Get Ahead of Winter: Why Zinc, Vitamin D and Quercetin Matter After 45

Winter can feel different after 45. The colder months often bring more time indoors, less sunlight, busier family commitments, and a stronger focus on staying well enough to keep doing the things that matter.

That is why a proactive winter routine can be so valuable. Rather than waiting until you feel run down, the goal is to support your body’s normal immune defences consistently through the season.

Lifeguard Immune was formulated with this in mind: a daily supplement for adults over 45, bringing together selected immune-support ingredients including zinc, vitamin D3 and quercetin.

Why winter immune support matters after 45

Many adults become more aware of their immune health in midlife. Recovery can feel slower, routines can be harder to maintain, and the basics — sleep, nutrition, sunlight, movement and stress control — become more important than ever.

A good winter plan should always start with the foundations: a balanced diet, regular movement, good sleep, hydration and time outdoors where possible. For a broader guide, read our article on how to support your immune system naturally.

But even with the best intentions, winter can make consistency harder. That is where targeted supplementation may help fill nutritional gaps as part of a broader healthy routine.

Zinc: the immune-support mineral worth keeping topped up

Zinc is one of the key nutrients your body uses to support normal immune system function.

One reason zinc matters is that it does not sit around in the body in large reserves for long-term use. In Dr Mulgan’s words, zinc “doesn’t like to hang around too long in the body” — which means regular intake through diet or supplementation is important.

Food should always come first. Zinc is found in foods such as meat, seafood, legumes, nuts and seeds. However, many people do not eat an ideal diet every day, especially during busy or colder months.

Lifeguard Immune includes zinc as one of its key ingredients, alongside seven other selected nutrients and botanicals for daily immune support.

Vitamin D: the sunshine vitamin that becomes harder to maintain in winter

Vitamin D is often called the sunshine vitamin because your skin uses sunlight to help make it.

In autumn and winter, this can become more difficult. Shorter days, colder weather, indoor routines and sunscreen use can all reduce regular sunlight exposure. Older adults may also need to pay closer attention to vitamin D as part of a healthy ageing routine.

Vitamin D supports normal immune system function, which is why vitamin D3 is included in Lifeguard Immune.

For more on this topic, read our guide to vitamin D for over 50s in New Zealand.

Quercetin: the plant-derived ingredient many people have not heard of

Quercetin is a plant-derived flavonoid found naturally in a range of fruits and vegetables. It is less familiar than zinc or vitamin D, but it is one of the ingredients that helps make Lifeguard Immune more than a simple single-nutrient supplement.

Dr Mulgan’s campaign notes describe quercetin and zinc as a useful pairing within an immune-support formulation. This is one of the reasons Lifeguard Immune includes both ingredients together as part of its broader daily formula.

The aim is not to rely on one “hero” ingredient, but to create a practical routine that supports normal immune function through the winter months.

Lifeguard Immune: 8 ingredients, one winter routine

Lifeguard Immune combines:

• Vitamin C
• Vitamin D3
• Zinc
• Selenium
• Copper
• Elderberry
• Andrographis
• Quercetin

These ingredients have been selected to support immune health as part of a daily routine for adults over 45.

If you are comparing options, you may also find our doctor-led guide useful: Best immune supplements for over 50s in NZ.

Why consistency matters

Immune support is not something most people can fix with one good meal or one supplement taken occasionally. The benefit comes from routine: eating well, sleeping well, moving regularly, managing stress, and keeping key nutrients topped up over time.

That is especially relevant in winter, when routines are often disrupted and many people spend less time outdoors.

For more context, read our guide to immune resilience in midlife, or our broader doctor-led supplement guide for adults over 40.

The bottom line

After 45, winter is a good time to be more deliberate about immune support.

Zinc, vitamin D3 and quercetin each play a role in Lifeguard Immune’s 8-ingredient formula, but the bigger idea is simple: build a daily routine before winter takes hold.

Start with the basics. Eat well, sleep well, move regularly, get daylight when you can, and consider targeted supplementation where it makes sense for your lifestyle.

Always read the label and use as directed. Vitamins and minerals are supplementary to, and not a replacement for, a balanced diet.