A Guide to Advanced Immune Support Ingredients
Most people have heard of vitamins C and D and the mineral zinc for immune support—but those are only part of the picture. Researchers continue to study a wide range of nutrients, botanicals, mushrooms, probiotics, and specialty compounds that help support immune cell function, antioxidant defenses, and the body’s natural protective systems. If you’re looking to go beyond the basics for daily immune support, these are some of the most researched ingredients to know.
Key Terms
- Homeostasis: a stable or balanced internal environment in the body that is conducive to overall health.
- Innate immune response: your body's built-in first line of defense that behaves the same way to all perceived threats or invasions.
- Adaptive immune response: the specialized immune activity that your body gains as it learns and 'adapts' to threats—complementary and second line of defense after the initial innate immune response.
- Antibodies: proteins produced by the immune system to locate and destroy foreign substances including viruses and bacteria perceived as a threat to wellness.
Start with the Foundations
Before exploring specialty ingredients, make sure your nutritional foundation is in place. You can learn about the essentials in Vitamins for Immune System Support.
Botanicals That Support Immune Health
Botanicals—that is, plants or plant-derived materials—most commonly relied on as advanced immune supplements include:
- Echinacea—known for regulating both the innate and adaptive immune system.1
- Elderberry—a natural source of antioxidants and anthocyanins known to influence innate immune cell activity.2
- Andrographis—an immunostimulating plant that promotes both the innate and adaptive immune function in the gut for improved homeostasis and overall wellness.3
- Garlic—promotes immune homeostasis by enhancing the functioning of certain immune cells by various modulatory mechanisms.4
- Olive Leaf—extracts of olive leaf are known to possess high levels of polyphenols associated with regulating the immune system by promoting the creation and activation of specific cells such as natural killers (NK) and T-helpers.5
- Astragalus—helps to regulate immune function by calming overactive responses while modulating proper immune activity.6
Functional Mushrooms
Other advanced immune support supplements may feature what are known as functional mushrooms. These can include:
The immune support delivered by these mushrooms is linked to the beta glucans they provide. Beta glucans are a type of polysaccharide that are associated with antioxidant defense in addition to serving as what’s called a “biological response modulator.” This means that they contribute to the intensity of the body’s immune response by activating innate immune cells and regulating the adaptive immune response.7 By incorporating these mushrooms into your health routine, you can add a boost to your body’s immune response when it’s needed most.
Probiotics and Gut Health
Promoting sustained immune wellness means also keeping your gut health in mind. This is because about 70% of your immune system is located in the gut microbiome, where local immune mucosal responses, epithelial integrity, and microbiota balance all play central roles. In this environment, beneficial (“probiotic”) bacteria including Lactobacillus and Bifidobacterium offer positive support, such as regulating protective immune activity.8 Additionally, beneficial microbiota are known to contribute to what is called gut-associated lymphoid tissue (GALT) within the GI tract. GALT plays a critical role in gut homeostasis and the continual generation of specialized immune cells and antibodies.9
You can promote the proliferation of beneficial bacteria in the gut through the use of probiotic supplements, prebiotic fiber supplements, and the inclusion of probiotic-rich fermented foods in your diet. Read more about probiotics and their benefits in What Are Probiotics? And Why Do I Need Probiotics?
Antioxidants Beyond Vitamin C
Another group of advanced immune supplements beyond vitamins is commonly known as antioxidants and can include:
- NAC— An abbreviation for N-acetyl L-cysteine, a precursor to the powerful antioxidant glutathione.
- Quercetin—bioflavonoid plant pigment delivering antioxidant defense.
- Alpha Lipoic Acid—soluble in both water and fat, this antioxidant vitamin-like chemical operates in multiple parts of the body protecting against oxidative stress.
- Selenium—antioxidant trace mineral that promotes immune function.
These antioxidants provide additional protection to the cells by defending against oxidative stress that can be caused during times of immune activation. During such times, free radicals (reactive compounds featuring an impaired electron in their outer orbital) are formed and may cause harm to the DNA, lipids, or proteins of cells. Antioxidants, including in supplement form, have been shown to offer protection against this harm by providing a stable electron to the free radical molecules, thus rendering them inactive.10
Advanced Nutritional Support
When it comes to supporting immune health, some allies may not immediately come to mind. Among those you might want to integrate into your routine is colostrum. This natural dairy product is packed with antibodies and nutrients for potent immune support. Similarly, lactoferrin is a multifunctional protein also found in milk which offers many benefits, including as an immunomodulator and promoter of immune function.11
As previously mentioned, beta-glucans are excellent immune allies typically found in mushrooms. However, if mushrooms or their supplements aren’t right for you, a beta-glucan supplement may be the next best thing!
One more advanced immune supplement to consider is arabinogalactan, a glyconutrient sourced from larch trees. It’s known for helping to maintain and balance the immune system.
Adaptogens and Everyday Resilience
Stress is known to have profound effects on the body, including the immune system. Although initially it may enhance immune function, stress over time can have undesirable effects throughout the body via the hypothalamic-pituitary-adrenal (HPA) axis.12 For this reason, promoting a healthy stress response is a good way to support proper immune function. Certain adaptogenic herbs are associated with this benefit, including:
To learn more about supplements that offer support during times of stress, check out Top Supplements for Cortisol Levels.
How to Build an Immune Support Routine
Building an effective immune support routine isn’t about taking every supplement available or trying to cover every aspect of wellness at once. Instead, creating a targeted, tailored “stack” of supplements works well for many people. Consider organizing a foundation with nutrients like vitamins C and D and the mineral zinc. From there, personalize your stack with supplements selected to meet your needs.
These might include probiotics for a digestive focus, or perhaps herbs like elderberry and echinacea for seasonal support. For antioxidant defense, consider NAC or quercetin. It’s all about catering to your personal goals.
Conclusion
Selecting the advanced immune support supplements that are right for you beyond the foundations means understanding how different nutrients provide specific benefits to areas like stress response, defense against oxidative stress, and natural sources of potent beta-glucans. For innovative and science-backed support, be sure to check out Swanson’s specialty immune collection and for more on foundational immune support, read Vitamins for Immune System Support.
*These statements have not been evaluated by the Food and Drug Administration. These products are not intended to diagnose, treat, cure, or prevent any disease.
About Lindsey Toth, MS, RD
Lindsey is a nationally recognized registered dietitian and nutritionist with a soft spot for pie. She empowers people to take charge of their health by finding the balance between the pleasure and nourishment in food. Her philosophy is that you should take care of your body because it’s the only permanent home you have. It’s what inspired her to pursue a career in nutrition.
Sources
- Zhai, Z., et al. Enhancement of innate and adaptive immune functions by multiple Echinacea species. J Med Food. 2007 Sep; 10 (3): 423-34.
- Wieland, S., et al. Elderberry for prevention and treatment of viral respiratory illnesses: a systematic review. BMC Complement Med Ther. 2021 Apr 7; 21 (1): 112.
- Tyagi, V., et al. Andrographis paniculata restores gut health by suppressing inflammation and strengthening mucosal immunity. Front Pharmacol. 2025 Apr 2; 16: 1536683.
- Arreola, R., et al. Immunomodulation and anti-inflammatory effects of garlic compounds. J Immunol Res. 2015; 2015: 401630.
- Magrone, T., et al. Olive Leaf Extracts Act as Modulators of the Human Immune Response. Endocr Metab Immune Disord Drug Targets. 2018; 18 (1): 85-93.
- How Astragalus May Help Boost White Blood Cell Counts and Support Immune Regulation. Portland Clinic of Natural Health. (2025) Accessed August 2026.
- Zhong, X., et al. Immunomodulatory Effect and Biological Significance of β-Glucans. Pharmaceutics. 2023 May 29; 15 (6): 1615.
- Wiertsema, P., et al. The Interplay between the Gut Microbiome and the Immune System in the Context of Infectious Diseases throughout Life and the Role of Nutrition in Optimizing Treatment Strategies. Nutrients. 2021 Mar 9; 13 (3): 886.
- Bemark, M., et al. Gut-associated lymphoid tissue: a microbiota-driven hub of B cell immunity. Trends Immunol. 2024 Mar; 45 (3): 211-223.
- Brambilla, D., et al. The role of antioxidant supplement in immune system, neoplastic, and neurodegenerative disorders: a point of view for an assessment of the risk/benefit profile. Nutr J. 2008 Sep 30; 7: 29.
- Kowalczyk, P., et al. The Lactoferrin Phenomenon-A Miracle Molecule. Molecules. 2022 May 4; 27 (9): 2941.
- Alotiby, A. Immunology of Stress: A Review Article. J Clin Med. 2024 Oct 25; 13 (21): 6394.
