Apple Cider Vinegar
Scientific Name(s): Malus pumila Mill.
Common Name(s): Apple cider vinegar
Medically reviewed by Drugs.com. Last updated on May 19, 2021.
Clinical data are limited and results are equivocal for common claims related to apple cider vinegar use for management of glucose and lipid disorders.
Dosing is not well established. Misbranding and extreme variability among commercially available products in terms of content and dosing recommendations have been reported.
Severe allergy to apples.
Apple cider vinegar is "generally recognized as safe" (GRAS) when used as food. Avoid amounts greater than those found in food because safety is unproven.
Cases of dermal chemical burns as a result of topical application of apple cider vinegar home remedies for moles and warts have been reported, particularly when occlusive dressings have been applied.
No data. Hypokalemia and osteoporosis were observed in a young woman consuming excessive amounts (250 mL/day) for several years.
- Rosaceae (rose)
Apples are grown in temperate climates throughout the world and are widely available in commercial markets. About 2,500 known varieties (cultivars) of apples are grown in the United States, with more than 7,500 varieties grown worldwide. The fruit is termed a "pome."Lewis 2004 The cultivated apple is thought to have originated in central Asia from the wild species Malus sieversii (Ledeb.) M. Roem. The juice from the fermented fruit, known as cider, is used to make apple cider vinegar.
The fruit juice from apples has been consumed fresh, distilled into apple brandy, or fermented as cider, which can be subsequently bioconverted to apple cider vinegar.Stornik 2016 Apple cider vinegar has been used commonly in food preparation and preservation, including in salad dressings, marinades, vinaigrettes, food preservatives, and chutneys. Vinegar has been sold commercially for more than 5,000 years. Use of the combination of apple cider vinegar and honey as an anti-infective remedy was documented in the Old Testament and by Hippocrates.Naziroglu 2014, Yagnik 2018 It was also used as a disinfectant for wounds during the American Civil War.Gopal 2017 Bioconversion of apple cider into vinegar is achieved by both natural and industrial processes; a key factor in bioconversion is the microbes used to convert the ethanol into acetic acid.Stornik 2016
Apple cider vinegar is produced from cider (the fermented apple juice) that has undergone bioconversion to vinegar following conversion of ethyl alcohol to acetic acid by microbes, usually Acetobacter.Yagnik 2018 In natural processes, the native microbes present on the fruit spontaneously carry out the process of converting the apple cider into vinegar. For vinegars, such as apple cider vinegar, that are less than 6% acetic acid, the predominant microbiota are Acetobacter aceti, Acetobacter pasteurianus, and/or Acetobacter pomorum. Studies show that microbiota diversity is higher in vinegars made from organic versus conventionally grown apples. The relatively low acidity (approximately 5% acetic acid) is mostly dependent on the sugar levels in the apples.Stornik 2016, Yagnik 2018 Organic acids, flavonoids, polyphenols, vitamins, and minerals are the main constituents.Yagnik 2018
Apple polyphenols are mainly polyphenolic acid derivatives and other flavonoids. Various maceration and production methods have been shown to significantly affect the chemical composition, total antioxidant activity, acidity, and phenolic content of apple cider vinegar. Chlorogenic acid is the dominant phenolic substance, with higher levels produced by maceration plus surface bioconversion methods compared to submersion methods. Gallic acid, catechin, epicatechin, caffeic acid, and p-coumaric acid are present in low levels.Budak 2011
Uses and Pharmacology
Experimental and in vitro data
An ex vivo study evaluated the antibacterial effects of irrigating solutions and their combinations on 110 single-rooted human teeth inoculated with Enterococcus faecalis. Irrigating solutions included sodium hypochlorite 2.5% solution alone; sodium hypochlorite 2.5% plus citric acid 10%; sodium hypochlorite 2.5% plus apple cider vinegar; apple cider vinegar alone; chlorhexidine 2%; or peracetic acid 1%. The combination of apple cider vinegar with sodium hypochlorite had similar efficacy to the other solutions and significantly reduced E. faecalis counts (P<0.05) immediately after a root canal extraction. After 7 days, however, bacterial growth was higher with the apple cider vinegar combination than with sodium hypochlorite alone. As monotherapy, apple cider vinegar irrigation solution resulted in similar E. faecalis counts at 7 days compared to baseline.Dornelles-Morgental 2011 Antimicrobial activity of apple cider vinegar has also been demonstrated in vitro against Escherichia coli, Staphylococcus aureus, Pseudomonas aeruginosa, and Bacillus subtilis at concentrations as low as 1%.Gopal 2017, Yagnik 2018
When studied as a food sanitizer with samples of lettuce, an apple cider vinegar 5% solution (0.3% acetic acid) provided a maximum mean reduction in E. coli counts of 2.7 log10 CFU/g of lettuce; only the white vinegar solution (35% solution with 1.9% acetic acid) provided higher mean reductions (5.4 log10 CFU/g of lettuce). The vehicle control of distilled water yielded a mean reduction in E. coli of 0.9 log10 CFU/g of lettuce. The mean reduction in aerobic plate counts for apple cider vinegar was 1.2 log10 CFU/g of lettuce compared to 0.6 log10 CFU/g of lettuce for the vehicle control, and 2.3 log10 CFU/g of lettuce for white vinegar. Compared to the other sanitizer solutions, consumer ratings for likeability consistently identified white vinegar as the least liked (P<0.05) for appearance, taste, texture, and overall acceptability; the apple cider vinegar 5% solution, lemon juice 13% solution, and distilled water were similar in terms of ratings and were consistently the most likeable.Vijayakumar 2002 Similarly, apple cider vinegar marinades for chicken breast fillets proved to be one of the most effective against indigenous total aerobes, including significant reductions in Pseudomonas species, Brocothrix thermosphacta, and Enterobacteriaceae (P<0.05).Lytou 2017
In vitro data
Antifungal activity of apple cider vinegar has been demonstrated in vitro against Candida albicans and Candida tropicalis.Mota 2015, Yagnik 2018 In one study, the minimum inhibitory concentration (MIC) for apple cider vinegar tablets at which no growth of C. albicans was visible was 250 mcg/mL, equivalent to a minimum dose required to restrict growth of undiluted apple cider vinegar (5% acidity).Yagnik 2018 Of 8 strains of C. albicans and C. tropicalis tested in another study, 2 strains showed a minimum fungicidal concentration (MFC) of 5,000 mcg/mL and 1 strain of C. tropicalis showed an MFC of 10,000 mcg/mL. At 4 times the MIC (equivalent to 10,000 mcg/mL), apple cider vinegar (4% malic acid) exhibited significantly improved inhibition of C. albicans growth on denture acrylic resin compared to the positive control nystatin (P<0.05).Mota 2015 Aspergillus niger and Saccharomyces cerevisiae are also susceptible to apple cider vinegar at concentrations ranging from 25% to 100%.Gopal 2017
A woman with a 5-year-history of recalcitrant chronic vaginal candidiasis was treated with a 4-month regimen of an apple cider vinegar douche applied vaginally twice daily. The dose was 20 mL of apple cider vinegar mixed with 1 L of water. The patient continued to be symptom free at the 24-month follow-up.Ozen 2017
Animal and in vitro data
Antioxidant activity has been demonstrated using various assay methods that indicate the free radical scavenging activity of apple cider vinegar is very high.Gopal 2017 Additionally, various vinegar production methods (ie, surface vs submersion) can significantly affect the total phenolic content and antioxidant activity of apple cider vinegars (P<0.05).Budak 2011 Animal data support these results. (Halima 2018, Naziroglu 2014) In rats, administration of apple cider vinegar for 6 and/or 9 weeks significantly improved the worsening of several liver and kidney antioxidant markers resulting from a high-fat diet (P<0.05 to P<0.001 vs high-fat diet alone and standard diet groups), specifically, malondialdehye, thiol group levels, superoxide dismutase, and catalase. Improvements in glutathione peroxidase (GSH-Px) activity were significant in the liver but insignificant in the kidney.Halima 2018 In a menopausal mouse model, significant improvements were observed in antioxidant biomarkers (ie, lipid peroxidation, GSH-Px, glutathione) as well as in antioxidant vitamin concentrations, including vitamins C and E and beta-carotene (P<0.05).Naziroglu 2014
Diabetes mellitus and glucose metabolism
Administration of apple cider vinegar (5% acetic acid) significantly improved, and often normalized, the increases in body weight, glucose, creatinine, liver enzymes, lipid parameters, and trace minerals that resulted from feeding normal rats a high-fat diet (P<0.01 to P<0.001 vs high-fat diet alone and standard diet groups).Halima 2018 Similarly, in a diabetic rat model, administration of apple cider vinegar significantly improved glycemic and lipid parameters. Although fasting blood glucose was not affected, reductions in glycosylated hemoglobin (HbA1c) (by 18.8%) and triglycerides (by 28.2%) were significant compared to controls (P<0.05).Shishehbor 2008 In contrast, rats fed a high-cholesterol diet plus apple cider vinegar exhibited significantly higher blood glucose levels compared to both normal controls and controls fed a high-cholesterol diet alone (P<0.05). Weight gain was also significantly increased in both controls and in rats fed apple cider vinegars produced using macerated apples, but not in those fed vinegars without macerated apples (P<0.05).Budak 2011
Limited clinical data are available and several factors affect the interpretation of study results, including the growing method of the apples (organic vs conventional), production method of the apple cider vinegar (natural, submersion, or surface), complexity of carbohydrates ingested with the test meal (complex vs monosaccharides), and the glycemic index of the test meal (high vs low).Budak 2011, Mitrou 2015, Stornik 2016 A systematic review and meta-analysis of 11 clinical studies (N=240) investigating vinegar consumption in patients with and without glucose metabolism disorders, including diabetes mellitus, documented an overall statistically significant reduction in glucose area under the curve (AUC) with vinegar compared to controls (standard mean difference, −0.6; 95% CI, −1.08 to −0.11; P=0.01). Similar results were found for insulin AUC (8 studies). Study sample sizes were small, ranging from 5 to 12 participants, and heterogeneity was significant. Subgroup analysis identified the type of vinegar (apple or white) and participant condition (with or without diabetes) to influence heterogeneity. It should be noted, that the authors erroneously stated only 2 of the 11 studies (instead of the actual 4) used apple cider vinegar. Therefore, conclusions cannot be drawn from the subgroup analysis.Shishehbor 2017
In a small, 2-week study in insulin-dependent diabetic patients (N=10) with diabetic gastroparesis, consumption of 30 mL/day of apple cider vinegar (5% acetic acid) every morning before breakfast significantly worsened delayed gastric emptying (P<0.05). Consumption of other vinegars during the study was not restricted.Hlebowicz 2007 In 11 newly diagnosed, treatment-naive patients with type 2 diabetes, consumption of a single 30 mL dose of apple cider vinegar (6% acetic acid) prior to a test meal significantly improved postprandial insulin secretion (P<0.046), blood glucose (P=0.028), and muscle glucose uptake (P=0.036) compared to placebo. Postprandial hypertriglyceridemia was also significantly decreased (P=0.044).Mitrou 2015
The effect of apple cider vinegar on glucose metabolism in nondiabetic subjects has also been explored.Panetta 2013, Salbe 2009 Recruitment was stopped early in one study (N=5) when early results showed that enteral glucose absorption was not suppressed by 20 mL of apple cider vinegar (5% acetic acid) given 2 minutes prior to a test meal.Salbe 2009 In a larger double-blind, randomized, placebo-controlled trial in nondiabetic subjects (N=114), no significant benefits of apple cider vinegar (30 mL/day) given for 2 months, with measurements collected at 8 and 16 weeks, were observed for HbA1c or high-sensitivity C-reactive protein levels.Panetta 2013
In vitro data
A significant dose-dependent decrease in mononuclear-derived tumor necrosis factor alpha and interleukin 6, markers of inflammation, were observed in vitro by monocytes cocultured with apple cider vinegar and either E. coli, S. aureus, or C. albicans. Phagocytic function of the monocytes was also significantly upregulated in the presence of apple cider vinegar when infected with the same microbes, as well as when compared to unstimulated monocytes. Additionally, a number of key enzymes and proteins required for cell division, glycolysis, immunogenicity, and other cell functions were not expressed. These included DNA proteins, 50S ribosomal proteins, chaperone protein Dnak, pyruvate kinase, and others.Yagnik 2018
Lipids and liver metabolism
Improvement in lipid parameters with apple cider vinegar has been noted in normal as well as diabetic and menopausal animal models.Budak 2011, Halima 2018, Naziroglu 2014, Shishehbor 2008 Administration of apple cider vinegar (5% acetic acid) significantly improved, and often normalized, the increases in lipid parameters that resulted from feeding normal rats a high-fat diet (P<0.01 to 0.001 vs high-fat diet alone and standard diet groups).Halima 2018 Similarly, in a diabetic rat model and a menopausal mouse model, administration of apple cider vinegar significantly improved various lipid parameters. Reductions in triglycerides, very low–density lipoprotein cholesterol (VLDL-C), and total cholesterol were significant in ovariectomized and nonovarectomized mice receiving apple cider vinegar compared to controls (P<0.001),Niziroglu 2014 and high-density lipoprotein cholesterol (HDL-C) was significantly increased in diabetic rats (18%; P<0.05) compared to baseline.Shishehbor 2008 In the diabetic rat study, significant changes were also observed in normal rats, with a 47% reduction in low-density lipoprotein cholesterol (LDL-C) and a 34% increase in HDL (P<0.005 each).Shishehbor 2008 Another study conducted in rats fed a high-cholesterol diet found that various vinegar production methods affected lipid metabolism differently. Only the vinegar prepared by the surface method without macerated apples significantly improved all lipid parameters (ie, triglycerides, VLDL, total cholesterol, HDL, LDL) (P<0.05). Apple cider vinegar produced by either the surface or submersion method led to significant improvements in liver function tests, while steatosis was improved only by vinegars produced by the submersion method without macerated apples (P<0.05). However, increases in liver enzymes (ie, AST, ALT, alkaline phosphatase [ALP]) caused by the high-cholesterol diet were decreased significantly by all production methods compared to high-cholesterol–fed control animals not receiving apple cider vinegar (P<0.05).Budak 2011
In one double-blind, randomized, placebo-controlled trial of nondiabetic subjects (N=114), apple cider vinegar (30 mL/day) given for 2 months did not result in significant benefits in total cholesterol, HDL, LDL, triglycerides, or high-sensitivity C-reactive protein when measured at 8 and 16 weeks. Mean age of participants was 56.7 years, 65% were female, and approximately 30% were taking concomitant statins, fish oil, and/or aspirin for cardiac conditions.Panetta 2013 In 11 newly diagnosed, treatment-naive patients with type 2 diabetes, consumption of a single 30 mL dose of apple cider vinegar (6% acetic acid) prior to a test meal significantly decreased postprandial hypertriglyceridemia (P=0.044 vs placebo).Mitrou 2015
Dosing is not well established.
In a product sampling of 7 brands of apple cider vinegar tablets, extreme variability was found that contributed to significant misbranding. Readings for pH varied from 2.9 to 5.7, acetic acid content ranged from 1.04% to 10.57% and citric acid content ranged from 0.24% to 18.5%; malic acid content was 49.12% in one product. Dosing recommendations on the labels varied 10-fold, ranging from 300 mg/day to 3,000 mg/day. Two products each labeled as consisting of 35% acetic acid, the marker for the presence of apple cider vinegar, were found to contain only 2% and 3.2% acetic acid. Had these 2 products actually contained the amounts of acetic acid claimed on the labels, they would have resulted in poisoning (defined as acetic acid concentration of 20% or more). Additionally, 3 of the products were contaminated with yeast and mold, one of which was labeled as "yeast-free."Hill 2005 One commercially available apple cider vinegar product for weight loss was found by the FDA to be tainted with sibutramine.FDA 2018
Pregnancy / Lactation
Multiple reports of chemical burns with apple cider vinegar have been documented.Hill 2005 Cases of dermal chemical burns, particularly with the use of occlusive dressings, have also been reported.Ashchyan 2018, Bunick 2012, Feldstein 2017 In an 8-year-old boy with multiple mollusca contagiosa lesions on the leg, a home remedy consisting of cotton balls soaked in apple cider vinegar (approximately 5% acetic acid) was applied and secured in place with adhesive bandages overnight for a duration of approximately 8 hours. Violet discolored macules and patches were observed the next morning, accompanied by a low-grade fever and tenderness of the leg. The area with the greatest occlusive dressing exhibited the most prominent lesion. Abrupt epidermal necrosis was observed microscopically. The chemical burns healed without intervention; however, the mollusca did not resolve and required topical drug therapy.Bunick 2012 An 11-year-old girl used this occluded apple cider vinegar-cotton ball method on a melanocytic nevus after watching a tutorial video online. When the girl’s mother noticed the bandage 3 days later, she removed it and a few weeks later sought medical treatment for her daughter when the nevus repigmented. Microscopically, scar formation was observed that extended into the mid-dermis.Ashchyan 2018 Similarly, a 14-year-old female self-treated her unwanted moles (nevi) on her nose with a "natural remedy" she found on the internet. For 3 days, she applied several drops of apple cider vinegar to the moles and occluded the area with a bandage. She experienced significant redness and irritation at the application site as well as resolution of her moles. The noninflammatory and poorly defined erosions that remained were treated medically for several weeks.Feldstein 2017 Upon oral administration, esophageal tissue injury, tenderness of the larynx, and pain during swallowing were reported by a 48-year-old woman after an apple cider vinegar tablet had been lodged in her throat for approximately 30 minutes. Subsequent product testing revealed significant misbranding of this and other apple cider vinegar tablets sampled. In particular, the acetic acid content of the particular product used was more than twice per tablet that found in apple cider vinegar (mean, 10.57%).Hill 2005
Data are lacking; apple cider vinegar is considered GRAS when used as food. Unexplained hypokalemia and drastically reduced bone mineral density in a 28-year-old woman revealed that consumption of long-term, high doses of apple cider vinegar was the likely cause of her osteoporosis. She presented with muscle cramps, hypokalemia, potassium wasting, high sodium excretion, and resulting stimulation of plasma renin activity. She admitted a 6-year history of 250 mL/day of apple cider vinegar diluted in water. Laboratory results suggested a complex effect of acetic acid ingestion on bone metabolism.Lhotta 1998
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