Zinc
Zinc is a trace mineral involved in more biological processes than almost any other — immune function, wound healing, protein synthesis, DNA production, cell division, taste and smell perception, and reproductive health among them. It’s also one of the more commonly deficient minerals globally, sitting behind iron as the second most prevalent mineral deficiency worldwide.
The immune connection is the one most people know. Zinc is genuinely important for immune defense — it’s required for the development and function of immune cells, and deficiency meaningfully impairs the immune response. The evidence for zinc supplementation reducing the duration of the common cold, when taken at the onset of symptoms, is among the more credible in the nutritional supplement literature. This is a case where the popular association between zinc and immune health has actual research behind it, unlike many supplement claims.
Zinc is found in meaningful amounts in animal foods — oysters are the most concentrated source by a significant margin, followed by red meat, poultry, and seafood. Plant sources like legumes, nuts, seeds, and whole grains contain zinc but also phytates, compounds that bind to zinc and reduce its absorption. People eating plant-based diets absorb zinc less efficiently than those eating animal foods and need to consume more of it to meet their needs. Soaking and sprouting legumes and grains reduces phytate content and improves zinc absorption meaningfully.
As mentioned in the copper section, zinc and copper compete for absorption. Long-term zinc supplementation at high doses can deplete copper stores, which is worth being aware of if supplementing zinc regularly for an extended period.
Reference Card
Mineral type: Trace mineral Pillar: Nourish
What it does for you
- Supports immune function and the development of immune cells
- Essential for wound healing and tissue repair
- Required for protein synthesis and cell division
- Supports taste and smell perception
- Involved in reproductive health and hormone production
Where to get it
- Oysters, beef, lamb, pork, chicken, crab, lobster, pumpkin seeds, hemp seeds, legumes, whole grains, nuts
Considerations
- Plant sources contain phytates that reduce zinc absorption — people eating plant-based diets need more dietary zinc to meet their needs
- Soaking and sprouting legumes and grains reduces phytate content and improves zinc absorption
- Long-term high-dose zinc supplementation depletes copper — worth being aware of if supplementing zinc regularly
- Zinc supplementation at the onset of cold symptoms has reasonable evidence for reducing duration — one of the more credible supplement use cases for immune support
Signs your intake might be low
- Getting sick more frequently than usual
- Slow wound healing
- Loss of taste or smell sensitivity
- Hair thinning
- Skin issues
Common myths
- Zinc supplements are only useful when you’re already sick — adequate ongoing zinc status supports immune function continuously, not just during illness
- Plant-based eaters can’t get enough zinc — they can, but it requires more intentional food choices and preparation methods than for people eating animal foods regularly