc supplementation normalizes testosterone levels in zinc-deficient men – however, zinc has no testosterone-boosting effect in men with adequate zinc levels.
Other Important Functions
- Wound healing: Zinc regulates fibroblast proliferation and collagen synthesis
- Skin and hair: Zinc is essential for keratinocytes; deficiency leads to dermatitis and hair loss
- Spermatogenesis: Sperm have very high zinc concentrations; zinc protects sperm from oxidative stress
- Sense of smell and taste: Zinc is a cofactor for gustin (taste protein) – zinc deficiency causes loss of taste
- Insulin synthesis: Zinc is required for the storage of insulin in pancreatic β-cells
Comparison of Zinc Forms
| Form | Elemental Zinc | Bioavailability | Tolerability |
|---|---|---|---|
| Zinc bisglycinate | ~13% | ⭐⭐⭐⭐⭐ | ⭐⭐⭐⭐⭐ Best |
| Zinc citrate | ~31% | ⭐⭐⭐⭐ | ⭐⭐⭐⭐ |
| Zinc gluconate | ~14% | ⭐⭐⭐⭐ | ⭐⭐⭐⭐ |
| Zinc sulfate | ~23% | ⭐⭐⭐ | ⭐⭐ Stomach problems |
| Zinc oxide | ~80% | ⭐⭐ | ⭐⭐⭐ |
Dosage and Intake
| Situation | Dose | Important |
|---|---|---|
| General supply | 10–15 mg elemental zinc | Not on an empty stomach (nausea) |
| Immune support | 15–25 mg | With a meal |
| Athletes (increased loss) | 15–25 mg | Preferably in the evening |
| Upper limit | Max. 40 mg/day long-term | More inhibits copper absorption! |
Zinc-Copper Interaction
High-dose zinc inhibits intestinal copper absorption (both compete for the same transporter, metallothionein). For long-term zinc supplementation above 25 mg/day, copper status should be monitored. Many zinc supplements therefore contain some copper (1–2 mg) as a compensatory measure.
Frequently Asked Questions (FAQ)
Does zinc help against colds?
If zinc lozenges (zinc acetate or zinc gluconate, 75+ mg/day) are taken within the first 24 hours after the onset of a cold, the duration of the cold can be shortened by 33–40%. This is one of the strongest pieces of evidence for a single supplement in acute infections.
When is a blood test useful?
Serum zinc is a moderate marker (zinc is rapidly moved from the blood into cells). More reliable: alkaline phosphatase (zinc-dependent enzyme) and hair mineral analysis. In case of persistent symptoms (hair loss, susceptibility to infection, poor wound healing), always consult a doctor.
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