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Allium Sativa

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SCIENTIFIC NAME:
Allium sativa
COMMON NAME:
Garlic
  Evidence for Efficacy (Human Data)
   Clinical Trials  (46)
   Observational Studies/Case Reports  (14)
   Traditional and Folk Use  (28)
 Warnings
   Adverse Effects & Toxicity   (63)
   Interactions   (8)
   Contraindications   (7)
  Methods of Preparation
   Contemporary Standardized Methods  (7)
   Folk Methods  (0)
 Formulas/Blends
   Contemporary Formulas   (0)
   Folk Blends   (0)
  Evidence of Activity
   Pharmacodynamics  (88)
   Animal Studies  (84)
   Analytical Chemistry  (37)
   Pharmacokinetics (ADME)  (2)
   Genetics & Molecular Biology  (26)
 Other Information
   Pictures & Distribution Maps   (1)
   Cultivation, Conservation & Ecology   (0)
   Related Links   (4)
  Dynamic Updates
   Live PubMed Searches  (14)
  History of Records
   History of Record (1)
EVIDENCE FOR EFFICACY (HUMAN DATA)
 
Clinical Trials
  "A strategic call to utilize Echinacea-garlic in flu-cold seasons " (review, no abstract) Abdullah 2000
  Cholesterol decreased after 8 weeks in volunteer groups with guggulipid from 212 to 143, with allicin from 148 to 130, and with bengal gram seeds from 157 to 135 Ghorai 2000
  Atherosclerosis treatment with garlic lacks clinical validation Jepson 2000
  Immune-stimulation by low molecular weight sulfur compounds in Garlic (macrophages, natural killer & killer cells, LAK cells, increases of IL-2, TNF & IFN-gamma) make it worthy clinical trials for cancer prevention Lamm 2000
  The only cholesterol parameter that changed was a reduced mean peak particle diameter in pattern A (large LDL) in a study with 50 moderately hypercholesterolemic patients Superko 2000
  22% of presurgical patients reported the use of herbal remedies; especially echinacea, gingko biloba, St. John's wort, garlic & ginseng Tsen 2000
  LDL oxidation was unchanged by garlic in people Byrne 1999
  Arteriosclerotic plaque volume in carotid & femoral arteries decreased 5-18% with continuous intake of high-dose garlic powder in a study of 152 people Koscielny 1999
  Tinea was healed by ajoene (0.6%) & terbinafine (1%) in 73% & 71% after 2 months in a study with 60 soldiers Ledezma 1999
  LDL isolated from people taking 0.8 g DL-alpha-tocopherol acetate or 2.4 g aged garlic extract (AGE) for 7 days was more resistant to Cu2+-mediated oxidation. Raw garlic (6 g) was not effective Munday 1999
  9-18% reduction & 3% regression in plaque volume, decrease in LDL 4%, increase in HDL 8%, lowered blood pressure 7% and opening of K(Ca) ion channels were found in a prospective, 4-year clinical trial of garlic Siegel 1999
  No influence on serum lipoproteins, cholesterol absorption, or cholesterol synthesis in a crossover study with 25 moderate hypercholesterolemia patients Berthold 1998
  New rigorously designed controlled studies show less evidence for lipid lowering properties of garlic; a review Berthold 1998
  Total cholesterol, triglycerides & platelet thromboxane formation decreased and HDL increased in 30 coronary artery disease patients taking garlic for 3 months compared with a placebo group. There was no effect on fibrinogen & glucose levels Bordia 1998
  No significant lipid or lipoprotein changes with 300 mg of garlic powder (Kwai) 3 times per day for 12 weeks in a double blind study with 40 hypercholesterolemia patients Isaacsohn 1998
  "The effect of garlic on hypercholesterolemia in renal transplant patients " (no abstract) Lash 1998
  No significant effect on cholesterol levels by garlic extract (Kwai 300 mg, 3 times a day) in 30 teens with familial hyperlipidemia having fasting total cholesterol over 4.8 mmol/L (> 185 mg/dL) McCrindle 1998
  Platelet aggregation induced by epinephrine or collagen were decreased by aged garlic extract vs. placebo in a 10-month study with moderately hypercholesterolemic men. Platelet adhesion to fibrinogen was reduced 30% Steiner 1998
  Pulse wave velocity (PWV) & pressure-standardized elastic vascular resistance (EVR) were lower in the garlic group of 101 people who took 300 mg/d garlic for over 2 years than in matched controls Breithaupt-Grogler 1997
  "Immunologic aspects of alisate in diabetes mellitus patients " (Russian, no abstract) Mel'chinskaia 1997
  Decreases in cholesterol (11%), triglyceride (34%), LDL (10%) & HDL (19%) in 40 hyperlipid patients who added fish oil (1800 mg EPA + 1200 mg docosahexanoic acid) with garlic powder (1200 mg) capsules Morcos 1997
  No benefit by 900 mg/day dried garlic powder (standardised @ 1.3% allicin) in 115 individuals with 6.0-8.5 mmol/l total cholesterol & 3.5 mmol/l LDL, in contrast to previous meta-analyses that showed reduction in total cholesterol of -0.65 mmol/l Neil 1996
  Decreases in cholesterol 7%, LDL 4% & systolic blood pressure 5.5% by 7.2 g aged garlic extract/d for 6 mo in a double-blind crossover study of 41 moderately hypercholesterolemic men, 5.7-7.5 mmol/L (220-290 mg/dL) Steiner 1996
  Combined treatment of gonococcal arthritis by acupuncture, garlic moxibustion, pricking blood, cupping and drawing hydrarthrus benefited 85% of 116 patients Wang 1996
  Colorectal polyps risk is lowered by vegetables 0.47, fruits 0.65, grains 0.55 and by high carotenoid vegetables, cruciferae, high vitamin C fruits, garlic, and tofu in a study of 488 matched pairs after sigmoidoscopy Witte 1996
  Cholesterol decreased 20%, thromboxane decreased 80% and serum glucose was unchanged after 26 weeks of consuming one clove (about 3 g) of fresh garlic daily Ali 1995
  Unchanged plasma cholesterol, LDL, HDL, triglycerides, or blood pressure in a double-blind, crossover study with hypercholesterolaemia (5.5-8.05 mmol/l) taking Kwai garlic powder tablets 300 mg three times daily for 12 weeks Simons 1995
  Acetaminophen metabolism was nearly unaffected in 16 people taking garlic extract (equivalent to 6-7 cloves) for 3 months Gwilt 1994
  Meta analysis of 16 trials with 952 subjects found total cholesterol & serum triglyceride were lowered by garlic Silagy 1994
  Meta analysis of 8 trials with 415 subjects found 3 had reduced systolic blood pressure and 4 lower diastolic blood pressure but more-rigorously designed and analysed trials are needed Silagy 1994
  Total cholesterol & LDL decreased modestly in a study with 42 people with cholesterol over 220 mg/dl taking 900 mg/d garlic powder tablets for 12 weeks Jain 1993
  43 patients with high cholesterol (230-390) had a modest lowering by garlic-ginkgo combination compared with placebo Kenzelmann 1993
  Peripheral arterial occlusive disease stage II improved slightly in a 12-week study with garlic powder (800 mg/d) Kiesewetter 1993
  Infants who had no exposure to garlic in their mothers' milk during the experimental period spent more time breast-feeding after their mothers ingested garlic capsules Mennella 1993
  Meta analysis of 5 (out of 28) studies finds cholesterol decreased in garlic groups by 9% Warshafsky 1993
  Infant thrush treatment with 0.06/1000 allicin Zhang 1992
  Vasodilation of precapillary arterioles by garlic powder (Kwai, 900 mg) in humans which increases the diameter of erythrocyte column by 8.6% Jung 1991
  Spontaneous thrombocyte aggregation disappeared, skin microcirculation increased 47.6% and decreases in plasma viscosity by 3.2%, diastolic blood pressure by 9.5% and blood glucose by 11.6% Kiesewetter 1991
  Giardia & Hymenolepis treatment with garlic in 36 children Soffar 1991
  Ascaris lumbricoides was not reduced by garlic, 8 gm/d for 5 days to children, as an infusion Campos 1990
  Improvement of blood fluidity and increased fibrinolytic activity by garlic in a double blind study Kiesewetter 1990
  Lower total cholesterol, triglycerides and blood pressure in a double-blind study of 40 hypercholesterolaemic patients taking 900 mg/d garlic powder (equivalent to 2,700 mg fresh garlic Vorberg 1990
  Methodlolgical shortcomings in clinical trials with garlic Kleijnen 1989
  "Garlic and diabetes mellitus phase II clinical trial " (no abstract) Sitprija 1987
  Fibrinolytic activity increased by 72% and 63% within 6 h of administration of raw or fried garlic, respectively Chutani 1981
  Cholesterol decreased in people taking 10 g of raw garlic daily with their diet for two months Bhushan 1979

Observational Studies/Case Reports
  Review of evidence for echinacea, garlic, ginger, ginkgo, St John's wort, and valerian Barrett 1999
  Helicobacter pylori was eliminated in only 1 of 15 people taking 300-mg tablets of dried garlic powder (Li 114; Lichtwer) 3 times a day for 8 weeks Ernst 1999
  Urea breath test was unchanged in 12 Helicobacter pylori infected adults eating fresh garlic (10 sliced cloves) or capsaicin (six sliced fresh jalapenos) Graham 1999
  Hepatopulmonary syndrome & arterial oxygenation improved in some of the 15 patients taking garlic powder capsules daily for 6 months Abrams 1998
  "Effects of eifitol on lipid metabolism in patients with clinically different ischemic heart diseases " (Russian, no abstract) Panchenko 1997
  'The effect of garlic preparation alisat on the level of lipid peroxidation products, activity of various antioxidant enzymes, and blood level of lipoproteins in patients with atherosclerosis " (Russian, no abstract) Mikhin 1996
  Odor of amniotic fluid of pregnant women 45 minutes after ingesting garlic oil Mennella 1995
  Hepatopulmonary syndrome modest improvement in a patient who declined liver transplantation and took large daily doses of powdered garlic Caldwell 1992
  "A comparative study of the efficacy of garlic and eugenol as palliative agents against dental pain of pulpal origin " (no abstract) Diaz 1985
  "Sporotrichosis treated with garlic juice. A case report " (no abstract) Tutakne 1983
  "Garlic in cryptococcal meningitis: a preliminary report of 21 cases " (no abstract) anon 1980
  "Garlic breath odor " (no abstract) Buchan 1974
  "The use of garlic phytoncides in the treatment of pulpitis and periodontitis " (Russian, no abstract) Vital'eva 1968
         Database of evidence-based clinical practice guidelines from the Agency for Healthcare Research and Quality
Traditional and Folk Use
  Garlic & onion are among the oldest cultivated plants. The antimicrobial, antithrombotic, antitumor, hypolipidaemic, antiarthritic and hypoglycemic activities are reviewed Ali 2000
  Garlic & ginseng are consistently among the biggest selling supplements. Garlic & lecithin were the most used supplements in the third National Health and Nutrition Examination Survey (NHANES III) Radimer 2000
  Antihelmintics of Central Italy are Ruta, Cucurbita, Artemisia & Allium sativum while antiparasitics are Juglans, Lupinus, Ruta, Fraxinus, Datura, Artemisia & Allium cepa Guarrera 1999
  Colorectal cancer is associated with a diet high in refined grains & red meat and low in vegetables, coffee & garlic in a study of 223 patients compared with 491 controls Levi 1999
  Attacks of paroxysmal dystonic choreoathetosis, a rare genetic disorder mapped to chromosome 2q31-36, are believed by patients to be softened by eating garlic Matsuo 1999
  Gastric cancer incidence is low in Jiangsu Province, China, where there is high consumption of raw vegetables, fruit, tomatoes, kidney beans, soy & raw garlic Takezaki 1999
  345 breast cancer patients compared with matched controls found risk is reduced by fiber, garlic & onions Challier 1998
  328 prostate cancer patients compared with matched controls found risk lowered by carotene (0.65), zinc (0.73), B vitamins (0.70), garlic (0.56), beans (0.57) Key 1997
  Among 626 hypertensive/diabetic patients 2/3 use herbal medicine. Most used by hypertension patients were Allium sativum, Olea europea, Arbutus unedo, Urtica dioica & Petroselinum crispum Ziyyat 1997
  Colon & rectum carcinoma were not associated with garlic nor leek consumption in the 150-item food frequency questionnaire of the Netherlands Cohort Study with 120,852 people Dorant 1996
  Breast cancer was not associated with garlic nor leek consumption in the 150-item food frequency questionnaire of the Netherlands Cohort Study with 120,852 people Dorant 1995
  Antimutagenic/anticarcinogenic potential of some commonly consumed spices & vegetables such as turmeric, mustard, green leafy & allium species; a review Krishnaswamy 1995
  Colon cancer is inversely associated with consumption of garlic and total vegetables in the Iowa Women's Health Study of 41,837 women aged 55-69 who completed a 127-item food frequency questionnaire Steinmetz 1994
  Allium sativum & Chenopodium ambrosoides were used as anthelmintics in rural Guatemala Booth 1993
  Review of evidence of garlic for prevention of cancer in humans is not conclusive but warrants further research Dorant 1993
  "Antibacterial activity of garlic and onions: a historical perspective " (no abstract) Farbman 1993
  Dietary of the previous 10 years of 268 endometrial cancer patients compared with matched controls found risk increased with fat & protein and lower with fruit & Allium Shu 1993
  "Garlic as cultural historical medicinal plant--truth or superstition? " (no abstract) Johansson 1992
  Interviews with 564 gastric cancer patients vs. 1131 controls indicates lower risk with fresh vegetables, including garlic You 1991
  Early remedies for chronic bronchitis included garlic, pepper, cinnamon & turpentine. Later therapies emphasized coffee, ipecac & potassium nitrate. Modern bronchodilators derived from traditional folk remedies: ephedrine, atropine & theophylline Ziment 1991
  Effects of fractions from Chinese drugs "xiebai" & "dasuan" (roots of Allium bakeri & A. sativum, respectively) on human platelet aggregation Okuyama 1989
  Folk use and continued popularity of ginseng and garlic Dubick 1986
  Bulgarian traditional medicine in the Middle Ages with discussion about garlic Petkov 1986
  "The medical uses of garlic--fact and fiction " (no abstract) Bolton 1982
  Garlic has had a firm place in folk medicine since ancient times. Modern study shows antimicrobial action, lowering of cholesterol, vascular effects and inhibition of thrombocyte aggregation Ernst 1981
  "Effect of dietary garlic and onion on serum lipid profile in Jain community " (no abstract) Sainani 1979
  "Medicinal uses of common Indian vegetables " (no abstract) Vohora 1973
         Dan Moerman's Native American Ethnobotany DB
WARNINGS
 
Contraindications
  Review of the pharmacology, efficacy, safety, and pharmokinetics St. John's Wort, chromium, and garlic used for depression, diabetes, and hypercholesterolemia, respectively. Safety with renal patients is unstudied Duncan 1999
  Review of herb-drug interactions suggests Feverfew, garlic, Ginkgo, ginger, and ginseng may alter bleeding time and should not be used concomitantly with warfarin Miller 1998
  "Effects of aspirin and garlic on cyclooxygenase-induced chemiluminescence in human term placenta " (no abstract) Das 1997
  "Garlic as a possible risk for postoperative bleeding " (case report, no abstract) Burnham 1995
  "Garlic and the risk of TURP bleeding " (case report, no abstract) German 1995
  Collagen induced platelet aggregation decreased with garlic extract in humans but concentrations were higher than normally attainable Morris 1995
  "Garlic and postoperative bleeding " (no abstract) Petry 1995
Adverse Effects & Toxicity
  "Allergic contact dermatitis from diallyl disulfide " (no abstract) Fernandez-Vozmediano 2000
  "Allergenic cross-reactivity in the Liliaceae family " (no abstract) Sanchez-Hernandez 2000
  Anti-alliinase antibodies in human serum contain the motif-GKXVXX- Tchernychev 2000
  Role of certain foods--including garlic, onion & leeks in provoking and exacerbating pemphigus (skin disease) Brenner 1999
  "Severe toxic contact dermatitis caused by garlic " (no abstract) Eming 1999
  Case of a patient with a positive type-IV patch test for diallyl disulfide and strong, non-irritant reactions after 20 min and 24 hrs in the scratch chamber test with fresh total garlic Jappe 1999
  Colchicum autumnale confused with wild garlic (Allium ursinum) resulted in death of one and a 3-day episode of nausea, vomiting and watery diarrhea in the other person Klintschar 1999
  Case of anaphylactic reaction after eating young garlic in a woman with prior history of allergy & exercise-induced anaphylaxis who had IgE-binding bands at 12 kDa to young garlic, garlic, onion & leek extracts Perez-Pimiento 1999
  "A case of garlic allergy " (no abstract) Asero 1998
  Garlic sensitization was shown by a bronchial challenge test in 7 out of 12 garlic workers Anibarro 1997
  Occupational dermatitis of the fingers from onion, garlic & tulips Bruynzeel 1997
  Time for the first platelet aggregate to appear in pial arterioles was delayed by 100 mg/kg garlic or by 25 mg/kg aspirin (acetyl salicylic acid) el-Sabban 1997
  "Garlic burns of the breast " (no abstract) Roberge 1997
  Low doses of garlic (50 mg/kg) to rats had little effect on lung & liver tissues as compared to controls whereas high doses (500 mg/kg) resulted in profound changes in lung & liver tissues Alnaqeeb 1996
  "Can inhalation of garlic dust cause asthma? " (no abstract) Armentia 1996
  Allergic contact dermatitis to garlic usually has a typical clinical presentation but can be masked by another form of hand dermatitis. Patch testing with 1% diallyl disulfide in petrolatum is recommended if suspected Delaney 1996
  "Garlic burns mimicking herpes zoster " (no abstract) Farrell 1996
  Of 1000 dermatology patients, 5 had occupational (food handling) allergy to spices, including garlic, cinnamon, ginger, allspice and clove. Although rare, it should not be overlooked Kanerva 1996
  A case of occupational asthma caused by several aromatic herbs: thyme, rosemary, bay leaf, and garlic, the latter inducing greatest RAST reactivity Lemiere 1996
  Case of superficial pemphigus associated with eating garlic Ruocco 1996
  Pemphigus is induced, in vitro, with skin samples from patients cultured with allylmercaptan, allylmethylsulfide & allylsulfide from garlic Brenner 1995
  "Effects of garlic extract on platelet aggregation " (no abstract) Myers 1995
  Human serum contains natural antibodies to alliinase (Alliin lyase) and mannose-specific lectin from garlic Tchernychev 1995
  Pollen allergy patients have more food allergies, especially peanut, garlic, tomato, onion; and fruits, such as peach; and animal foods, such as egg (white) and pork Boccafogli 1994
  "Garlic-induced systemic contact dermatitis " (case report, no abstract) Burden 1994
  Ornithine decarboxylase activity (ODC) is increased by allyl mercapton which might contribute to hepatocarcinogenesis Takada 1994
  "Garlic burns " (case report, no abstract) Garty 1993
  "Three cases of occupational asthma and rhinitis caused by garlic " (no abstract) Seuri 1993
  A single large dose, 500 mg/kg i.p. decreased liver enzymes whereas 50 mg/kg i.p. for 5 days increased them in rats Dalvi 1992
  "Allergic contact dermatitis from garlic " (no abstract) McFadden 1992
  300 & 600 mg/kg/24 h of a Garlic bulb aqueous extract for 21 days causes toxic effects in rats Fehri 1991
  8 patients developed contact dermatitis after rubbing the cut end of a fresh garlic bulb onto the skin to treat fungal and other infections at the groin, neck, lower limb, hand or face. Patch tests with garlic extract were all negative Lee 1991
  "Allergic contact dermatitis due to garlic (Allium sativum) " (no abstract) Lembo 1991
  "An equine case of urticaria associated with dry garlic feeding " (no abstract) Miyazawa 1991
  Increased weight of seminal vesicles & epididymides of male mice after 3 months of garlic water extract in drinking water (100 mg/kg/d) al-Bekairi 1990
  "Factitial dermatitis induced by application of garlic " (case report, no abstract) Kaplan 1990
  Case of spontaneous spinal epidural hematoma causing paraplegia secondary to a qualitative platelet disorder from excessive garlic ingestion Rose 1990
  Rise in urea & D-aspartate aminotransferase and inhibition of alkaline phosphatase in serum in rats fed garlic extract (20 ml/kg) for 10 days. Garlic oil (100 mg/kg) caused lethal acute pulmonary oedema Joseph 1989
  "Contact allergy to garlic used for wound healing " (no abstract) Bojs 1988
  Botulism associated with commercial chopped garlic in soybean oil St Louis 1988
  Hand eczema among 50 caterers was associated with fish & garlic Cronin 1987
  Case of a child who sustained partial thickness burns from a garlic-petroleum jelly plaster Parish 1987
  Sperm motility was inhibited by 7.5 mg/ml of allitridum from garlic Qian 1986
  11 cases of Allium contact dermatitis of the fingers of housewives Fernandez de Corres 1985
  Case report and literature review of allergy to onion & garlic, usually an eczema of the fingertips. Risk groups include grocers, housewives & cooks Lautier 1985
  Genotoxic effects of orally administered garlic and turmeric were not found with bone-marrow cells of mice Abraham 1984
  LD50 of garlic extract by P.O., I.P. & S.C. administration were estimated over 30 ml/kg in rats & mice Nakagawa 1984
  "Suspected wild garlic poisoning in sheep " (no abstract) Stevens 1984
  Garlic-sensitive patients showed positive tests to diallyldisulfide, allylpropyldisulfide, allylmercaptan and allicin Papageorgiou 1983
  Erratic pulse rates & abnormal ECG, weight loss, lethargy, dehydration & tender skin in toxicological test of garlic in 8 rats for 28 days Ruffin 1983
  "Immediate and delayed sensitization to garlic " (case report, no abstract) Campolmi 1982
  "Occupational allergy secondary inhalation of garlic dust " (no abstract) Couturier 1982
  "Effects of chronic administration of garlic (Allium sativum Linn) on testicular function " (no abstract) Dixit 1982
  Repeated exposure to garlic dust induced severe asthma in an atopic patient who also had high levels of garlic specific IgE Lybarger 1982
  Case of garlic dust precipitated asthma in a person with IgE anti-garlic antibodies Falleroni 1981
  "Contact dermatitis caused by Allium sativum " (Romanian case report, no abstract) Martinescu 1981
  "Contact sensitivity to garlic (Allium) " (case report, no abstract) Mitchell 1980
  "Occupational eczema from garlic and onion " (no abstract) van Ketel 1978
  53 patients with contact dermatitis on the fingertips had positive patch tests garlic > onion > tomato > carrot. The antigens in garlic & onion were extractable in water, ether, acetone, or alcohol Sinha 1977
  Contact allergy by metal, onion & garlic in food handlers Hjorth 1976
  "Contact dermatitis to garlic; crossreactivity between garlic, onion and tulip " (no abstract) Bleumink 1973
  "Allergic contact dermatitis to garlic " (no abstract) Bleumink 1972
  "Garlic food allergy with symptoms of Meniere's disease " (Czech, no abstract) Benes 1966
Interactions
  Plausible cases of herb-drug interactions include bleeding when warfarin is combined with ginkgo (Ginkgo biloba), garlic (Allium sativum), dong quai (Angelica sinensis), or danshen (Salvia miltiorrhiza) Fugh-Berman 2000