Immune Support

Nutrients connected to Immune Support

A link means the body needs the nutrient for this, or that low intake is linked to it. It does not mean extra supplements help if your intake is already adequate; each link shows how strong the evidence is.

• ZincEstablished role

  Zinc is needed for normal immune function. Supplements help if zinc is low; we did not read evidence of extra benefit when intake is adequate.

• Mustard seedDocumented risk

  Mustard is a strong food allergen; reactions can be severe even from small amounts.

• Immune Support FormulasPreliminary or mixed

  Ingredients are studied for cold and respiratory infection outcomes with mixed results.

• Vitamin AEstablished role

  Vitamin A supports the immune system; strongest evidence is in children at risk of deficiency.

• Vitamin EEstablished role

  Vitamin E helps the immune system defend against viruses and bacteria. No source we read shows extra supplements boost immunity when intake is adequate.

• SeleniumEstablished role

  Selenium helps the immune system work properly; extra supplements are not shown to add benefit when intake is adequate.

• CopperEstablished role

  Copper takes part in making white blood cells. This is a normal role, not proof that extra copper strengthens immunity.

• ElderberryPreliminary or mixed

  Small trials suggest elderberry may ease cold and flu symptoms, but the evidence is preliminary and uncertain.

• FenugreekDocumented risk

  Fenugreek can cause allergic reactions, sometimes serious, especially in people allergic to peanut, soya or other legumes.

• EchinaceaPreliminary or mixed

  Mainly used for colds; evidence of a small preventive effect is mixed.

• MugwortDocumented risk

  Mugwort is a common cause of allergy and can cross-react with celery and some spices.

• Reishi (lingzhi)Preliminary or mixed

  Reishi beta-glucans act on immune cells in the lab and some immune-cell percentages rose slightly in cancer patients, but this has not been shown to mean fewer infections or better outcomes.

• Turkey tailPreliminary or mixed

  Immune effects are mostly laboratory findings; human data are small marker studies and PSK cancer-care trials.

• ShiitakePreliminary or mixed

  Small trials of dried shiitake in healthy adults changed immune lab markers and the purified injected lentinan is an approved cancer add-on in Japan and China, but no source shows that eating shiitake or taking supplements prevents illness.

• MaitakePreliminary or mixed

  Same evidence as the immune system link: marker changes, mixed direction, no proof of fewer illnesses.

• Cauliflower mushroomPreliminary or mixed

  Immune cell activity changed in animals, cells and one uncontrolled human report; clinical benefit is unproven.

• Phellinus and SanghuangPreliminary or mixed

  One 8-week trial in healthy adults linked a Phellinus linteus extract to higher natural killer cell activity at one of three test ratios; other immune markers did not change significantly. It is a lab marker, not proof of fewer infections.

• Houttuynia (yu xing cao)Documented risk

  The injection form has caused serious allergic reactions and deaths. Teas and food have no comparable reports in the sources read, but the data are thin.

• False tinder conk (willow bracket)Preliminary or mixed

  Same single trial; lab markers only.

• Sichuan (Szechuan) pepperDocumented risk

  Seed proteins can trigger allergy in some people, with cross-reactivity to cashew, pistachio and citrus seeds, shown in lab tests on patient sera.

• Tiger milk mushroomPreliminary or mixed

  Lab and animal work shows immune-cell activation; one hay fever trial reported lower symptoms but allergy markers did not change. No trial shows fewer infections.

• Annatto (achiote)Documented risk

  Annatto can rarely trigger allergic reactions, including hives and anaphylaxis, in case reports.

• Mistletoe (European)Preliminary or mixed

  Lab studies suggest immune effects; human evidence in cancer care is weak and mixed.

• Nut & Seed Butters (overview)Documented risk

  The allergen risk applies to the immune system; the butters do not support immunity.

• Chamomile TeaDocumented risk

  Allergic reactions, including severe ones, are documented, especially in people allergic to ragweed and daisy-family plants.

• Wheat Bran & Wheat GermDocumented risk

  Wheat is a major food allergen and gluten drives celiac disease.

• Bee Venom (Apitherapy)Documented risk

  Venom is an allergen: it can trigger anaphylaxis, and venom immunotherapy is an allergy treatment.

• Vitamin CPreliminary or mixed

  Regular vitamin C did not prevent colds in the general public but slightly shortened them (8% adults, 14% children).

• American ginsengPreliminary or mixed

  Evidence for fewer or shorter colds is limited and mixed; the review called it insufficient to conclude it reduces incidence or severity.

• AndrographisPreliminary or mixed

  Used for symptoms of infections; no source we read shows it changes immune function in healthy people.

• Asian ginsengPreliminary or mixed

  Preliminary evidence of lower flu risk; may worsen autoimmune disorders.

• ForsythiaPreliminary or mixed

  Used in cold and respiratory-infection formulas. Evidence is for formulas, not forsythia alone, and is limited.

• Honeysuckle (Lonicera)Preliminary or mixed

  Traditional use for infections and limited trial evidence as an add-on in COVID-19; no good evidence for general immune support.

• CordycepsPreliminary or mixed

  Immune lab markers rose in small trials of C. militaris products in healthy adults; clinical benefit not shown.

• Oyster mushroomPreliminary or mixed

  Pleuran trials in children reported fewer infections and immune-marker changes with a purified extract; not shown for the mushroom itself.

• Almond mushroom (Agaricus subrufescens)Preliminary or mixed

  Small trials and lab work suggest immune effects, but results are mixed (a lung-cancer surgery pilot did not significantly improve natural-killer-cell recovery) and most evidence is preclinical.

• TremellaLab or animal research only

  Reported mostly in cell and animal studies.

• Platycodon (balloon flower)Preliminary or mixed

  One 8-week trial found higher NK cell activity with a red platycodon extract than placebo. It measured a blood marker, not infections, so benefit for immunity is not shown.

• Dendrobium (shi hu)Preliminary or mixed

  A small trial in healthy volunteers found immune changes but lower neutralizing antibodies after COVID-19 vaccination. This is not shown to be a benefit.

• Zhu ling (polyporus)Lab or animal research only

  The polysaccharide activates immune cells in the lab and in mice; no human outcome shown.

• Cicada cordycepsLab or animal research only

  Animal findings from a spore polysaccharide.

• Birch leafDocumented risk

  Allergy to the herb or birch pollen is a contraindication, and allergic reactions have been reported.

• Bamboo mushroomLab or animal research only

  Glucans activate immune cells in cell dishes and some mouse models. No human trial was found, so no benefit in people is shown.

• CuminDocumented risk

  Allergic reactions to cumin and related spices are reported. This is a risk, not a benefit.

• Orange cordyceps (Cordyceps militaris)Preliminary or mixed

  Small trials show changes in immune lab markers.

• Cs-4 and cultured Cordyceps myceliumPreliminary or mixed

  A Korean P. hepiali extract raised natural killer cell activity in 79 healthy adults; no infection or illness outcome was tested.

• Perilla (shiso)Preliminary or mixed

  One small trial in seasonal allergy; traditional use for allergies is not proof.

• Citrus Fruits (overview)Deficiency link

  Vitamin C from citrus prevents scurvy, the severe deficiency state; there is no good evidence here that citrus boosts immunity when intake is adequate.

• Wild indigoPreliminary or mixed

  Wild indigo is used in European combination products sold for colds; one small trial of a mixture was positive, trials of the same type were mixed, and wild indigo alone is untested.

• Echinacea TeaPreliminary or mixed

  One older compound-tea trial reported shorter cold symptoms; Cochrane found benefit for treating colds not shown for echinacea products; mixed evidence.

• Goji BerryPreliminary or mixed

  One trial in older adults found changes in some immune markers with juice; not shown to prevent illness.

• Korean Red GinsengLab or animal research only

  Immune-related findings are mostly laboratory-level.

• MozukuPreliminary or mixed

  Same pilot trial of an extract; effect on illness not shown.

• EuglenaPreliminary or mixed

  Immune blood markers rose in trials of Euglena powder; illness prevention is not proven.

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