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Your Immune System Works Hard Every Day. Here Is How to Support It.
Most of us only think about our immune system when we are already sick. The scratchy throat arrives on a Monday morning, or the sniffles show up right before a trip. But the immune system is not a light switch you flip on in an emergency. It is a complex, ongoing operation that requires the right nutritional building blocks to function at its best every single day.
The foundation is non-negotiable: a diet rich in vegetables and whole foods, regular exercise, quality sleep, and real strategies for managing stress. Supplements are not a shortcut around those basics. But they can meaningfully fill in the gaps, especially for nutrients that are hard to get from food alone, or for people whose bodies need a little extra support. If you want to build your immune system from the food side first, start with our guide to the best immune-boosting foods to stock your pantry with.
We put together this list of 12 well-researched vitamins, herbs, and supplements shown in studies to support healthy immune function. Whether you are building a daily wellness routine or looking to stay resilient through cold and flu season, these are the ones worth knowing about.
You can find every supplement in this post at DailyVita.com, our curated Better Living page where readers get 10% off their order. DailyVita carries over 2,000 products, ships to more than 150 countries, and focuses exclusively on GMP-certified, non-GMO, and natural brands.
Note: Supplements support overall wellness but are not a substitute for medical care. Consult your healthcare provider before starting any new supplement, especially if you take medications or have an existing health condition.
1. Vitamin D
Vitamin D, often called the sunshine vitamin, is one of the most critical nutrients for a well-functioning immune system and one of the most common deficiencies in adults. It helps activate the fighting power of white blood cells, reduces inflammation throughout the body, and plays a key role in maintaining healthy bones alongside immune function.
The challenge is that our bodies produce vitamin D through sun exposure and most of us simply do not get enough of it. Older adults, people with darker complexions, anyone living in a northern climate, and people who work indoors are particularly at risk for deficiency. While vitamin D is found in foods like salmon, shrimp, egg yolks, and fortified dairy products, it is very difficult to hit optimal levels through food alone. We have a full guide to the best foods to boost your vitamin D if you want to start there. A daily supplement is the most reliable solution, and having your levels checked by a doctor first is a smart move. The right dose depends on where you are starting from.
Shop it: Now Foods D3 at DailyVita
2. Vitamin C
Vitamin C is an essential nutrient our bodies cannot produce or store, which means we need it consistently from food and supplements. As a powerful antioxidant, it protects cells from free radical damage, enhances the function of immune cells, and helps the body produce new white blood cells that fight infection. It is found in abundance in citrus fruits, strawberries, bell peppers, leafy greens, and tomatoes.
Studies have shown that regular vitamin C supplementation may help shorten the duration and reduce the severity of cold symptoms, and that higher doses may benefit people under significant physical stress. For an easy daily hit of C with added B vitamins and minerals, we love Effer-C Drink Mix, a fizzy orange powder that provides 1,000mg of vitamin C in one convenient pouch.
Shop it: Effer-C Drink Mix at DailyVita
3. Elderberry
Elderberry has been used medicinally for centuries, and modern research is starting to catch up with what traditional herbalists have long known. The small, dark berries of the Sambucus tree are packed with vitamin C, vitamin A, B6, potassium, iron, calcium, fiber, and powerful antioxidants called anthocyanins that give them their deep color and much of their immune-supporting punch.
In a Norwegian study, patients experiencing flu-like symptoms who were given elderberry syrup reported their symptoms subsiding four days earlier than those given a placebo. A review of four studies found elderberry supplements effective in reducing the symptoms of viral upper respiratory infections. (1) Available in capsules, lozenges, and liquid syrups, elderberry is a great option for the whole family to keep on hand through cold and flu season. If you want to get creative, try our homemade Immune-Boosting Elderberry Gummies, a real food recipe the whole family will actually want to eat.
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Now Foods Elderberry Liquid at DailyVita
Now Foods Elderberry Liquid for Kids at DailyVita
4. Zinc
Zinc is one of the most important minerals for immune health, period. People who are deficient in zinc get sick more frequently and recover more slowly, and research consistently shows why: zinc is involved in over 300 enzymatic reactions in the body. It activates immune-fighting cells, helps enzymes break down proteins in bacteria and viruses to make them less infectious, and plays a key role in wound healing, blood sugar regulation, and skin health.
Studies have conclusively shown that daily zinc supplementation reduces the occurrence of the common cold, and that zinc taken within 24 hours of the first symptoms significantly reduces their length and severity. (2) For a convenient combination of zinc, vitamin C, and elderberry in one easy lozenge, the Sambucus Zinc-C from Now Foods is a smart, multi-benefit choice.
Shop it: Sambucus Zinc-C Lozenges at DailyVita
5. Pau d’Arco
Made from the inner bark of an evergreen tree native to the Amazon Rainforest, Pau d’Arco has been used in South American traditional medicine for centuries to address inflammation, pain, and infection. Scientists have now isolated two key antimicrobial compounds in Pau d’Arco, lapachol and beta-lapachone, that have shown antibacterial, antiviral, antifungal, and anti-inflammatory effects in studies. (3)
The beta-lapachone compound specifically interferes with enzymes that allow viruses to replicate and infect cells. Pau d’Arco is also naturally high in selenium, a mineral with well-documented antioxidant and immune-regulating properties. It is available in capsules, liquid extract, and tea. The inner bark is considered the most potent form. Start with a low dose as some people experience nausea initially, and avoid if you are on blood thinners.
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Pau d’Arco 500mg Capsules at DailyVita
Now Pau d’Arco Tea (Caffeine Free) at DailyVita
Pau d’Arco Extract at DailyVita
6. Olive Leaf Extract
From the same trees that give us heart-healthy olive oil, extract from olive leaves is a concentrated source of antioxidants with a long list of studied health benefits. The active compound, oleuropein, has been found in research to be antibacterial, antifungal, anti-inflammatory, and a potent immune booster with antiviral properties.
Research suggests that olive leaf extract may inhibit the ability of viruses responsible for the common cold, flu, and certain respiratory infections to replicate. Studies have also shown that it may enhance the body’s immune response to infection by stimulating activity against viral pathogens. (4) It is one of the more underrated supplements on this list and one worth adding to a daily routine.
Shop it: NOW Olive Leaf Extract at DailyVita
7. Colostrum
Colostrum is the nutrient-dense liquid produced in the first days after birth, and it is not just for newborns. Packed with proteins, vitamins, minerals, antimicrobial peptides, and immunoglobulins (the protein antibodies your immune cells use to neutralize infectious invaders), colostrum is one of nature’s most complete immune-support compounds. (5)
A 2014 study found that colostrum strengthens natural killer (NK) cells, the immune system’s frontline responders against viruses and respiratory infections. It also contains lactoferrin, a compound that helps repair the gut lining while binding to toxins produced by microbes. (6) Bovine colostrum is widely available in supplement form and is considered a food rather than a pharmaceutical. Those with dairy allergies should check with a doctor first; lactose sensitivity is generally not an issue.
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NOW Foods Colostrum at DailyVita
NOW Foods Super Colostrum at DailyVita
8. Garlic
Garlic is one of the most studied natural antimicrobials on the planet, and its immune benefits go far beyond flavor. Every time fresh garlic is crushed or chopped, a compound called alliin converts into allicin, an unstable sulfurous compound responsible for garlic’s signature scent and its powerful antibacterial, antifungal, and antiviral properties. Research suggests garlic enhances immune response by stimulating protective immune cells that guard against viral infections. (7)
One notable study found that people taking garlic over a three-month period had a 63% lower risk of catching a cold. Those who did catch one recovered 70% faster than the control group. (8) The catch: heat deactivates allicin, which is why raw garlic is more potent than cooked. If eating raw garlic is not your thing, a high-quality garlic supplement delivers the same benefits. For another natural antimicrobial worth keeping in your routine, read about the scientifically backed benefits of manuka honey.
Shop it: Now Garlic Oil Triple Strength at DailyVita
9. Peppermint
Most people think of peppermint as a breath freshener or a pleasant cup of tea. But this herb is significantly more than that. Peppermint is high in antioxidants and has well-documented antibacterial, antiviral, and anti-inflammatory properties. (9) Studies have shown that peppermint oil can kill bacteria linked to Staphylococcus infection and pneumonia, and has demonstrated antiviral activity against influenza A. (10)
When respiratory congestion is the issue, the menthol in peppermint acts as a natural decongestant. It shrinks swollen nasal membranes, makes breathing easier, and helps loosen mucus in the lungs. (11) Try breathing steam with a few drops of peppermint essential oil when congestion hits, or simply drink a cup of peppermint tea daily as part of your routine. For a delicious way to get peppermint and other immune-supporting ingredients all at once, try our Immune-Boosting Beet-Turmeric Refresher, made with green tea, ginger, turmeric, and manuka honey.
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Now Peppermint Gels at DailyVita
Now Organic Peppermint Tea at DailyVita
10. Dandelion Root
The dandelion in your yard is not a weed. It is a highly nutritious plant with centuries of medicinal use behind it. Commonly used today as a liver and gallbladder cleanser, dandelion root also carries promising antimicrobial and antiviral properties that are now being studied more closely by researchers.
Test-tube studies have shown dandelion extract may be effective against certain viral infections, with some research indicating it can block viruses from replicating themselves. (12, 13) It is also a rich source of vitamins A, C, and K, and contains significant antioxidants. Available in capsules or as a pleasant caffeine-free tea, dandelion root is an easy and underrated addition to a wellness routine. Pair it with our Apple Cider Vinegar Wellness Tonics for a solid daily detox and immune-support habit.
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Now Dandelion Root at DailyVita
Now Organic Dandelion Tea (Caffeine Free) at DailyVita
11. Licorice Root
Licorice root has been used in traditional Chinese medicine for thousands of years, and modern science is beginning to explain why. With over 300 active compounds, licorice root has demonstrated antiviral properties in studies, including the compounds glycyrrhizin, liquiritigenin, and glabridin, which have shown activity against certain viruses and bacteria. (14)
Test-tube studies have shown licorice root extract to be active against herpes, HIV, and the SARS coronavirus. (15) It is important to note these are preliminary findings, and licorice root can interact with certain medications and health conditions, particularly those involving blood pressure. Always check with your doctor before adding licorice root to your routine.
Shop it: Now Foods Licorice Root at DailyVita
12. Panax Ginseng
Known as Asian or Korean Ginseng, Panax Ginseng has been used in traditional Chinese medicine for over 5,000 years as a restorative herb. Modern research has validated many of its traditional uses, particularly its immune-boosting effects. Studies show that Panax Ginseng enhances natural killer cell activity, increases white blood cell count and overall immune response, and reduces the occurrence of colds and flu. (16, 17, 18)
Research has also shown that Panax Ginseng can enhance the efficacy of flu vaccines when taken alongside them. In one study, patients with bacterial bronchitis who were treated with ginseng alongside antibiotics recovered significantly faster than those treated with antibiotics alone. (19) Beyond immune health, it is widely studied for improving mental clarity, energy, and stamina making it one of the most versatile supplements on this list.
Shop it: Now Foods Panax Ginseng at DailyVita
Where to Shop: Get 10% Off Your DailyVita Order
You can find every supplement in this post, and hundreds more, at DailyVita.com/better-living, our curated Better Living page. DailyVita carries over 2,000 natural health products from GMP-certified brands, ships to over 150 countries, and offers 24/7 customer support. Readers get 10% off their entire order through our Better Living link.
DailyVita’s product line includes vitamins and minerals, herbal supplements, sports nutrition, natural and organic foods, beauty and personal care, essential oils, and pet supplements. All products are focused on quality, purity, and transparency. It is our kind of store.
Frequently Asked Questions
Which immune support supplements should I take every day?
Vitamin D and zinc are the two most commonly deficient nutrients in adults and the most consistently linked to immune function in research. Elderberry and vitamin C are better suited as seasonal or situational supplements, particularly during cold and flu season or when you feel run down. Garlic and Panax Ginseng work well as daily adaptogens if you are building a long-term wellness routine.
Can you take all of these supplements at once?
Not necessarily, and more is not always better. Start with one or two based on your specific needs, get your vitamin D level tested if you have not, and build from there. Some supplements interact with medications. Licorice root and Pau d’Arco in particular require a conversation with your doctor if you are on any prescription drugs or blood thinners.
Are these supplements safe for kids?
Elderberry liquid formulated for kids (like the Now Foods Kids version), vitamin C, and zinc in age-appropriate doses are generally considered safe for children. Always use products formulated for the appropriate age range and consult a pediatrician before starting any supplement regimen for a child.
When is the best time to take immune supplements?
Fat-soluble vitamins like vitamin D are best taken with a meal that contains some fat for absorption. Zinc is best taken with food to avoid stomach upset. Water-soluble supplements like vitamin C can be taken any time. Herbal supplements like Panax Ginseng are often taken in the morning since some people find them energizing.
Do immune supplements actually work?
The research is clearest for vitamin D, vitamin C, zinc, and elderberry, all of which have well-supported evidence for immune function. The others on this list have promising research behind them, though more large-scale clinical trials are ongoing. The honest answer is that supplements work best when they are filling a real nutritional gap or providing targeted support, not as a substitute for a healthy diet and lifestyle.
Build Your Immune Routine
A strong immune system is built year-round, not scrambled together when the first sniffle hits. The supplements on this list are some of the best-researched tools available to support your body’s natural defenses, and all of them are available in one place.
Head to our Better Living page at DailyVita for 10% off your order and browse the full collection of natural supplements, vitamins, and wellness products we stand behind.
Want to keep building your immune toolkit? Here is more from Better Living:
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