Beneficial Effects of Herbal and Natural Remedies on the Treatment of COVID -19


avatar Ali Asghar Hemmati 1 , avatar Hoda Mojiri-Forushani 2 , *

Department of Pharmacology, Medicinal Plant Research Center, School of Pharmacy, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran
Department Pharmacology, Abadan University of Medical Sciences, Abadan, Iran

how to cite: Hemmati A A, Mojiri-Forushani H. Beneficial Effects of Herbal and Natural Remedies on the Treatment of COVID -19. Jundishapur J Nat Pharm Prod. 2022;17(2):e121331. doi: 10.5812/jjnpp.121331.

Coronavirus disease 2019 (COVID-19) is a recently recognized strain of coronavirus leading to illness within the range of impacts similar to the common cold to fatal diseases, as a respiratory disease worldwide. The disease was recognized in early December 2019 for the first time. The World Health Organization (WHO) assessed it as a pandemic by the middle of March 2020 (1). Very limited permitted drugs are available with developed efficacy to treat COVID-19 and its complications. Different treatment modalities have been considered a result of the outbreak, such as traditional medicine and extensively utilized during the past epidemic outbreaks, like H1N1 influenza and severe acute respiratory syndrome (SARS) (2).

Certain medications are used for COVID-19, including dexamethasone and remdesivir as antiviral drugs, chloroquine/hydroxychloroquine as an antimalarials drug, and tocilizumab as an IL-6 receptor blocking monoclonal antibody, in different combinations as off-label medications for treating COVID-19. Although some of these drugs could reveal perfect effects to treat this disease, they are expensive.

Nevertheless, there is no specific treatment for COVID-19. Furthermore, health authorities and research institutes are trying to discover the best way for curing or preventing the disease. Herbal remedies may be considered a lower-cost source for managing COVID-19 (3). The involvement of the patient's immune systems with COVID-19 infection and a surging release of inflammatory cytokines have been observed during COVID-19 infection. Herbal medicines with immunomodulatory and anti-inflammatory effects could potentially be preventive and even therapeutic agents for COVID-19 patients (4, 5). There are few studies on herbal and natural medicines comprising certain active compounds with antiviral, antimicrobial, immunostimulatory, and anti-inflammatory activities. Some herbal drugs and their active components in treating COVID-19 are shown in Table 1. In this regard, luteolin and quercetin as natural flavonoids are widespread in some herbal medicine and also have the potential to treat COVID-19 (5-8).

Table 1. Potential Herbal Medicines Against COVID-19
Plant SpeciesBeneficial OrganActive components
Curcuma longaRhizomeCurcumin
Scutellaria baicalensisRootBaicalin, wagonin, steroids, and terpenoids (b-caryophyllene, scutebaicalin, b-sitosterol)
Althaea officinalisRoot and leavesGalacturonorhamnans (rhamnogalacturonan), arabinans, glucans, arabinoglucans, flavonoids (isoscutellarein, luteolin, kaempferol, and hypolaetin), phenolic acids, coumarin (scopoletin), and tannins
Vitis viniferaSeed extractProanthocyanidins and flavonoids
Commiphora molmolGumSesquiterpenes
Sambucus nigraFruitFlavonoids (kaempferol, quercetin, astragalin, isoquercitrin, rutin, hyperoside) and triterpenes
Hedera helixLeavesFlavonoids, falcarinol, dehydrofalcarinol, and saponins
Glycyrrhiza glabraRootSaponins (glycyrrhizin), flavonoids (liquiritin, liquiritigenin, rhamnoliquirilin), triterpenes (glycyrrhetinic acid), and coumarins (licoaryl coumarin)
Andrographis paniculataLeavesAndrographolide, neoandrographolide, and flavonoids (flavanones, methoxylated flavones, chalcones).
Allium sativumBulbAllicin, mercaptan, methyl allyl thiosulfinate, diallyl trisulfide, allyl methyl trisulfide, diallyl disulfide, and S-allyl cysteine sulphoxide
Eucalyptus globulusEssential oil and leaves1,8-cineole, quercetin derivatives, phenolic acids (caffeic acid and ferulic acid), and tannins (gallic and protocatechuic acids)
Echinacea purpureaHerbCichoric acid, caffeic acid, alkyl amides, and polysaccharides
Justicia pectoralisLeavesCoumarins (coumarin and umbelliferone), flavonoids ( quercetin, swertisin, and kaempferol), and lignans (justicidin B)
Magnolia officinalisBarkMagnolol and honokiol, and isoquinoline-type alkaloids
Pimpinella anisumFruit and essential oilEssential oil (trans-anethole), flavonoids (vitexin and orientin), chlorogenic acid derivatives, coumarin derivatives, steroidal compounds, and triterpenes
Mikania glomerataLeavesEssential oil (germacrene D and b-caryophyllene)
Salix sp.BarkSalicin, (+)-catechin, syringin, and triandrin
Pelargonium sidoidesRootGallic acid, (+)-catechin, and methyl gallate
Zingiber officinaleRhizomeZingerone, gingerols, shogaols, paradols, wikstromol, and carinol

Some suggested mechanisms of medicinal plants are presented below that are effective in reducing COVID-19 infection symptoms: (1) immunomodulatory and anti-inflammatory features of the herbs containing quercetin, curcumin, and luteolin are caused by the inhibition of 3CL pro and interactions with viral hemagglutinin (HA) protein for inhibiting virus entry into the cell; (2) inhibition of the activation of RIG-I-like receptors (RLRs) signaling pathway induced by the virus: (Andrographis paniculata); (3) preventing replication, penetration, and adsorption of the virus (glycyrrhizin); (4) inhibition of the key mediators in the inflammation process, like TNF-a, IL-1b, IL-6, and IL-8 (Zingiber officinale and Justicia pectoralis); (5) increasing the lymphocytes proliferation and producing IL-2: (Andrographis paniculata); (6) inhibiting the tumor cell proliferation by the immune system: (Andrographis paniculata) (5, 7, 9).

Considering the meta-analysis studies and systematic reviews, adding herbal remedies to standard care improves the COVID-19 patients’ signs and symptoms, reduces the inflammatory markers and C-reactive protein (CRP) levels, and improves lung function while preventing future damage to the lung, like fibrosis. Some studies even suggested that herbal drugs as supplement therapy may decrease the hospitalization period and the fatality rate compared to the chemical drugs.

According to the meta-analysis studies, significant impacts of the integrated treatment of herbal medicine with chemical drugs after intervening for the total effective rate included the traditional Chinese medicine (TCM) syndrome score (fever, cough, fatigue, and dry and sore throat), disappearance rate (cough and sputum production), complete blood count, including white blood cell and lymphocyte counts, lymphocyte percentage, and levels of procalcitonin and CRP) (9-13).

In conclusion, herbal drugs have been considered an available source to treat diseases, like COVID-19. However, clinical investigations are needed for evaluating the safety and efficacy of traditional and herbal medicine for providing clinical evidence. Then, regulatory authorities' approval is needed. Such intervention may assist in decreasing the disease length and present an affordable treatment regimen for patients. Combining herbal and traditional medicine into conventional therapy may be another method for treating COVID-19 in the future.


  • 1.

    World Health Organization. WHO Director-General's opening remarks at the media briefing on COVID-19-11. Geneva, Switzerland: World Health Organization; 2020.

  • 2.

    Luo H, Tang QL, Shang YX, Liang SB, Yang M, Robinson N, et al. Can Chinese Medicine Be Used for Prevention of Corona Virus Disease 2019 (COVID-19)? A Review of Historical Classics, Research Evidence and Current Prevention Programs. Chin J Integr Med. 2020;26(4):243-50. doi: 10.1007/s11655-020-3192-6. [PubMed: 32065348]. [PubMed Central: PMC7088641].

  • 3.

    Asif M, Saleem M, Saadullah M, Yaseen HS, Al Zarzour R. COVID-19 and therapy with essential oils having antiviral, anti-inflammatory, and immunomodulatory properties. Inflammopharmacology. 2020;28(5):1153-61. doi: 10.1007/s10787-020-00744-0. [PubMed: 32803479]. [PubMed Central: PMC7427755].

  • 4.

    Zhang L, Liu Y. Potential interventions for novel coronavirus in China: A systematic review. J Med Virol. 2020;92(5):479-90. doi: 10.1002/jmv.25707. [PubMed: 32052466]. [PubMed Central: PMC7166986].

  • 5.

    Sharma M, Anderson SA, Schoop R, Hudson JB. Induction of multiple pro-inflammatory cytokines by respiratory viruses and reversal by standardized Echinacea, a potent antiviral herbal extract. Antiviral Res. 2009;83(2):165-70. doi: 10.1016/j.antiviral.2009.04.009. [PubMed: 19409931].

  • 6.

    Kocaadam B, Sanlier N. Curcumin, an active component of turmeric (Curcuma longa), and its effects on health. Crit Rev Food Sci Nutr. 2017;57(13):2889-95. doi: 10.1080/10408398.2015.1077195. [PubMed: 26528921].

  • 7.

    Silveira D, Prieto-Garcia JM, Boylan F, Estrada O, Fonseca-Bazzo YM, Jamal CM, et al. COVID-19: Is There Evidence for the Use of Herbal Medicines as Adjuvant Symptomatic Therapy? Front Pharmacol. 2020;11:581840. doi: 10.3389/fphar.2020.581840. [PubMed: 33071794]. [PubMed Central: PMC7542597].

  • 8.

    Chen WC, Tseng CK, Chen BH, Lin CK, Lee JC. Grape Seed Extract Attenuates Hepatitis C Virus Replication and Virus-Induced Inflammation. Front Pharmacol. 2016;7:490. doi: 10.3389/fphar.2016.00490. [PubMed: 28066241]. [PubMed Central: PMC5174132].

  • 9.

    Huang F, Li Y, Leung EL, Liu X, Liu K, Wang Q, et al. A review of therapeutic agents and Chinese herbal medicines against SARS-COV-2 (COVID-19). Pharmacol Res. 2020;158:104929. doi: 10.1016/j.phrs.2020.104929. [PubMed: 32442720]. [PubMed Central: PMC7237953].

  • 10.

    Ang L, Song E, Lee HW, Lee MS. Herbal Medicine for the Treatment of Coronavirus Disease 2019 (COVID-19): A Systematic Review and Meta-Analysis of Randomized Controlled Trials. J Clin Med. 2020;9(5). doi: 10.3390/jcm9051583. [PubMed: 32456123]. [PubMed Central: PMC7290825].

  • 11.

    Nugraha RV, Ridwansyah H, Ghozali M, Khairani AF, Atik N. Traditional Herbal Medicine Candidates as Complementary Treatments for COVID-19: A Review of Their Mechanisms, Pros and Cons. Evid Based Complement Alternat Med. 2020;2020:2560645. doi: 10.1155/2020/2560645. [PubMed: 33101440]. [PubMed Central: PMC7569437].

  • 12.

    Panyod S, Ho CT, Sheen LY. Dietary therapy and herbal medicine for COVID-19 prevention: A review and perspective. J Tradit Complement Med. 2020;10(4):420-7. doi: 10.1016/j.jtcme.2020.05.004. [PubMed: 32691006]. [PubMed Central: PMC7260602].

  • 13.

    Fan AY, Gu S, Alemi SF; Research Group for Evidence-based Chinese Medicine. Chinese herbal medicine for COVID-19: Current evidence with systematic review and meta-analysis. J Integr Med. 2020;18(5):385-94. doi: 10.1016/j.joim.2020.07.008. [PubMed: 32792254]. [PubMed Central: PMC7834293].

Copyright © 2021, Author(s). This is an open-access article distributed under the terms of the Creative Commons Attribution-NonCommercial 4.0 International License ( which permits copy and redistribute the material just in noncommercial usages, provided the original work is properly cited.