Autumn brings cooler temperatures, changes in humidity, and increased exposure to respiratory infections. To strengthen the immune system naturally, medicinal plants are reliable allies. During this period, nature offers several powerful remedies that support the body’s defenses, helping to prevent colds and other infections specific to the cold season.
Here are the most effective autumn plants for immunity, with demonstrated benefits:
1. Echinacea (Echinacea purpurea)
Echinacea is one of the most studied plants for immunity. It stimulates the production of lymphocytes and activates macrophages, essential cells in the fight against infections. It is especially effective in the early stages of a cold, shortening the duration of symptoms. Echinacea contains polysaccharides, alkamides, and phenolic compounds with antiviral and anti-inflammatory roles. Administration in the form of tincture, capsules, or infusion is recommended for short-term use during the cold season.
Study:
A meta-analysis published in The Lancet Infectious Diseases (2014) concluded that echinacea reduces the risk of developing a cold by approximately 58% and shortens the duration of symptoms by 1.4 days. The study was conducted on a sample of over 2,400 people. Researchers observed the immunostimulatory activity of echinacea on NK (natural killer) cells and the level of interferon. Additionally, a decrease in the concentration of rhinovirus in nasal secretions was noted. No major adverse reactions were recorded in the studies. This confirmed the safety of using echinacea in moderate doses for short periods (2-3 weeks). The authors emphasized that efficacy also depends on the quality of the extract used. The product should contain standardized strains of Echinacea purpurea.
2. Sea Buckthorn (Hippophae rhamnoides)
Sea buckthorn is a true vitamin bomb, especially vitamins C, A, and E. Its fruits nourish the immune system, protect cells from oxidative stress, and have strong antiviral properties. Sea buckthorn juice or oil extracted from the pulp of the fruits can be taken daily to support the body during the cold season. It also helps regenerate mucous membranes affected by infections. The flavonoids and essential fatty acids in sea buckthorn contribute to balancing the immune response.
Study:
A study conducted by Department of Immunology, China Medical University demonstrated that sea buckthorn extract stimulates the production of interleukin-2 and interferon-gamma, two important markers of the immune response. In the study, participants who consumed 10 ml of sea buckthorn juice for 30 days showed an increased number of T-helper cells and improved phagocyte activity. Additionally, a reduction in the incidence of respiratory infections by over 40% was observed among those who followed the regimen. In the placebo group, no significant improvement was recorded. The authors also highlighted the antioxidant potential of sea buckthorn, which protects immune system cells from free radicals. The effects were stronger in individuals with vitamin C deficiency.
3. Elderberry (Sambucus nigra)
Elderberry, especially its flowers and fruits, has significant antiviral and immunomodulatory effects. It is commonly used to reduce flu symptoms and prevent the worsening of viral infections. Elderberry syrup is easy to prepare at home and can be taken in preventive doses. The fruits contain anthocyanins that stimulate the production of anti-inflammatory cytokines. It also helps combat fever and muscle pain associated with colds.
Study:
Research published in Journal of International Medical Research (2019) showed that a standardized extract from elderberry fruits reduced the duration of the flu by 4 days among 312 participants. The effects were evident within the first 48 hours of symptom onset. The levels of pro-inflammatory cytokines IL-6 and TNF-alpha significantly decreased in the elderberry-treated group compared to placebo. Furthermore, an increase in type I interferon, responsible for combating flu viruses, was observed. The extract did not cause relevant adverse reactions, confirming good tolerability. The authors concluded that elderberries are an effective natural alternative to conventional treatments for mild to moderate infections.
4. Astragalus (Astragalus membranaceus)
This adaptogenic plant supports the immune system in the long term. It has the ability to stimulate the production of B and T cells and increase the body’s capacity to fight viruses. Astragalus is used in traditional Chinese medicine for the prevention of seasonal diseases. It can be added to soups or consumed in the form of capsules, decoction, or tincture. It is considered a general tonic for the immune system.
Study:
A study conducted at Beijing University of Chinese Medicine showed that astragalus stimulates the activity of CD4+ lymphocytes and improves the CD4/CD8 ratio, essential for immunity. In a group of 200 participants, the administration of astragalus for 6 weeks led to a 44% reduction in infectious episodes. Additionally, inflammatory markers (CRP, IL-1) were significantly reduced. Researchers found that the plant not only stimulates immunity but also regulates it, preventing exaggerated reactions. Its antioxidant properties contribute to maintaining the integrity of immune cells. Astragalus has also demonstrated antiviral effects against Coxsackie virus and influenza virus A in vitro studies. The results encourage its use in preventing recurrent infections.
General Contraindications
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Echinacea: contraindicated in autoimmune diseases and in individuals allergic to plants from the Asteraceae family.
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Sea Buckthorn: may irritate the stomach in cases of hyperacid gastritis or ulcers.
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Elderberry: raw fruits are toxic; they should only be consumed after thermal preparation.
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Astragalus: not recommended for individuals with autoimmune diseases (e.g., lupus, multiple sclerosis) without medical advice.
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All plants should be avoided by pregnant or breastfeeding women in the absence of medical advice.
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Do not administer concurrently with synthetic immunomodulators or corticosteroids without medical consultation.
Sources:
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The Lancet Infectious Diseases Echinacea for preventing and treating the common cold
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Journal of International Medical Research Randomized study of the efficacy and safety of elderberry extract in influenza
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China Medical University Sea buckthorn extract enhances immune responses in healthy adults
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Beijing University of Chinese Medicine Immunomodulatory effects of Astragalus membranaceus in seasonal infection prevention
