Summer illness is more common than many people realize. Travel, crowded events, and heat-related lifestyle changes can all increase exposure to viruses while placing extra demands on your body. Although no single nutrient can prevent all illnesses, maintaining good nutritional status helps ensure your immune system is prepared to respond when it's needed. Read on to discover five essential supplements that deserve a place in your summer wellness routine.

Strengthen Your First Line of Defence

With all the fresh fruits and vegetables available right now you might assume you’re getting enough vitamin C, but consider this: increased sun exposure generates more free radicals in the skin, increasing the need for antioxidant protection. Add in travel, heat and physical exertion, and your body may benefit from more consistent vitamin C intake to help support normal immune function.

As an antioxidant, vitamin C is vital to multiple parts of the immune system while helping protect cells from the oxidative stress caused by intense activity, smoke and sun exposure. Vitamin C also supports collagen formation, helping maintain the skin and mucous membranes, such as those lining your nasal passages and tonsils – acting as your body's first line of defence against the entry of bacteria and viruses.

Because vitamin C is water-soluble and can’t be stored for later use, regular intake is important to maintain consistent levels in the body. That’s why Pure Lab’s Slow Release Vitamin C 1000mg Vegi-Caps was developed, for the added benefit of gradual release for longer-lasting benefits. Just like Pure Lab’s regular Vitamin C 1000 mg Vegi-Caps and additive-free Vitamin C Powder, it’s also corn-free and sugar-free.

A Key Mineral for Immune Resilience

Zinc is essential for the development and activity of our immune cells and the integrity of the skin and mucous membranes that act as physical barriers against pathogens like bacteria and viruses. And, since summer often brings insect bites, minor cuts from gardening, scraped knees, and other minor skin injuries, it’s important to note that zinc supports plays an important role in normal wound healing, too.

Even mild zinc insufficiency may affect normal immune function, making it important to meet your daily needs throughout the summer- - not just during cold and flu season.  Top up your zinc daily with the help of Pure Lab’s Zinc Glycinate Vegi-Caps. Each capsule provides 23 mg of a highly bioavailable form of zinc that's gentler on the stomach, helping support healthy immune function year-round.

Summer Sun Isn’t Always Enough

Although we produce vitamin D when our skin is exposed to sunlight, many Canadians still don't achieve optimal vitamin D status because of busy, indoor schedules. When combined with factors like sunscreen use, darker skin pigmentation, and aging, it can be challenging to produce enough of this important vitamin.

Vitamin D helps regulate immune responses and supports the normal function of immune cells. That’s why maintaining healthy vitamin D levels throughout the year—not just during winter—is an important part of supporting normal immune function.

Since very few everyday foods are natural sources of vitamin D, supplementation may be the easiest way for you to maintain levels. Check out Pure Lab’s Vitamin D3, available in 1000 IU and 2500 IU Vegi-Caps, as well as Vegan 1000 IU and Vegan 2500 IU formulations. This dry, powdered form of vitamin D3 is our number one choice for improved stability, giving longer-lasting benefits from each bottle.

Support Respiratory Wellness

Wildfire smoke, smog, high humidity, and seasonal air pollution can all place extra stress on your respiratory system—especially if you spend a lot of time outdoors. Fortunately, n-acetyl-l-cysteine (NAC) has been well-studied for its ability to help support respiratory health during periods of poor air quality. This is particularly important if you already suffer from asthma, or other forms of COPD (chronic obstructive pulmonary disease).

NAC also serves as a nutritional precursor to glutathione, one of the body's most important antioxidants. By helping replenish glutathione levels, NAC supports your body's natural antioxidant defences and helps protect cells from oxidative stress. This is particularly important because both environmental exposures and normal immune activity generate reactive molecules that the body must continually keep in balance.

Whether you're hiking, working, travelling, or socializing outdoors, supporting your respiratory health can help you stay comfortable and ready to enjoy the season. Consider using a NAC supplement such as Pure Lab’s NAC 600 mg Vegi-Caps if these activities resonate with you. Note that it’s normal for high-quality NAC to smell strongly of sulfur when you first open the bottle; this will gradually dissipate over time.

A Small Mineral with a Big Role

Selenium may be a trace mineral, yet it has a large impact on our health. It contributes to the normal function of our immune cells and works alongside other antioxidant nutrients, including vitamin C, to help maintain a healthy internal environment during periods of physiological stress - -such as during strenuous activity, dehydration, and hot weather.

Selenium forms part of several antioxidant enzymes, like glutathione peroxidase ---helping protect cells from oxidative damage while supporting normal immune responses. Because selenium content varies considerably in foods depending on soil conditions, intake can differ widely between individuals.  Be sure to use a biologically active form of selenium, like Pure Lab’s Selenomethionine 200 mcg Vegi-Caps for readily absorbable antioxidant support.

Support Your Immunity This Summer—And Beyond

Summer is meant to be enjoyed, and the right nutritional support can help you make the most of it. Vitamin C, vitamin D, zinc, N-acetyl-L-cysteine (NAC) and selenium each play unique roles in supporting normal immune function, antioxidant defences, and respiratory health. By topping up these nutrients now, you can help support your immune system through the remainder of summer and prepare for the transition into the busier fall season at the same time.

References

Bartley J. Vitamin D, innate immunity and upper respiratory tract infection. J Laryngol Otol. 2010;124(5):465-469.

Dekhuijzen PN, van Beurden WJ. The role for N-acetylcysteine in the management of COPD. Int J Chron Obstruct Pulmon Dis. 2006;1(2):99-106.

Dodd S, Dean O, Copolov DL, Malhi GS, Berk M. N-acetylcysteine for antioxidant therapy: pharmacology and clinical utility. Expert Opin Biol Ther. 2008;8(12):1955-1962.

Guillin OM, Vindry C, Ohlmann T, Chavatte L. Selenium, Selenoproteins and Viral Infection. Nutrients. 2019;11(9):2101. Published 2019 Sep 4.

Hunter J, Arentz S, Goldenberg J, et al. Zinc for the prevention or treatment of acute viral respiratory tract infections in adults: a rapid systematic review and meta-analysis of randomised controlled trials. BMJ Open. 2021;11(11):e047474. Published 2021 Nov 2. 

Lee PH, Hong J, Jang AS. N-acetylcysteine decreases airway inflammation and responsiveness in asthma by modulating claudin 18 expression. Korean J Intern Med. 2020;35(5):1229-1237.

Lin P-H, Sermersheim M, Li H, Lee PHU, Steinberg SM, Ma J. Zinc in Wound Healing Modulation. Nutrients. 2018; 10(1):16.

National Institutes of Health. Office of Dietary Supplements. Vitamin C: Fact Sheet for Health Professionals. Accessed online November 2022.

Schiff. “Should You Take Vitamin C in the Summer?”. Accessed online July 20, 2026.