Immune Support

Uses

  • Immunity, Boosting
  • Infections, Frequent
  • Weak Immunity
The immune system is how the body protects itself from illness. It attacks the things that cause disease.
Healthy habits can help support the immune system. Natural therapies have also been used to support or strengthen the immune system.

Natural Therapies

Likely Effective

  • Andrographis is a plant that can be taken as a supplement. It is likely to quicken recovery and improve symptoms of colds and throat/chest problems. (Note: It should not be taken by people who have problems with their immune system.) A6, A14, A20
  • Echinacea is likely to reduce frequency and ease symptoms of some illnesses but is unlikely to reduce the frequency of common cold. (Note: It should not be taken by people who have problems with their immune system, sleep, or anxiety.) A5, A8, A12, A15
  • Flavonoids are compounds in food and drinks like wine and tea. They are likely to lower the rate of upper respiratory tract infections. A29
  • L-arginine is an amino acid found in the body. It is likely to lower the rate of problems from infections. A32
  • Pelargonium sidoides (African geranium) is a plant that can be taken as a pill, extract, lozenge, or syrup. It is likely to ease symptoms of cough and may reduce cold-like symptoms. A7, A9, A11, A23
  • Traditional Chinese medicine is likely to have benefit in treating influenza. A30
  • Zinc is an essential nutrient that can be taken as a pill, liquid, syrup, or lozenge. It is likely to shorten the time of illness and improve the outcome of colds and pneumonia. (Note: It may cause nausea when used as a lozenge.) A10, A18, A19, A35

May Be Effective

  • Elderberry may help shorten the time of illness and ease cold-like symptoms. A16, A24
  • Maoto is a extract of four plants that was developed in ancient China. It may lower the duration of fever. A24
  • Panax ginseng is an herb that may improve the immune response. A38

May Not Be Effective

These therapies may not have benefit in treating the common cold:
  • Chinese proprietary herbal medicine A31
  • Vitamin C is found in citrus fruits, sweet peppers, and broccoli. A25-A27, A37

Unlikely to Be Effective

Vitamin D is found in fish, milk, and sunlight. It is unlikely to have benefit. A28

Not Enough Data to Assess

Editorial process and description of evidence categories can be found at EBSCO NAT Editorial Process.
Editorial process and description of evidence categories can be found at EBSCO NAT Editorial Process.

Herbs and Supplements to Be Used With Caution

Talk to your doctor about any supplements or therapy you would like to use. Some can interfere with treatment or make conditions worse, such as:
  • Andrographis may make the immune system more active. Talk to your doctor before taking it if you have problems with your immune system. It may also not be safe to take with medication for sleep and anxiety.
  • Echinacea should not be taken by people who have problems with their immune system, sleep, or anxiety.
  • Zinc may cause nausea when used as a lozenge.

References

A Herbs and Supplements
A1 Federspil P, Wulkow R, et al. [Effects of standardized Myrtol in therapy of acute sinusitis—results of a double-blind, randomized, multicenter study compared with placebo]. Laryngorhinootologie. 1997;76(1):23-27.
A2 Meister R, Wittig T, et al. Efficacy and tolerability of myrtol standardized in long-term treatment of chronic bronchitis. A double-blind, placebo-controlled study. Study Group Investigators. Arzneimittelforschung.1999;49(4):351-358.
A3 Matthys H, de Mey C, et al. Efficacy and tolerability of myrtol standardized in acute bronchitis. A multi-centre, randomised, double-blind, placebo-controlled parallel group trial vs. cefuroxime and ambroxol. Arzneimittelforschung. 2000;50(8):700-711.
A4 Van Brummelen R, du Toit D. L-methionine as immune supportive supplement: a clinical evaluation. 2007;33(1):157-163.
A5 Schapowal A, Berger D, et al. Echinacea/sage of chlorhexidine/lidocaine for treating acute sore throats: a randomized double-blind trial. Eur J Med Res. 2009;14(9):406-412.
A6 Saxena RC, Singh R, et al. A randomized double blind placebo controlled clinical evaluation of extract of Andrographis paniculata (KalmCold) in patients with uncomplicated upper respiratory tract infection. Phytomedicine. 2010;17(3-4):178-185.
A7 Kamin W, Maydannik VG, et al. Efficacy and tolerability of Eps 7630 in patients (aged 6-18 years old) with acute bronchitis. Acta Paediatr. 2010;99(4):537-543.
A8 Nahas R, Balla A. Complementary and alternative medicine for prevention and treatment of the common cold. Can Fam Physician. 2011;57(1):31-36.
A9 Ross SM. African geranium (Eps 7630), part I: a proprietary root extract of Pelargonium sidoides (Eps 7630) is found to be effective in resolving symptoms associated with the common cold in adults. Holist Nurs Pract. 2012;26(2):106-109.
A10 Science M, Johnstone J, et al. Zinc for the treatment of the common cold: a systematic review and meta-analysis of randomized controlled trials. CMAJ. 2012;184(10):E551-561.
A11 Matthys H, Pliskevich DA, et al. Randomised, double-blind, placebo-controlled trial of Eps 7630 in adults with COPD. Respir Med. 2013; 107(5): 691-701.
A12 Karsch-Völk M, Barrett B, et al. Echinacea for preventing and treating the common cold. Cochrane Database Syst Rev. 2014;(2):CD000530.
A13 Lissiman E, Bhasale AL, et al. Garlic for the common cold. Cochrane Database Syst Rev. 2014;(11):CD006206.
A14 Wagner L, Cramer H, et al. Herbal Medicine for Cough: a Systematic Review and Meta-Analysis. Forsch Komplementmed. 2015;22(6):359-368.
A15 Schapowal A, Klein P, et al. Echinacea reduces the risk of recurrent respiratory tract infections and complications: a meta-analysis of randomized controlled trials. Adv Ther. 2015;32(3):187-200.
A16 Tiralongo E, Wee SS, et al. Elderberry Supplementation Reduces Cold Duration and Symptoms in Air-Travelers: A Randomized, Double-Blind Placebo-Controlled Clinical Trial. Nutrients. 2016;8(4):182.
A17 Nitsche MP, Carreño M. Is honey an effective treatment for acute cough in children? Medwave. 2016;16(2):e6454.
A18 Singh M, Das RR. Zinc for the common cold. Cochrane Database Syst Rev. 2013 Jun 18;(6):CD001364.
A19 Hemilä H, Petrus EJ, et al. Zinc acetate for treating the common cold: an individual patient data meta-analysis. Br J Clin Pharmacol. 2016;82(5):1393-1398.
A20 Hu XY, Wu RH, et al. Andrographis paniculate (Chuān Xīn Lián) for symptomatic relief of acute respiratory infections in adults and children: A systematic review and meta-analysis. PLoS One. 2017;12(8).
A21 Tshingani K, Donnen P, et al. Impact of Moringa oleifera Iam. Leaf powder supplementation versus nutritional counseling on the body mass index and immune response of HIV patients on antiretroviral therapy: a single-blind randomized control trial. BMC Complement Altern Med. 2017;17(1):420.
A22 Oduwole O, Udoh EE, et al. Honey for acute cough in children. Cochrane Database Syst Rev. 2018;4:CD007094.
A23 Riley DS, Lizogub VG, et al. Efficacy and Tolerability of High-dose Pelargonium Extract in Patients With the Common Cold. Altern Ther Health Med. 2018;24(2):16-26. A24. Hawkins J, Baker C, et al. Black elderberry (Sambucus nigra) supplementation effectively treats upper respiratory symptoms: A meta-analysis of randomized, controlled clinical trials. Complement Ther Med. 2019;42:361-365.
A24 Yoshino T, Arita R, et al. The use of maoto (Ma-Huang-Tang), a traditional Japanese Kampo medicine, to alleviate flu symptoms: a systematic review and meta-analysis. BMC Complement Altern Med. 2019 Mar 18;19(1):68.
A25 Quidel S, Gómez E, et al. What are the effects of vitamin C on the duration and severity of the common cold? Medwave. 2018 Oct 3;18(6):e7261.
A26 Gómez E, Quidel S, et al. Does vitamin C prevent the common cold? Medwave. 2018 Aug 6;18(4):e7235.
A27 Ran L, Zhao W, et al. Extra Dose of Vitamin C Based on a Daily Supplementation Shortens the Common Cold: A Meta-Analysis of 9 Randomized Controlled Trials. Biomed Res Int. 2018 Jul 5;2018:1837634.
A28 Yakoob MY, Salam RA, et al. Vitamin D supplementation for preventing infections in children under five years of age. Cochrane Database Syst Rev. 2016 Nov 9;11:CD008824.
A29 Somerville VS, Braakhuis AJ, et al. Effect of Flavonoids on Upper Respiratory Tract Infections and Immune Function: A Systematic Review and Meta-Analysis. Adv Nutr. 2016 May 16;7(3):488-497.
A30 Wang C, Wang H, et al. Traditional Chinese medicine for the treatment of influenza: a systematic review and meta-analysis of randomized controlled trials. J Tradit Chin Med. 2014 Oct;34(5):527-531.
A31 Chen W, Lewith G, et al. Chinese proprietary herbal medicine listed in 'China national essential drug list' for common cold: a systematic literature review. PLoS One. 2014 Oct 20;9(10):e110560.
A32 Kang K, Shu XL, et al. Effect of L-arginine on immune function: a meta-analysis. Asia Pac J Clin Nutr. 2014;23(3):351-359.
A34 Chen W, Liu B, et al. Chinese patent medicines for the treatment of the common cold: a systematic review of randomized clinical trials. BMC Complement Altern Med. 2014 Jul 30;14:273.
A35 Singh M, Das RR. Zinc for the common cold. Cochrane Database Syst Rev. 2013 Jun 18;(6):CD001364. doi: 10.1002/14651858.CD001364.pub4. Review. Update in: Cochrane Database Syst Rev. 2015;(4):CD001364.
A36 Jiang L, Deng L, et al. Chinese medicinal herbs for influenza. Cochrane Database Syst Rev. 2013 Mar 28;(3):CD004559.
A37 Hemilä H, Chalker E. Vitamin C for preventing and treating the common cold. Cochrane Database Syst Rev. 2013 Jan 31;(1):CD000980.
A38 Shergis JL, Zhang AL, et al. Panax ginseng in randomised controlled trials: a systematic review. Phytother Res. 2013 Jul;27(7):949-965.
A39 Chen W, Lim CE, et al. Chinese herbal medicines for the treatment of type A H1N1 influenza: a systematic review of randomized controlled trials. PLoS One. 2011;6(12):e28093.

Revision Information

  • Reviewer: EBSCO NAT Review Board Eric Hurwitz, DC
  • Review Date: 10/2019
  • Update Date: 06/01/2020