Micronutrient of the Month: Zinc

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Your Good Farm in-house nutritionist. Here to bring you essential information on nutrition, diet and permaculture gardening - in a bite size, easy to understand, science-backed way.

Micronutrient of the Month: Zinc

Zinc is fundamental to immune defence, tissue repair, hormone balance and cognitive function. It is required for hundreds of enzymatic reactions and sits within a narrow window of optimal balance. Too little zinc impairs immunity, skin integrity and recovery, while excessive or poorly balanced supplementation can disrupt copper status, digestion and microbial balance.

For an overview of micronutrients and nutrient density, refer to our first article in this series on magnesium (read here), which outlines the foundational principles that apply across this micronutrient series.

Zinc’s role in the body

Zinc is central to repair, regeneration and immune resilience. It supports both innate and adaptive immune responses, helping the body respond appropriately to infection while regulating inflammation.

Zinc also supports:
• Immune function and infection resistance
• Skin health, wound healing and tissue repair
• Thyroid and reproductive hormone function
• Taste and smell perception
• DNA synthesis and cell turnover
• Cognitive function and mood regulation
• Growth and development during pregnancy and childhood

Why zinc deficiency is so common

Zinc deficiency is more common than often recognised, particularly in individuals with increased demand, impaired digestion or diets that limit bioavailability (refer to last weeks article on bioavailability (link here)).

Increased physiological demand
Pregnancy, breastfeeding, adolescence, rapid growth, infection and chronic stress all increase zinc requirements.

Reduced absorption
Low stomach acid, gut inflammation, coeliac disease, IBS and long-term use of acid-suppressing medications can impair zinc absorption.

Dietary patterns
Diets high in refined foods or reliant on plant sources without traditional preparation methods may reduce zinc availability due to phytates, which bind minerals and reduce their absorption.

Increased losses
Frequent sweating, intense training, alcohol intake and chronic illness can increase zinc losses.

Zinc depletion often develops gradually and may go unnoticed until function is affected.

Common signs of low zinc

Symptoms are often nonspecific and easily attributed to other factors:

• Frequent infections or poor immune resilience
• Slow wound healing
• Hair thinning or increased shedding
• Acne, dermatitis or poor skin integrity
• Reduced sense of taste or smell
• White marks on nails
• Low appetite
• Impaired growth in children
• Reduced libido or hormonal imbalance

These symptoms are not unique to zinc deficiency. Gut dysfunction, inflammation, stress and other nutrient imbalances can present in similar ways, which is why clinical context is important.

Zinc status and testing

Zinc is primarily intracellular, making assessment less straightforward than other nutrients. Plasma or serum zinc can offer some insight, but levels are influenced by infection, inflammation, stress and time of day. It is also important to recognise that standard blood pathology is not always the most reflective measure of total body nutrient status. The body works constantly to maintain homeostasis, often pulling nutrients from tissues and stores to keep blood levels within range.

As a result, someone may experience signs of suboptimal zinc status despite results appearing “normal” on standard pathology.

More functional assessment methods may sometimes provide additional insight, including urinary testing, dietary analysis and clinical evaluation alongside symptoms and case history.

Assessment is often guided by:
• Clinical presentation
• Dietary intake and digestive capacity
• Interactions with other minerals, particularly copper

As with other micronutrients, pathology ranges are broad and primarily designed to identify overt deficiency or disease states rather than optimal function. Results are most meaningful when interpreted alongside symptoms, dietary patterns, digestive health and overall context.

Zinc-rich foods, absorption enhancers and inhibitors

Zinc intake is only one part of the picture. Absorption is shaped by food form, preparation and digestive function.

Key food sources

Note on oysters
Oysters are one of the most concentrated sources of zinc available. Small amounts can significantly support intake.

Factors that enhance absorption

Traditional preparation reduces phytate content and improves mineral availability.

Factors that inhibit absorption

Digestion and nervous system state

Zinc absorption relies on adequate stomach acid and digestive capacity. Chronic stress, rushed eating and eating on the go reduce digestive efficiency and mineral uptake.

Supporting digestion and eating in a calm, parasympathetic state can often improve zinc status without increasing intake.

Zinc supplementation in clinical practice

Zinc is commonly supplemented in forms such as sulfate, gluconate and picolinate, with varying tolerance and absorption.

Zinc bisglycinate, a chelated form, is generally better tolerated and more efficiently absorbed, particularly where digestive function is compromised.

Long-term or high-dose supplementation requires care and professional guidance, as zinc can reduce copper levels and disrupt mineral balance if not appropriately managed.

General guidance for supplementation:
Avoid taking zinc alongside:
• Iron supplements
• High-dose calcium or magnesium
• Multimineral formulas
• High-phytate meals

Zinc is often better tolerated when taken with food, unless otherwise directed.

Dosing is best individualised based on symptoms, dietary intake, digestive function and overall mineral balance rather than applied as a standard protocol.

The Takeaway

Focusing on a food-first approach that supports digestion, improves absorption, and respects nutrient interactions provides the most sustainable path to maintaining healthy zinc status. If zinc deficiency is suspected, it is best to seek guidance from a naturopath, nutritionist, or integrative healthcare practitioner regarding therapeutic supplementation.

As always The Good Farm meals are here to support your well being if you are time poor. Our slow cooked animal produce and home made bone broths are the base of many of our meals and are always made with your health front of mind. 

If there is a specific micronutrient you would like us to explore in future articles, we welcome your suggestions and feedback in the comments.

Disclaimer

This article is for general educational purposes only and does not replace personalised medical or nutritional advice. Individual zinc requirements vary depending on health status, life stage and dietary patterns. Consult a qualified healthcare practitioner before supplementing, particularly during pregnancy, breastfeeding or when managing a medical condition.

Reference List

King JC et al. Zinc: an essential micronutrient. American Journal of Clinical Nutrition.

Hess SY et al. Zinc deficiency and immune function. Nutrients.

Prasad AS. Zinc in human health: effect on immune cells. Molecular Medicine.

Gibson RS et al. Dietary zinc, phytate and mineral bioavailability. Advances in Nutrition.

Maares M, Haase H. Zinc and immunity: an essential interrelationship. Archives of Biochemistry and Biophysics.

Hambidge KM, Krebs NF. Zinc deficiency: a global challenge. Journal of Nutrition.

Read SA et al. The role of zinc in antiviral immunity. Advances in Nutrition.

Wessells KR, Brown KH. Estimating the global prevalence of zinc deficiency. PLoS One.