liquid chromatography with high performance. Garlic extract was discovered to have 81.37 percent allicin.
What other names does allium sativum go by?
It has been advertised that garlic (Allium sativum) possesses antibacterial and antiparasitic qualities. Numerous organosulfur compounds, such as allicin, as well as a variety of nonsulfur chemicals, such as steroid aponins and different organoselenium compounds, are among the probable active ingredients in garlic (NRC 2009). Garlic’s high sulfur content has been hypothesized to aid in blood purification. Garlic is predominantly fed to horses in the equine industry for its alleged ability to repel insects. Benefits for respiratory health (changes in mucus’ physical characteristics) have also been asserted.
Cysteine sulfoxides and glutamylcysteines form a complicated mixture inside the entire garlic bulb of the garlic plant. The sulfoxidases cleave to the active form of thiosulfinate allicin when the bulb is disturbed (Munday & Munday, 2001). The putative active chemicals in garlic are believed to have complicated chemistry that underlies any potential biological activity (NRC 2009).
Is allicin the same thing as garlic?
One of the primary active ingredients derived from garlic is allicin. It may decrease blood sugar, cholesterol, and blood pressure as well as help prevent some malignancies. It may aid in post-workout muscle recovery and infection prevention. Supplemental allicin poses low hazards.
The most allicin-containing garlic is it?
Cooking characteristics: When roasted, this delicious bulb caramelizes. A delicate and subtle garlic flavor that enhances rather than overpowers other flavors. Siberian is ideal for light soups, dips, stir-fries, and sauces that call for just a bit of creamy garlic taste. For those who like a more subdued garlic flavor, there are several of options. For this adaptable allium, look at our recipes with garlic.
Imagine a box of nicely cured, bottoms-up Siberian bulbs that are about to be delivered to a grateful garlic gardener.
Originally, Siberia was a part of Europe. Traditional uses for it in Russian and Eastern European cuisine. Alaska may have received the garlic at some point in the 19th century. According to legend, it was exchanged for fresh vegetables at the docks.
Special Features: If you are worried about becoming sick, this garlic is for you. When compared to other varieties of garlic, Siberian has one of the highest allicin concentrations. Garlic contains allicin, a physiologically active antibacterial compound that may be beneficial to health. Allicin levels are also high in porcelain garlic varieties including Georgian Crystal, Parvin, and Romanian Red.
Organosulfur chemicals, which destroy bacteria on contact, are present in all garlic. The quantity of organosulfur compounds varies according to the type of garlic and the growth environment. More organosulfur compounds are present in garlic produced on sulfur-rich soil. Because manure has a high sulfur content by nature, organically grown garlic is particularly healthful.
Due to Siberian garlic’s mild flavor, you can use more of it while still reaping its health advantages. Large, white bulbs of this gorgeous garlic typically have pink to purple striations. Compared to larger bulbs, smaller bulbs typically offer more color. lovely near the bulb or the box!
Considerations for Growing: Siberian garlic is a simple variety to grow, similar to Georgian Crystal. According to our consumers, this garlic thrives in both cold and hot conditions. Large bulbs and lovely purple flowers are produced by the graceful, medium-tall plants. Plants have thin stems that conceal bigger bulbs. This species of cloves have lovely, silky, firm wrappers that are enjoyable to run between your fingers.
After severe spring frosts, Siberian is subject to yellow tips on leaves. The good health and robust vigor of this plant are unaffected by the yellow tips, though! For tips on how to cultivate large, healthy bulbs of garlic, visit our article on growing garlic.
25–35 huge cloves or 35–45 medium cloves per pound of cloves. The huge bulbs typically have 5 to 9 hefty cloves. These figures are approximations and may differ somewhat.
TWO MINUTES IN THE FRYING PAN DESTROYS ALL THE HEALTH BENEFITS OF GARLIC
The advantages of garlic for health are well known. The enzymes lipoxygenase and cyclooxygenase, which produce pro-inflammatory prostaglandins and thromboxanes, are inhibited by the abundance of antioxidants in this food, which also have potent antibacterial, antiviral, and anti-inflammatory capabilities.
The main active component of garlic, allicin, has been found to almost completely deactivate when heated in the past ten years, according to a team of chemists.
Allicin is produced when the garlic protein alliin and the heat-sensitive enzyme alliinase come together. Allicin must be chewed (raw), crushed, or sliced garlic in order to be released.
By making ONE SIMPLE CHANGE, you may alter this situation while maintaining all of garlic’s health advantages.
Garlic can be crushed, chopped, or minced. Keep it away from heat for 10 minutes. The most allicin is produced and preserved while cooking at this time. So you can cook, sauté, bake all you want and still get the medicinal benefits.
S-Allyl-L-cysteine sulfoxide (Alliin)
In mouse investigations, it was discovered that alliin administered orally was completely absorbed and reached the liver and plasma without being changed into allicin. Garlic cloves that are still whole lack thiosulfinates (like allicin), and the stomach cannot produce any since the presence of acid would cause alliinase to be irreversibly blocked (6).
Allicin and allicin-derived chemicals’ absorption and metabolism (see Figure 2) are only poorly understood (7). Up to 24 hours after consuming 25 g of raw, allicin-rich garlic, neither serum nor urine in humans have shown any signs of allicin (8). Allicin likely degrades to release a number of volatile substances, including DAS and DADS, both before to and following intake in garlic preparations. After consuming garlic, these organosulfur compounds are converted into allyl mercaptan, allyl methyl sulfide, and allyl methyl disulfide, which have been found in human breath (9-11). Although a variety of allicin-derived chemicals have been linked to a range of biological activities, it is still unclear which of these compounds or metabolites really enter target organs (5). Within four hours of consuming garlic, allyl methyl sulfide but not allyl mercaptan have been found in urine, indicating that this molecule is quickly absorbed into circulation (11). Even after consuming up to 25 g of fresh garlic or 60 mg of pure allicin, other allicin-derived substances such as diallyl sulfides, ajoenes, and vinyldithiins have not been found in human blood, urine, or feces (5). These results imply that allicin and substances generated from allicin are rapidly metabolized if they are ingested.
Glutamyl-S-allyl-L-cysteine and derivatives
Since metabolites of these compounds have been detected in human urine after garlic ingestion, it is believed that glutamyl-S-allyl-L-cysteine is absorbed intact and degraded to S-allyl-L-cysteine (SAC) and trans-S-1-propenyl-L-cysteine (see Figure 3). (12, 13). It has been discovered that consuming aged garlic extract, a commercial garlic product that includes SAC, raises plasma SAC concentrations in people (14-16). Animals fed SAC have shown signs of SAC in their plasma, liver, and kidney (17). In clinical trials including the consumption of garlic, water-soluble organosulfur compounds like SAC and its metabolite, N-acetyl-S-allyl-L-cysteine, may be utilized as trustworthy markers of compliance (6, 18).
Low levels of glutathione, a significant intracellular antioxidant, or an excess of reactive oxygen species (ROS) can damage biological macromolecules as a result of oxidative stress and contribute to the onset and progression of pathological diseases. Allicin from garlic reduced ROS production and elevated glutathione levels in endothelial cells, which line the inner wall of blood vessels (19). By inhibiting pro-inflammatory pathways such as mitogen-activated protein kinase (MAPK) and phosphoinositide 3-kinase (PI3K)/protein kinase B (Akt)/glycogen synthase kinase 3 (GSK3) signaling pathways, oral administration of allicin to mice reduced ROS production and prevented ROS-induced cardiac hypertrophy (20). It is believed that allicin interacts with glutathione when crossing cell membranes to generate SAMG (Figure 2), which might increase the antioxidant activity of allicin (19).
Additionally, it was discovered that allicin increased the expression of glutamate-cysteine ligase (GCL), the rate-limiting enzyme in glutathione synthesis, as well as other Phase II detoxifying and antioxidant enzymes. This was most likely accomplished by activating the nuclear factor E2-related factor 2 (Nrf2)-dependent pathway (19). In the cytosol, the protein Kelch-like ECH-associated protein 1 (Keap1) is a binding site for the transcription factor Nrf2. Keap1 releases Nrf2 in response to oxidative stress signals. When Nrf2 is released, it moves to the nucleus where it binds to the antioxidant response element (ARE) found in the promoter of genes encoding antioxidant/detoxifying enzymes and scavengers. Numerous mediators of the antioxidant response, such as GCL, glutathione S-transferases (GSTs), thioredoxin, NAD(P)H quinone oxidoreductase 1 (NQO-1), and heme oxygenase 1 (HO-1), are encoded by Nrf2/ARE-dependent genes (21). Oil-soluble organosulfides, such as DADS and DATS (see Figure 2), have been demonstrated to activate the Nrf2-dependent antioxidant pathway, just like allicin (4). For instance, the ability to cause Nrf2-dependent HO-1 activation was linked to the antioxidant and cytoprotective properties of DADS against acute ethanol-induced liver injury in mice (22). DATS prevented oxidative damage and apoptosis brought on by high glucose in both in vitro and experimental diabetic rats via activating PI3K/Akt-dependent Nrf2 antioxidant signaling (23).
Additionally, it has been demonstrated that aged garlic extract increases the production of antioxidant enzymes via the Nrf2/ARE pathway (24). By preventing the cisplatin-induced reduction of glutathione level, Nrf2 expression, and activity of several antioxidant enzymes (catalase, glutathione reductase, and glutathione peroxidase), SAC, a major organosulfur compound in aged garlic extract, prevented renal damage caused by ROS in cisplatin-treated rats (25). SAC also shielded neurons in wild-type mice from oxidative damage and apoptosis, but not in mice lacking a normal Nrf2 signaling pathway (26).
Nitric oxide (NO) production, which is facilitated by endothelial nitric oxide synthase (eNOS), is essential for defending the vascular endothelium from oxidative and inflammatory assaults (27). Vascular endothelial dysfunction caused by ROS-induced NO inactivation can contribute to a number of diseases including atherosclerosis, hypertension, cardiovascular disease, and disorders of the central nervous system (27, 28). Interestingly, 2 g of fresh garlic intake increased NO plasma concentrations in healthy participants within two to four hours (29). eNOS activity and NO bioavailability were protected by DADS and DATS in cultivated endothelial cells when they were exposed to oxidized low-density lipoprotein (LDL) (30). Allicin showed antioxidant and anti-inflammatory benefits in a rat model of traumatic brain injury, reducing brain edema, neurological impairments, and apoptotic neuronal death, in part by raising Akt-mediated eNOS activity (31). In various experimental settings, it was also discovered that aged garlic extract and SAC stimulated the production of NO (32). SAC restored electrically-induced penile erection in diabetic rats in a model of erectile dysfunction by promoting eNOS activity and suppressing the expression of the NADPH oxidase (Nox) responsible for ROS overproduction (33).
Anti-inflammatory activity
Organosulfur compounds produced from garlic have been shown to suppress cytokines, chemokines, adhesion molecules, and enzymes like cyclooxygenase (COX), lipoxygenase (LOX), and inducible nitric oxide synthase (iNOS), which are mediators of the inflammatory response (34-36). Nuclear factor-kappa B (NF-B) is a DNA-binding transcription factor that activates the COX-2 gene as well as other pro-inflammatory genes and genes necessary for cell growth, adhesion, survival, and differentiation. Organosulfur compounds’ anti-inflammatory actions come from their capacity to prevent pro-inflammatory stimuli from activating pro-inflammatory pathways such NF-B, MAPK, and PI3K/Akt-dependent signaling pathways (4). By restricting LPS binding to toll-like receptor 4 (TLR4) and preventing the overexpression of TLR4 and the TLR4-associated protein MyoD88, DATS prevented bacterial lipopolysaccharide (LPS)-induced macrophage activation (37). NF-B-dependent production of COX-2, iNOS, tumor necrosis factor (TNF), and interleukin-1 (IL-1) that is stimulated by LPS was likewise reduced by DATS (37). In a mouse model of inflammation, the pro-inflammatory cytokines TNF-, IL-6, and monocyte chemotactic protein-1 (MCP-1) had lower serum concentrations when DATS reduced LPS-induced paw edema (36).
Hepatocytes’ ability to synthesize cholesterol has been reported to be reduced by garlic and organosulfur compounds produced from it (38). S-allylcysteine and ajoene, two organosulfur compounds generated from garlic, have been discovered to inhibit 3-hydroxy-3-methylglutaryl-coenzyme A reductase (HMG-CoA reductase), a vital enzyme in the route that produces cholesterol (39, 40). Compounds produced from garlic may similarly block sterol 4-methyl oxidase and other enzymes in this pathway (41).
Acute thrombotic events and blood artery narrowing have both been linked to an increase in platelets’ propensity to aggregate. Numerous organosulfur compounds produced from garlic have been identified to prevent platelet aggregation in a test tube (42-44). The fibrinogen-binding activity of the platelet glycoprotein IIb/IIIa fibrinogen receptor was reported to be downregulated by aged garlic extract, which may also reduce intraplatelet calcium mobilization (45, 46). (42).
The key characteristics of vascular disorders, such as atherosclerosis and coronary restenosis (when treated arteries become clogged again), include the proliferation and migration of normally quiescent VSMCs (47). Limited cell culture research revealed that organosulfur compounds from garlic could prevent the proliferation and migration of VSMCs, while the significance of these findings for human cardiovascular disease is still unclear (39, 48, 49).
The development of atherosclerosis has been linked to an increase in plasma levels of oxidized low-density lipoprotein (LDL). By stimulating the production of vascular cell adhesion molecules, oxidized LDL may promote the recruitment of inflammatory white blood cells from the circulation to the artery wall. By reversing oxidized LDL-induced suppression of PI3K/Akt and cAMP response element binding protein (CREB) signaling pathways, DADS and DATS reduced the expression of adhesion molecules E-selectin and vascular cell adhesion molecule-1 (VCAM-1) on endothelial cell surfaces (50).
In order to prevent cardiovascular disease, normal arterial function must be maintained. Some body cells create hydrogen sulfide (H2S), a gaseous signaling molecule that dilates blood arteries and may thus have cardioprotective qualities (51, 52). By controlling the opening and closing of potassium channels and/or boosting the NO-dependent signaling pathway, H2S generation may contribute to the relaxation of vascular smooth muscle cells (reviewed in 53). According to a study, red blood cells in vitro transform chemicals from garlic into hydrogen sulfide (54). However, a large dose of raw garlic consumed by humans does not result in an increase in breath hydrogen sulfide levels, indicating that there is little in vivo conversion of garlic components to hydrogen sulfide (11).
Keep in mind that the antioxidant and anti-inflammatory properties of garlic may also contribute to its possible effects on cardiovascular health.
Inhibition of the metabolic activation of carcinogens: Some chemical carcinogens are not active until they have been transformed by Phase I biotransformation enzymes, such as those from the cytochrome P450 (CYP) family. In several animal models, the development of cancer is prevented by the inhibition of specific CYP enzymes involved in carcinogen activation (55). Particularly, it has been discovered that DAS and its metabolites suppress CYP2E1 activity both in vitro(56, 57) and when given orally to animals in large dosages (58, 59). Humans who were given garlic oil and DAS orally showed indications of reduced CYP2E1 activity (60-62).
Phase II detoxifying enzyme induction: Reactions catalyzed by phase II detoxifying enzymes typically support the body’s removal of medications, poisons, and cancer-causing substances. Therefore, improving the removal of possible carcinogens by raising the activity of phase II enzymes such glutathione S-transferases (GSTs) and NQO-1 may help prevent cancer (see the Nrf2-dependent antioxidant pathway) (63). Oral administration of organosulfur compounds and preparations of garlic was reported to boost the expression and activity of phase II enzymes in a number of tissues in animal experiments (64-66). By blocking CYP2E1-mediated CCL4 metabolic activation and upregulating Nrf2 downstream genes for NQO-1, HO-1, GCL, GST, and superoxide dismutase (SOD1), for instance, DADS protected rodent liver against carbon tetrachloride (CCl4; an environmental pollutant)-induced lipid peroxidation and cell necrosis (67, 68).
The cell cycle is strictly controlled in healthy cells to guarantee accurate DNA replication and chromosomal segregation before cell division. The cell cycle can briefly halt at checkpoints to allow for repair when errors occur during DNA replication, chromosomal segregation, or in cases of DNA damage. When repair is unsuccessful, apoptosis begins. Cancer cells can divide uncontrollably because of broken checkpoints and apoptosis evasion (69). In cell culture research, it has been discovered that the organosulfur substances allicin, DAS, DADS, DATS, ajoene, and SAMC cause cell cycle arrest when introduced to cancer cells (reviewed in 4, 70). DATS decreased the frequency of poorly differentiated prostate tumors and restricted the growth of lung metastases in mice with genetically altered prostate adenocarcinomas (71). DATS was demonstrated to suppress apoptosis and signs of invasion but not neuroendocrine differentiation, which is a hallmark of prostate cancer malignancy (71). Inhibition of cell proliferation by aged garlic extract was linked to a decrease in the prevalence of precancerous lesions and dysplastic adenomas, but not adenocarcinomas, in a rat model of chemically induced colon cancer (72).
Apoptosis is a physiological process that causes cells that are genetically defective or unnecessary to die on their own accord. Cancerous and precancerous cells are resistant to apoptosis-inducing signals (73). When added to numerous cancer cell lines maintained in culture, organosulfur compounds produced from garlic, such as allicin, ajoene, DAS, DADS, DATS, and SAMC, have been reported to induce apoptosis (reviewed in 4, 70). In an animal model of oral cancer, oral treatment of S-allylcysteine with aqueous garlic extract has been shown to increase apoptosis (74, 75). By limiting oxidative damage to lipids and DNA and by promoting apoptosis, garlic oil decreased the prevalence of N-nitrosodiethylamine-induced liver nodules (76). Garlic oil enhanced the expression of pro-apoptotic effectors including Bax and Caspase-3 and downregulated the expression of arrestin-2, Bcl-2, and Bcl-X, which are anti-apoptotic genes (76).
Invasive tumors need to undergo a process known as angiogenesis to produce new blood vessels to support their rapid growth. Several organosulfur compounds, including alliin, DATS, and ajoene, have been shown to have anti-angiogenic effects in in vitro or ex vivo studies (70). DADS prevented the production of MCP-1, a chemokine that encourages tissue remodeling, angiogenesis, and metastasis, when it was triggered by TNF in human breast cancer cells (77). Additionally, it was discovered that aged garlic extract inhibited endothelial cell growth, loss of adhesion, motility, and tube formation in vitro angiogenesis (78).
Antimicrobial activity
Researchers have discovered that garlic extracts contain antimicrobial and antifungal effects (79, 80). Garlic’s antibacterial action is thought to be significantly influenced by thiosulfinates, particularly allicin (80-82). DATS and ajoene, two chemicals generated from allicin, also exhibit some antibacterial action in vitro (5). Randomized controlled experiments using oral garlic formulations have not, to date, produced conclusive proof of such activity in people (83-85). In a tiny randomized controlled trial, it was discovered that using 1% ajoene cream to the skin twice daily was as successful at treating tinea pedis (the fungal skin ailment known as athlete’s foot) (86). In a separate preliminary randomized controlled trial, circulating immune innate cells (T-lymphocytes and natural killer (NK) cells) from healthy adults supplemented with aged garlic extract proliferated more favorably in ex vivo culture than those from volunteers who took a placebo, indicating a greater capacity to combat pathogens. After 90 days of supplementation with aged garlic extract or a placebo, the frequency of self-reported illnesses was comparable between the groups, but aged garlic extract significantly lessened the intensity of self-reported cold or flu symptoms (87).
Cardiovascular disease
The discovery that those who lived close to the Mediterranean basin had reduced cardiovascular disease mortality rates sparked interest in garlic and its ability to prevent cardiovascular disease (88). Although garlic is frequently used in Mediterranean cooking, several aspects of the “Mediterranean diet” have been suggested to explain its cardioprotective properties (89). Numerous intervention trials have investigated the effects of garlic supplements on cardiovascular disease risk variables, despite the fact that few observational studies have looked at links between garlic consumption and the risk of cardiovascular disease.
One of the initial phases in the development of blood clots that might block cerebral or coronary arteries, resulting in myocardial infarction or ischemic stroke, respectively, is platelet aggregation. Garlic’s ability to prevent platelet aggregation has been demonstrated mostly through in vitro studies and a select few ex vivo testing. Four of the ten randomized controlled trials that examined the antithrombotic properties of garlic preparation found that supplementing with garlic significantly reduced ex vivo platelet aggregation compared to placebo (reviewed in 90). The immediate impact of one big dose of garlic oil (extracted from 9.9 g of fresh garlic) on ex vivo platelet aggregation was examined in a small randomized controlled experiment in 12 healthy people since garlic oil extract in particular may have antithrombotic action (91). Adenosine diphosphate (ADP) or collagen-induced aggregation evaluated four hours after ingestion were not affected by the garlic oil extract, whereas adrenaline-induced platelet aggregation was mildly affected (12 percent reduction). Another study conducted on 14 healthy adults revealed that aged garlic extract reduced the fibrinogen binding activity of the platelet’s glycoprotein IIb/IIIa fibrinogen receptor, which in turn prevented ADP-stimulated platelet aggregation (46).
Mixed results were found in a recent comprehensive evaluation of randomized controlled trials looking at the impact of supplementing with different garlic preparations on serumlipid profiles in people with elevated and normal serum cholesterol levels (92). The most current and thorough meta-analysis evaluated the findings of 39 randomized controlled studies that examined the impact of garlic products on serum cholesterol concentrations and were published between 1955 and 2011. (93). These 39 studies involved 2,298 adults (mean age, 49.5 years), employed a true placebo, and lasted at least two weeks. Garlic-only formulations were used in these studies. Most of the included studies enrolled participants with higher-than-normal baseline total cholesterol (>200 mg/dL [>5.2 mmol/L], 29 trials), and they lasted longer than eight weeks (30 trials). When compared to a placebo, the authors discovered that garlic preparations dramatically reduced both total cholesterol and low-density lipoprotein (LDL) cholesterol. Garlic supplementation resulted in a little increase in HDL cholesterol levels while having no effect on triglyceride levels. All of the garlic preparations that were given out—garlic powder, aged garlic extract, garlic oil, and fresh garlic—were well tolerated and only somewhat uncomfortable for the stomach and breath (93).
Although using garlic supplements for at least two months can lower total- and LDL-cholesterol levels in people with high total cholesterol, the advantages could only be temporary (90, 92). Future research might concentrate on finding strategies to maximize the potential advantages of garlic preparations on blood lipids because it is still unclear whether garlic has long-lasting effects that lower lipid levels.
Assessments of the impact of garlic supplementation on the development of human atherosclerosis have been made in a very small number of research. 900 mg of dried garlic per day was tested in one early German study using ultrasound imaging to determine how it affected the development of atherosclerotic plaque in the carotid and femoral arteries (94). After four years, there was no discernible difference in plaque volume between men taking garlic (+1.1%) and men taking the placebo (+5.5%) in women taking the placebo (+53.1%) compared to women taking the supplement containing garlic (-4.6%). (94, 95). In a smaller pilot study, 19 adults who were already taking HMG-CoA reductase inhibitors (lipid-lowering medications also referred to as statins) had their coronary artery calcium measured using electron-beam computed tomography to determine the impact of supplementing with aged garlic extract on the development of atherosclerosis (18). After a year, those receiving aged garlic extract experienced considerably reduced increases in coronary artery calcium score compared to those taking a placebo. However, despite the fact that coronary calcium scores may be a valid predictor of future cardiac events in asymptomatic participants, it may not be in symptomatic patients (96, 97). In a recent double-blind, controlled study, 72 participants (55 at study completion) at high risk of coronary heart disease were randomized to receive either 2,400 mg of aged garlic extract or a placebo for 52 weeks. The extent of coronary atherosclerosis was assessed with cardiac computed tomography angiography (98). The results suggested that aged garlic extract significantly reduced the extent of coronary plaques with low-attenuation area (a type of vulnerable plaques prone to rupture) when compared to placebo (99, 100), but there were no differences between the treatment and placebo groups in terms of total plaque volume or the proportions of non-calcified plaques and dense calcium (98).
Garlic may lower blood pressure, although most systematic reviews and/or meta-analyses of randomized controlled trials have produced conflicting results. This may be because most of these studies included both normotensive and hypertensive participants (90, 101-105).
Daily intake of aged garlic extract (1.2 g of which contained 1.2 mg of S-allyl-L-cysteine [SAC]) was shown to significantly lower SBP by 11 mm Hg and DBP by 6 mm Hg on average in 50% to 60% of participants in a recent 12-week, randomized, placebo-controlled trial in untreated hypertensive subjects, but blood pressure reductions were not reported in 40% to 50% of participants (110). Future research should investigate if interindividual variations in nutritional status and genetic variants can account for variations in blood pressure response to treatment with garlic (53, 110).
Overall, short-term supplementation with garlic seems to efficiently lower blood pressure in hypertensive patients with little negative effects.
According to the findings of randomized controlled trials, using garlic supplements may somewhat enhance serumlipid profiles in those with high serum cholesterol and lower blood pressure in hypertensive subjects. It is yet unknown if taking supplements of garlic will lower atherosclerosis or stop cardiovascular events like myocardial infarction or stroke.
Gastric cancer risk is significantly increased by infection with some strains of the Helicobacter pylori (H. pylori) bacteria. There is limited proof that high garlic intakes or garlic supplements may help prevent or eradicate H. pylori infection in humans, even though organosulfur compounds and garlic preparations may be able to inhibit the growth of H. pylori in the lab (118, 119). (120). In Turkey or China, higher garlic consumption was not linked to a significantly decreased prevalence of H. pylori infection (121, 122). Furthermore, garlic supplementation was not proven to be useful in curing H. pylori infection in people in clinical trials utilizing garlic cloves (123), aged garlic extract (84), steam-distilled garlic oil (84, 124), garlic oil macerate (125), or garlic powder (126).
A 12-month supplementation study with aged garlic extract looked at the effects on adenoma growth and recurrence in 37 patients with colorectal adenomas. Patients receiving a high dose of aged garlic extract had much fewer and smaller adenomas than those receiving a much lower amount (0.16 mL/day) (131, 132). To find out whether garlic or garlic extracts can significantly lessen adenoma progression to advanced cancer and recurrence, larger randomized controlled trials are required.
In a small, placebo-controlled intervention study, supplementing with 500 mg/day of aged garlic extract for six months did not stop the decline in quality of life brought on by the progression of the disease and the side effects of chemotherapy in 50 cancer patients (42 with liver cancer, seven with pancreatic cancer, and one with colon cancer) (133). However, the active therapy restricted the drop in natural killer cell activity and count that comes with the development of stomach cancer and lowers patient survival (133).
At this time, there is insufficient data from trials, and findings from observational studies do not support the idea that consuming large amounts of garlic can prevent cancer in people (112).