Best Immunity Supplements (2026)

1

Vitamin D

Fat-soluble secosteroid vitamin synthesized in skin upon UVB exposure. Functions as a hormone affecting calcium homeostasis and bone health.

Found in 116 products· Essential for calcium absorption and bone health, Supports immune system function

2

Vitamin C

Vitamin C boosts immunity, promotes collagen production for healthy skin, and enhances iron absorption. As a powerful antioxidant, it helps protect cells from damage and speeds up wound healing. Citrus fruits and supplements are great sources.

Found in 109 products· Enhances collagen synthesis

3

Zinc

Essential trace mineral critical for immune function, wound healing, protein synthesis, and DNA synthesis.

Found in 89 products· Essential for immune system function, Supports wound healing

4

Vitamin A

Fat-soluble vitamin essential for vision, immune function, and cellular communication. Exists as preformed vitamin A (retinoids) in animal products and provitamin A (carotenoids) in plants.

Found in 57 products· Supports healthy vision, especially night vision, Essential for immune system function

5

Selenium

Essential trace mineral critical for antioxidant defense (selenoproteins), thyroid hormone metabolism, and immune function.

Found in 35 products· Powerful antioxidant as component of glutathione peroxidase, Essential for thyroid function

6

Astragalus

Astragalus membranaceus (Huang Qi) is a foundational herb in Traditional Chinese Medicine used for over 2,000 years. It contains active compounds including astragalosides, polysaccharides, and flavonoids. Research highlights its immunomodulatory, anti-aging (telomerase activation), and cardioprotective properties.

Found in 4 products· [object Object], [object Object]

7

Reishi

Reishi (Ganoderma lucidum), the "Mushroom of Immortality," has been used in East Asian medicine for 2,000+ years. Active compounds include ganoderic acids (triterpenes), beta-glucan polysaccharides, and germanium. One of the most well-researched medicinal mushrooms, with over 400 bioactive compounds identified.

Found in 3 products· [object Object], [object Object]

8

Elderberry

Elderberry (Sambucus nigra) is a traditional immune-supporting berry rich in anthocyanins and flavonoids. Clinical trials demonstrate significant reduction in cold and flu duration and severity. Active compounds inhibit viral hemagglutinin and boost cytokine production.

Found in 3 products· [object Object], [object Object]

9

Garlic

Garlic (Allium sativum) contains allicin and organosulfur compounds with potent cardiovascular, antimicrobial, and anti-cancer properties. Aged garlic extract (AGE) provides more stable and bioavailable S-allyl cysteine. One of the most researched herbal supplements with over 5,000 peer-reviewed publications.

Found in 2 products· [object Object], [object Object]

10

Echinacea

Echinacea (primarily E. purpurea and E. angustifolia) is a widely used medicinal herb for immune support. Active compounds include alkamides, cichoric acid, and polysaccharides that activate macrophages, NK cells, and modulate cytokine production. Meta-analyses support reduced cold duration and incidence.

Found in 2 products· [object Object], [object Object]

11

Lactobacillus acidophilus

Lactobacillus acidophilus is the most widely studied probiotic bacterium. It colonizes the small intestine, produces lactic acid and bacteriocins, and supports gut barrier integrity. Clinically validated for IBS, antibiotic-associated diarrhea, vaginal health, and immune modulation.

Found in 1 products· [object Object], [object Object]

12

N-Acetyl Cysteine (NAC)

N-Acetyl Cysteine (NAC) is the acetylated form of L-cysteine with superior bioavailability. It is the most effective oral precursor to glutathione and has been used clinically for 50+ years. FDA-approved as acetaminophen antidote; extensively researched for respiratory, mental health, liver, and immune applications.

Found in 1 products· [object Object], [object Object]

13

Chaga

Chaga (Inonotus obliquus) is a medicinal fungus that grows on birch trees in cold climates. It contains exceptionally high levels of antioxidants (ORAC score among the highest of any food), melanin, betulinic acid, and beta-glucans. Traditionally used in Siberian and Scandinavian folk medicine for immune support and vitality.

Found in 0 products· [object Object], [object Object]

14

Lactoferrin

Lactoferrin is a multifunctional iron-binding glycoprotein found in milk, tears, and saliva. It is one of the most potent natural antimicrobial and immune-modulating proteins. It binds free iron (depriving pathogens), directly disrupts bacterial membranes, and modulates immune cell activity.

Found in 0 products· [object Object], [object Object]

15

Turkey Tail

Turkey tail (Trametes versicolor) contains PSK (polysaccharide-K/Krestin) and PSP (polysaccharopeptide), two of the most clinically studied immunological agents from any mushroom. PSK has been approved as an anti-cancer drug in Japan since 1977, used adjunctively with chemotherapy for gastric and colorectal cancers.

Found in 0 products· [object Object], [object Object]