Zinc for Immune Support: Two Winter Nutrients Worth Considering
When winter arrives, most people start thinking about vitamin C, hot herbal teas, early nights and trying to stay on top of the winter bugs. There are two nutrients I believe are worth paying closer attention to during the colder months: zinc and vitamin D.
Zinc plays an important role in supporting normal immune system function. It helps stimulate a healthy immune system response, supports skin health, contributes to antioxidant and may help reduce common cold duration.
Vitamin D is another nutrient many people think about in winter, especially when sunlight exposure is lower. It helps maintain immune system health, while also supporting muscle function and bone mineralisation.
At Veritroo, we always look at supplements as part of the bigger picture. They do not replace good food, sleep, sunlight, movement or recovery but when used in conjunction with a healthy lifestyle, the right nutrients can help support the foundations your body relies on everyday.
In this article, we will explain why zinc matters for immune support, what the evidence says about zinc and the common cold, and why vitamin D is another nutrient worth considering through winter.
Why Zinc Matters for Immune Support
Zinc is an essential trace mineral that means your body only needs it in small amounts, but those small amounts matter. Unlike some nutrients, the body does not have a specialised storage system for zinc. This means zinc needs to be consumed regularly through food or supplementation to help maintain healthy levels.
Zinc is involved in many normal processes in the body including:
- immune system function
- skin health
- wound healing
- antioxidant activity
- reproductive hormone health
When people search for zinc immune support or zinc for immunity, they are usually trying to understand whether zinc actually matters for the immune system. The answer is yes.
To understand why, we need to look at what the immune system actually is. Your immune system is not one single thing. It is a network of cells, tissues, physical barriers and signalling pathways that all need to work together. Zinc helps support that system at a cellular level.
How Zinc Supports Immune Cells
Zinc is involved in the normal function of several immune cells. These include:
- T cells: help coordinate immune responses
- B cells: help produce antibodies
- Natural killer cells: part of the body's innate immune response
- Macrophages: help identify and clear unwanted material
- Neutrophils: part of the body's first-line immune defence
A healthy immune response is not about simply "boosting" the immune system. It is about helping the immune system respond appropriately.
Zinc is involved in immune cell activity, cell signalling and cell division. This helps explain why zinc plays an important role in supporting immune system function and a healthy immune system response. If your zinc intake is low or inconsistent your body may not be getting the steady mineral support it needs for these immune processes.
Zinc, Skin and Your First Line of Defence
When people think about immune support, they often only think about white blood cells but your first line of defence is also physical. Your skin, mouth, throat, gut lining and mucous membranes are all part of the body's natural barrier system. Zinc plays a role in maintaining skin health and supporting wound healing, which is one reason it is such an important mineral for overall health.
This matters because immune support is not just about what happens once something enters the body. It is also about supporting the barriers that help protect the body in the first place. That is where zinc support becomes more interesting.
It is not just an "immune mineral". It is involved in cell repair, tissue integrity and antioxidant activity all supporting the immune system.
Zinc and the Common Cold
Zinc may help reduce the duration of the common cold, this is different from saying zinc prevents colds. A review (Nault et., 2024) looked at 34 studies with 8,526 participants and found that zinc may reduce the duration of cold symptoms by around two days compared with the placebo.
To understand the science, it helps to look at what happens during a common cold. The common cold usually affects the upper respiratory tract, including the nose, throat and airway lining. Once the body recognises what is happening, the immune system needs to respond in a coordinated way. That response involves immune cells, cell signalling, antioxidant activity and the body's natural barrier systems.
From a practical point of view, I would not think of zinc as something you only care about once winter arrives. Zinc is a mineral worth paying attention to consistently because it supports normal immune processes the body relies on everyday.
The Second Winter Nutrient to Consider: Vitamin D
Vitamin D helps maintain immune system health. It also supports muscle function, bone mineralisation and calcium absorption.
One reason Vitamin D becomes a winter topic is that our bodies produce vitamin D when skin is exposed to sunlight. During winter many people spend more time indoors, wear more layers or have less regular sun exposure.
The science behind vitamin D and immune health comes back to vitamin D receptors, often called VDRs. These receptors are found in different tissues throughout the body, including cells involved in immune function. Once vitamin D is made through sunlight exposure or consumed through food or supplements, the body converts it into circulating 25-hydroxyvitamin D. This can then be converted into its active form.
Active vitamin D works through vitamin D receptors and can influence normal gene activity inside immune cells. This is important because immune health relies on communication. Immune cells need to recognise signals, respond appropriately and coordinate with other cells as part of a healthy immune response.
Research (Saponaro et., 2020) has shown that immune cells such as monocytes and macrophages express vitamin D receptors. Active vitamin D can influence genes involved in normal immune response pathways, including genes linked to body's immediate response to immune challenges.
A better way to think about it that vitamin D helps maintain immune system health by supporting normal immune-cell activity, communication and regulation.
Zinc & Vitamin D: Two Winter Nutrients, Different Roles
Zinc and Vitamin D are both worth considering during winter, but they support the body in different ways.
ZInc is a minerał that helps support immune system function, helps stimulate a healthy immune system response and may help reduce common cold duration.
Vitamin D is a fat-soluble vitamin that helps maintain immune system health, supports muscle function and helps the body absorb calcium for bone health.
Together they can form part of a simple winter wellness routine alongside good food, sleep, hydration, movement and sunlight where possible. At Veritroo, this is how we approach supplementation. We believe in understanding what each nutrient does, why the form matters and how it fits into everyday life. Supplements should support the foundation, not replace them.
Zinc Rich Foods to Include in Your Diet
Food should always come first. Some of the best zinc-rich foods include:
- Oysters
- Beef
- Lamb
- Seafood
- Eggs
- Pumpkin seeds
- Chickpeas
- Cashews
- Whole grains
Oysters are one of the richest natural sources of zinc. Beef and lamb also provide zinc in a form that is generally easier for the body to absorb. Plant foods can still be a valuable source of zinc but they naturally contain phytates, which can bind to minerals and reduce absorption. This simply means people following a plant-based diets may need to be more intentional with zinc intake.
Why the Form of Zinc Matters
Not all zinc supplements are the same. Some zinc supplements use zinc oxide, a common form of zinc. However, zinc oxide is generally considered less bioavailable than forms like zinc glycinate, zinc gluconate or zinc citrate.
Zinc glycinate, also known as bisglycinate, is a chelated form of zinc. This means zinc is bound to glycine, an amino acid. Chelated minerals are commonly used in quality supplement formulas because they are designed to support absorption and be suitable for regular use.
Do You Need a Zinc Supplement?
Not everyone needs a zinc supplement. Many people can meet their zinc needs through a balanced diet. However, the body does not have a specialised storage system for zinc which means regular intake is important to help maintain healthy levels.
A zinc supplement might be worth considering if:
- Your intake of zinc-rich foods is low
- You follow a mostly plant-based diet
- You want a simple way to support your zinc intake during winter
Food should always come first, but supplements can help fill gaps when dietary intake is not consistent.
When Is the Best Time to Take Zinc?
Zinc is generally best taken away from competing minerals such as magnesium, calcium and iron as these can compete for absorption as they share similar transport pathways. For this reason, many people choose to take zinc earlier in the day and magnesium in the evening.
Zinc is ideally taken on an empty stomach for optimal absorption. However some people may experience nausea or stomach discomfort. If that happens, take with a low-phytate meal and avoid taking with calcium rich foods.
Final Thoughts
Winter wellness does not need to be complicated. Zinc helps support immune system function, supports skin health and wound healing, contributes to antioxidant activity and may help reduce the common cold duration. Vitamin D helps maintain immune system health and supports muscle function and bone mineralisation.
Together, zinc and vitamin D are two nutrients worth considering during winter. Alongside the foundations of good food, sleep, hydration, movement and sunlight where possible.
Sometimes the most important nutrients are the ones people forget.
