Garlic

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Garlic

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Garlic

Common Names

  • Nectar of the gods
  • Camphor of the poor
  • Da-suan
  • La-suan
  • Stinking rose

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For Patients & Caregivers

Tell your healthcare providers about any dietary supplements you’re taking, such as herbs, vitamins, minerals, and natural or home remedies. This will help them manage your care and keep you safe.

How It Works

Evidence on whether garlic can help lower cholesterol levels or blood pressure are mixed. It is associated with a decreased risk for some cancers, but there is no evidence that it can treat cancer.

Derived from the bulb or clove of the plant, garlic is used as a spice worldwide. It is also used traditionally for a variety of conditions such as maintaining circulatory function, to treat infections, and to boost the immune system. Raw garlic contains compounds called alliin and allicin. In lab studies, these compounds and their breakdown products killed bacteria, reduced platelets and lipids in the blood, and slowed clotting.

Studies on whether garlic can reduce cholesterol or lower blood pressure are mixed, but other data suggest it may help reduce some cardiovascular risk factors, stimulate the immune system, or protect against some cancers.

Processing may reduce the active compounds found in garlic products. For example, garlic powder and garlic essential oil do not contain allicin or ajoene, the compounds believed to have cholesterol-reducing and blood-thinning properties.

Patients taking warfarin or other blood thinners should ask their doctor before taking garlic supplements.

Purported Uses
  • To treat cardiovascular disease
    Clinical trials studying the effect of garlic on blood pressure and cholesterol levels have shown mixed results, but other analyses suggest it may help reduce some risk factors for cardiovascular disease. Patients should ask their doctor before taking garlic supplements.
  • To prevent and treat cancer
    Evidence on whether garlic can reduce the risk of gastric and colorectal cancers is mixed. Garlic has been associated with a decreased risk for some other types of cancer as well, but there is no evidence that it can treat cancer.
  • To treat infections
    Lab experiments and small studies in humans suggest that garlic stimulates the immune system and has antimicrobial activity, but it is unclear whether it can treat infections.
Patient Warnings
  • Garlic supplements should be discontinued 1–2 weeks before surgery because of the potential for increased bleeding.
  • Topical use of garlic preparations should be avoided due to cases of chemical burns that occurred in attempts to treat a variety of conditions.
Do Not Take If
  • You are taking warfarin or other blood thinners: Garlic may increase the risk of bleeding or bruising.
  • You take cyclosporine: Garlic can reduce its effectiveness and potentially cause transplant rejection.
  • You are taking protease inhibitors (darunavir/Prezista®, saquinavir/Fortovase®, Invirase®): In 2 cases of HIV patients who regularly consumed garlic, darunavir became ineffective. Other studies in humans found garlic significantly reduced blood levels of saquinavir and may therefore also reduce its effectiveness.
  • You are taking insulin: Dose adjustments may be required because of the occasional blood sugar-lowering effect of garlic supplements. Take with caution and consult your doctor.
  • You are taking drugs that are substrates of cytochrome P450 2C9, 2C19, or 3A4: Garlic may increase the risk of side effects of these drugs.
  • You are taking drugs that are substrates of P-glycoprotein: Garlic may reduce the activity of such drugs.
Side Effects
  • Headache
  • Fatigue
  • Offensive odor, bad breath
  • Stomach upset
  • Diarrhea
  • Changes in natural intestinal bacteria
  • Sweating
  • Low blood sugar
  • Altered platelet function
  • Increased bleeding risk

Case Reports (Oral)

  • Bleeding, reduced blood clotting: Following excessive use of garlic supplements.
  • Redetected levels of HIV: In 2 cases due to interactions between garlic and darunavir. The effectiveness of the medication returned some time after garlic intake was stopped.
  • Chemical burns in the mouth lining: Following consumption of crushed garlic.
  • Allergic reactions: Two cases, following ingestion of garlic.
  • Liver toxicity: After a liver transplant patient was started on high-dose garlic supplementation to treat low levels of oxygen in the blood.

Case Reports (Topical)

  • Chemical burns: Multiple cases from the topical use of garlic in attempts to treat warts, rash/itching, tooth pain, acne, and sore throat.
  • Skin rash: Due to “garlic necklace” on infant’s neck to treat nasal congestion
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For Healthcare Professionals

Brand Name
Garlique®, Kwai®, Kyolic®, One-a-day Garlic®
Scientific Name
Allium sativum
Clinical Summary

Derived from the bulb or clove of the plant, garlic is used as a spice and to treat hyperlipidemia, hypertension, atherosclerosis, cancer, and infections. Processing can have a substantial effect on the chemical content of garlic because the volatile oil components are heat-sensitive and certain enzymes are acid-labile. The best measure of total activity of garlic is its ability to produce allicin, which in turn, results in the formation of other active constituents (1). Several oral garlic formulations are available, and clinical studies have evaluated a variety of the proposed claims.

Various placebo-controlled trials on cholesterol-lowering effects of garlic yielded mixed results (2) (3) (4) (5) (6) (7) (31). Data on whether garlic preparations may lower blood pressure are also mixed (45) (53) (55), but other meta-analyses suggest reductions in cardiovascular risk factors due to antihyperlipidemic effects, reduced inflammatory biomarkers, and improved glucose levels (50) (56) (57) (58) (59). In other studies, aged garlic extract did not improve metabolic parameters in diabetic patients at high cardiovascular risk (60), but reduced low-attenuation plaque volume (61). Garlic extract also improved endothelial biomarkers associated with cardiovascular risk in obese individuals (62). Data also suggest immunostimulatory effects (53) and benefits in patients with hepatopulmonary syndrome (32), but more data are needed to determine if garlic is effective against the common cold (33) and vaginal candidiasis (47).

A number of studies have evaluated whether garlic products can have protective effects against various cancers. In a large randomized intervention trial, long-term garlic supplementation was associated with reduced risk of gastric cancer mortality but not incidence (63), although conflicting data did not find evidence for either (43). Whether garlic protects against Helicobacter pylori infection is also unclear (64). Meta-analyses are also mixed on whether garlic intake reduces colorectal cancer risk (65) (66). Preliminary studies suggest aged garlic extract may reduce number and size of subsequent colorectal adenomas in patients with a history of adenomas (15), and improve natural killer cell number and activity but not quality of life in patients with advanced cancers (14). Inverse associations have been identified between garlic consumption and risk of endometrial (13), prostate (12), and other cancers (9). Garlic supplementation may also be associated with reduced risk of hematologic malignancies (40).

Because garlic is known to decrease platelet aggregation and potentially elevate International Normalized Ratio (INR) values, it should not be used with anticoagulants or in patients with platelet dysfunction (17).

Purported Uses
  • Cardiovascular disease
  • High cholesterol
  • Hypertension
  • Infections
  • Cancer
Mechanism of Action

The intact cells of garlic contain an odorless, sulfur-containing amino acid derivative known as alliin. When the cells are crushed, alliin comes into contact with the enzyme alliinase located in neighboring cells and is converted to allicin. Allicin has antibacterial and antimicrobial activity, but is highly odoriferous and unstable. It also has antiplatelet and antihyperlipidemic activities. Most authorities agree that the best measure of the total activity of garlic is its ability to produce allicin, which, in turn, results in the formation of other active constituents (1).

In patients with hyperlipidemia, garlic might lower cholesterol levels by acting as an HMG-CoA reductase inhibitor (21). For atherosclerosis, garlic is believed to reduce oxidative stress and low-density lipoprotein oxidation and have antithrombotic effects (22). It is also thought to reduce blood pressure by causing smooth muscle relaxation and vasodilation by activating the production of endothelium-derived relaxation factor (23).

Garlic may stimulate both humoral and cellular immunity, causing T-cell proliferation, restoring suppressed antibody responses (24), and stimulating macrophage cytotoxicity on tumor cells. It may increase selenium absorption with possible protection against tumorigenesis (25). In addition, garlic may protect against certain cancers by halting cell cycle progression and inducing apoptosis of cancer cells as well as by decreasing angiogenesis and influencing carcinogen metabolism (26) (27).

Warnings
  • Discontinue use of garlic at least 7 days prior to surgery (17).
  • Chemical burns with topical applications of garlic have been reported in attempts to treat a variety of conditions (44) (48) (51) (52) (67) (68) (69).
Adverse Reactions

Headache, fatigue, altered platelet function with potential for bleeding, offensive odor, GI upset, diarrhea, sweating, changes in the intestinal flora, hypoglycemia (16).

Case Reports (Oral)

  • Anaphylaxis  (38) (54)
  • Perioperative bleeding: Following excessive garlic intake (46) (70).
  • Prolonged bleeding, spinal epidural hematoma, platelet dysfunction: Following excessive use of garlic (29).
  • Renal hematoma following lithotripsy: In a 51-year-old man, due to excessive odorless garlic ingestion. Treated with antibiotics and fluids; remission occurred after 5 months (35).
  • Viral rebound in HIV patients: Two cases occurred due to significant interactions between garlic and darunavir that resulted in sub-therapeutic DRV plasma concentrations (71).
  • Hepatotoxicity: After a liver transplant patient was started on high-dose garlic supplementation for presenting hypoxemia and hepatopulmonary syndrome (72).
  • Chemical burn of oral mucosa: Following consumption of crushed garlic (36).

Case Reports (Topical)

  • Chemical burns: From topical garlic preparations, used in attempts to treat warts (44) (67), rash/itching (48), tooth pain (51) (68), acne (69), and sore throat (52).
  • Infant contact dermatitis: Due to “garlic necklace” on infant’s neck to treat nasal congestion (73).
Herb-Drug Interactions
  • Warfarin: Anticoagulant activity may be enhanced due to increased fibrinolytic activity and diminished human platelet aggregation (17) (49).
  • Protease inhibitors (darunavir, saquinavir): In 2 cases of HIV-infected patients, clinically significant interactions between garlic and darunavir that resulted in sub-therapeutic DRV plasma concentrations and viral rebound (71). In one case the patient ingested 15 garlic cloves per week, while in the other the patient could not quantify the amount, but said it was significant. In both patients, drug effectiveness eventually returned with the cessation of garlic. In healthy volunteers, garlic supplements with the rough equivalent of two 4-g cloves of garlic daily significantly decreased mean serum concentration levels, peak levels by 54%, and trough levels by 49%. These reductions in levels can cause therapeutic failure (18).
  • Insulin: Dose of insulin may require adjustment due to hypoglycemic effects of garlic exhibited in animal studies (39).
  • Cytochrome (CYP) P450 substrates: In vitro studies suggest that garlic products may inhibit CYP 2C9 and 2C19, and may interfere with the drugs metabolized by these enzymes (41) (42). Studies on its effects on 3A4 are mixed (34) (41) (42).
  • P-Glycoprotein substrates: In healthy volunteers, garlic extract induced P-glycoprotein and can interfere with the metabolism of certain drugs (34).
Herb Lab Interactions
  • Insulin
  • Increased PT and INR
  • Decreased cholesterol
  • Change in blood pressure
Dosage (OneMSK Only)
References
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  2. Ackermann RT, et al. Garlic shows promise for improving some cardiovascular risk factors. Arch Intern Med 2001;161:813-24.
  3. Berthold HK, et al. Effect of a garlic oil preparation on serum lipoproteins and cholesterol metabolism: a randomized controlled trial. JAMA 1998;279:1900-2.
  4. Gardner CD, et al. Effect of Raw Garlic vs Commercial Garlic Supplements on Plasma Lipid Concentrations in Adults With Moderate Hypercholesterolemia: A Randomized Clinical Trial. Arch Intern Med. 2007 Feb 26;167(4):346-53.
  5. Isaacsohn JL, et al. Garlic powder and plasma lipids and lipoproteins: a multicenter, randomized, placebo-controlled trial. Arch Inter Med 1998;158:1189-94.
  6. Kannar D, et al. Hypocholesterolemic effect of an enteric coated garlic supplement. J Am Coll Nutr 2001;20:225-31.
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  10. Guercio V, Galeone C, Turati F, et al. Gastric cancer and allium vegetable intake: a critical review of the experimental and epidemiologic evidence. Nutr Cancer. 2014;66(5):757-73.
  11. Ngo SN, Williams DB, Cobiac L, et al. Does garlic reduce risk of colorectal cancer? A systematic review. J Nutr. Oct 2007;137(10):2264-2269.
  12. Hsing AW, Chokkalingam AP, Gao YT, et al. Allium vegetables and risk of prostate cancer: a population-based study. J Natl Cancer Inst. Nov 6 2002;94(21):1648-1651.
  13. Galeone C, Pelucchi C, Dal Maso L, et al. Allium vegetables intake and endometrial cancer risk. Public Health Nutr. Nov 6 2008:1-4.
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  15. Tanaka S, Haruma K, Yoshihara M, et al. Aged garlic extract has potential suppressive effect on colorectal adenomas in humans. J Nutr. Mar 2006;136(3 Suppl):821S-826S.
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  17. Ang-lee M, et al. Herbal Medicines and perioperative care. JAMA 2001;286:208-16.
  18. Piscitelli SC, et al. The effect of garlic supplements on the pharmacokinetics of saquinavir. Clin Infect.Dis. 2002;34:234-8.
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  22. Dirsch VM, et al. Effect of allicin and ajoene, two compounds of garlic, on inducible nitric oxide synthase. Atherosclerosis 1998;139:333-9.
  23. Pedraza-Chaverri J, et al. Garlic prevents hypertension induced by chronic inhibition of nitric oxide synthesis. Life Sci 1998;62:71-7.
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  25. Hirsch K, et al. Effect of purified allicin, the major ingredient in freshly crushed garlic, on cancer cell proliferation. Nutr Cancer 2000;38:245-54.
  26. Powolny AA, Singh SV. Multitargeted prevention and therapy of cancer by diallyl trisulfide and related Allium vegetable-derived organosulfur compounds. Cancer Lett. Oct 8 2008;269(2):305-314.
  27. Herman-Antosiewicz A, Powolny AA, Singh SV. Molecular targets of cancer chemoprevention by garlic-derived organosulfides.Acta Pharmacol Sin. Sep 2007;28(9):1355-1364.
  28. Song K, Milner JA. The influence of heating on the anticancer properties of garlic. J Nutrition 2001;131:1054S-7S.
  29. Rose KD, et al. Spontaneous spina epidural hematoma with associated platelet dysfunction from excessive garlic ingestion: a case report. Neurosurgery 1990;26:880-2.
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  31. Hasani-Ranjbar S, Nayebi N, Moradi L, Mehri A, Larijani B, Abdollahi M. The efficacy and safety of herbal medicines used in the treatment of hyperlipidemia; a systematic review. Curr Pharm Des. 2010;16(26):2935-47.
  32. De BK, Dutta D, Pal SK, Gangopadhyay S, Das Baksi S, Pani A. The role of garlic in hepatopulmonary syndrome: a randomized controlled trial. Can J Gastroenterol. 2010 Mar;24(3):183-8.
  33. Lissiman E, Bhasale AL, Cohen M. Garlic for the common cold. Cochrane Database Syst Rev. 2012 Mar 14;3:CD006206.
  34. Hajda J, Rentsch KM, Gubler C, Steinert H, Stieger B, Fattinger K. Garlic extract induces intestinal P-glycoprotein, but exhibits no effect on intestinal and hepatic CYP3A4 in humans. Eur J Pharm Sci. 2010; 41(5):729-35.
  35. Gravas S, Tzortzis V, Rountas C, Melekos MD. Extracorporeal shock-wave lithotripsy and garlic consumption: a lesson to learn. Urol Res. 2010 Feb;38(1):61-3.
  36. Bagga S, Thomas BS, Bhat M. Garlic burn as self-inflicted mucosal injury—a case report and review of the literature. Quintessence Int. 2008 Jun;39(6):491-4.
  37. Hasani-Ranjbar S, Nayebi N, Moradi L, et al. The efficacy and safety of herbal medicines used in the treatment of hyperlipidemia; a systematic review. Curr Pharm Des. 2010;16(26):2935-47.
  38. Vovolis V, Kalogiros L, Ivanova D, Koutsostathis N. Garlic-induced severe anaphylaxis in a nonatopic patient. J Investig Allergol Clin Immunol. 2010;20(4):356.
  39. Madkor HR, Mansour SW, Ramadan G. Modulatory effects of garlic, ginger, turmeric and their mixture on hyperglycaemia, dyslipidaemia and oxidative stress in streptozotocin-nicotinamide diabetic rats. Br J Nutr. 2011 Apr;105(8):1210-7.
  40. Walter RB, Brasky TM, Milano F, White E. Vitamin, mineral, and specialty supplements and risk of hematologic malignancies in the prospective VITamins And Lifestyle (VITAL) study.Cancer Epidemiol Biomarkers Prev. 2011 Oct;20(10):2298-308.
  41. Ho BE, Shen DD, McCune JS, et al. Effects of Garlic on Cytochromes P450 2C9- and 3A4-Mediated Drug Metabolism in Human Hepatocytes. Sci Pharm. 2010 Sep 30;78(3):473-81.
  42. Foster BC, Foster MS, Vandenhoek S, et al. An in vitro evaluation of human cytochrome P450 3A4 and P-glycoprotein inhibition by garlic. J Pharm Pharm Sci. 2001 May-Aug;4(2):176-84.
  43. Ma JL, Zhang L, Brown LM, et al. Fifteen-year effects of Helicobacter pylori, garlic, and vitamin treatments on gastric cancer incidence and mortality.J Natl Cancer Inst. 2012 Mar 21;104(6):488-92.
  44. Filobbos G, Chapman T, Gesakis K. Iatrogenic burns from garlic. J Burn Care Res. 2012 Jan-Feb;33(1):e21.
  45. Stabler SN, Tejani AM, Huynh F, Fowkes C. Garlic for the prevention of cardiovascular morbidity and mortality in hypertensive patients. Cochrane Database Syst Rev. 2012 Aug 15;8:CD007653.
  46. Erian M, McLaren G. Be wary of “natural” therapy in gynecological surgery. International Journal of Women’s Health. 2013:5 345–349.
  47. Watson CJ, Grando D, Fairley CK, et al. The effects of oral garlic on vaginal candida colony counts: a randomised placebo controlled double-blind trial. BJOG. 2014 Mar;121(4):498-506.
  48. Xu S, Heller M, Wu PA, Nambudiri VE. Chemical burn caused by topical application of garlic under occlusion. Dermatol Online J. 2014 Jan 15;20(1):21261.
  49. Ge B, Zhang Z, Zuo Z. Updates on the clinical evidenced herb-warfarin interactions. Evid Based Complement Alternat Med. 2014;2014:957362.
  50. Kwak JS, Kim JY, Paek JE, et al. Garlic powder intake and cardiovascular risk factors: a meta-analysis of randomized controlled clinical trials. Nutr Res Pract. 2014 Dec;8(6):644-54.
  51. Sisson D, Balmer C. A chemical burn from a garlic poultice applied to the face to treat toothache: a case report. Prim Dent J. 2014 Feb;3(1):28-9.
  52. Karabacak E, Aydın E, Kutlu A, Dogan B. An unusual garlic burn occurring on an unexpected area. BMJ Case Rep. 2014 Apr 7;2014.
  53. Ried K. Garlic Lowers Blood Pressure in Hypertensive Individuals, Regulates Serum Cholesterol, and Stimulates Immunity: An Updated Meta-analysis and Review. J Nutr. 2016 Feb;146(2):389S-96S.
  54. Treudler R, Reuter A, Engin AM, Simon JC. A Case of Anaphylaxis After Garlic Ingestion: Is Alliinase the Only Culprit Allergen? J Investig Allergol Clin Immunol. 2015;25(5):374-5.
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  56. Sun YE, Wang W, Qin J. Anti-hyperlipidemia of garlic by reducing the level of total cholesterol and low-density lipoprotein: A meta-analysis. Medicine (Baltimore). May 2018;97(18):e0255.
  57. Taghizadeh M, Hamedifard Z, Jafarnejad S. Effect of garlic supplementation on serum C-reactive protein level: A systematic review and meta-analysis of randomized controlled trials. Phytother Res. Feb 2019;33(2):243-252.
  58. Darooghegi Mofrad M, Milajerdi A, Koohdani F, et al. Garlic Supplementation Reduces Circulating C-reactive Protein, Tumor Necrosis Factor, and Interleukin-6 in Adults: A Systematic Review and Meta-analysis of Randomized Controlled Trials. J Nutr. Apr 1 2019;149(4):605-618.
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  60. Atkin M, Laight D, Cummings MH. The effects of garlic extract upon endothelial function, vascular inflammation, oxidative stress and insulin resistance in adults with type 2 diabetes at high cardiovascular risk. A pilot double blind randomized placebo controlled trial. J Diabetes Complications. May-Jun 2016;30(4):723-727.
  61. Matsumoto S, Nakanishi R, Li D, et al. Aged Garlic Extract Reduces Low Attenuation Plaque in Coronary Arteries of Patients with Metabolic Syndrome in a Prospective Randomized Double-Blind Study. J Nutr. Feb 2016;146(2):427s-432s.
  62. Szulinska M, Kregielska-Narozna M, Swiatek J, et al. Garlic extract favorably modifies markers of endothelial function in obese patients -randomized double blind placebo-controlled nutritional intervention. Biomed Pharmacother. Jun 2018;102:792-797.
  63. Li WQ, Zhang JY, Ma JL, et al. Effects of Helicobacter pylori treatment and vitamin and garlic supplementation on gastric cancer incidence and mortality: follow-up of a randomized intervention trial. Bmj. Sep 11 2019;366:l5016.
  64. Li Z, Ying X, Shan F, et al. The association of garlic with Helicobacter pylori infection and gastric cancer risk: A systematic review and meta-analysis. Helicobacter. Oct 2018;23(5):e12532.
  65. Zhou X, Qian H, Zhang D, et al. Garlic intake and the risk of colorectal cancer: A meta-analysis. Medicine (Baltimore). Jan 2020;99(1):e18575.
  66. Chiavarini M, Minelli L, Fabiani R. Garlic consumption and colorectal cancer risk in man: a systematic review and meta-analysis. Public Health Nutr. Feb 2016;19(2):308-317.
  67. Schimmel J, Camarena-Michel A, Hoyte C. Pediatric Cases Involving Chemical Burns to Garlic Used to Treat Warts. Dermatitis. Jan/Feb 2019;30(1):80-82.
  68. Vargo RJ, Warner BM, Potluri A, et al. Garlic burn of the oral mucosa: A case report and review of self-treatment chemical burns. J Am Dent Assoc. Oct 2017;148(10):767-771.
  69. Hisham A, Mohamed Sukur S, Basiron N. A case of facial burn due to the misuse of garlic face mask for acne. Australas J Dermatol. Nov 2018;59(4):336-337.
  70. Woodbury A, Sniecinski R. Garlic-Induced Surgical Bleeding: How Much Is Too Much? A A Case Rep. Dec 15 2016;7(12):266-269.
  71. Cloarec N, Solas C, Ladaique A, et al. Sub-therapeutic darunavir concentration and garlic consumption; a Mediterranean drug-food interaction, about 2 cases. Eur J Clin Pharmacol. Oct 2017;73(10):1331-1333.
  72. Shaikh SA, Tischer S, Choi EK, et al. Good for the lung but bad for the liver? Garlic-induced hepatotoxicity following liver transplantation. J Clin Pharm Ther. Oct 2017;42(5):646-648.
  73. Esfahani A, Chamlin SL. Garlic Dermatitis on the Neck of an Infant Treated for Nasal Congestion. Pediatr Dermatol. Jul 2017;34(4):e212-e213.
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