7 Side Effects of Too Much Apple Cider Vinegar

Apple cider vinegar is widely recognized for its potential health perks, yet it’s possible to overdo it. Monitoring how much you consume is essential, as excessive intake may lead to unwanted effects such as delayed stomach emptying, nausea, or erosion of tooth enamel.

As a traditional natural remedy, apple cider vinegar has been used for years as a wellness tonic. Several human studies support certain benefits. Still, questions often arise — including concerns like Can apple cider vinegar cause nerve damage — along with broader worries about safety and adverse reactions.

Below, we explore apple cider vinegar’s possible side effects, clarify misconceptions about nerve health, and outline how to use it safely and responsibly.

What is apple cider vinegar?

Apple cider vinegar is produced by fermenting apples with yeast.

During this process, yeast transforms the natural sugars in apples into alcohol. Bacteria are then introduced, converting the alcohol into acetic acid (1).

Acetic acid accounts for roughly 5–6% of apple cider vinegar. Although categorized as a “weak acid,” it still exhibits strong acidic characteristics in concentrated form.

Beyond acetic acid, vinegar contains water along with trace quantities of other acids, vitamins, and minerals (1).

Multiple animal and human studies suggest that acetic acid and apple cider vinegar may encourage fat burning and weight reduction, help lower blood sugar levels, enhance insulin sensitivity, and improve cholesterol markers (2, 3, 4, 5).

That said, high-quality human research supporting daily long-term use remains limited, and further investigation is necessary (6).

SummaryApple cider vinegar is produced through fermentation and contains acetic acid, which may contribute to weight loss and metabolic benefits such as improved blood sugar control and healthier cholesterol levels.

What are the negative effects of apple cider vinegar?

Although many people tolerate apple cider vinegar well in modest amounts, it has been associated with several side effects — particularly when taken in high doses or over extended periods.

For individuals wondering, Can apple cider vinegar cause nerve damage? there is currently no strong scientific evidence showing that moderate, diluted intake directly damages nerves. However, indirect complications — such as severe electrolyte imbalances from excessive use — could theoretically affect overall nerve function. Most risks are tied to overconsumption rather than typical dietary use.

1. Delayed stomach emptying

Small studies in humans indicate that apple cider vinegar may slow the rate at which food exits the stomach and enters the small intestine. This delayed gastric emptying can reduce how quickly nutrients are absorbed into the bloodstream.

However, this effect may aggravate symptoms of gastroparesis, a condition frequently seen in people with diabetes.

In gastroparesis, stomach nerves function improperly, causing food to remain in the stomach longer than normal.

Common symptoms include bloating, heartburn, and nausea. For individuals managing type 1 diabetes alongside gastroparesis, coordinating insulin with meals becomes difficult because digestion timing is unpredictable.

One controlled study involving 10 patients with type 1 diabetes and gastroparesis found that consuming water mixed with 2 tablespoons (30 mL) of apple cider vinegar significantly prolonged stomach emptying compared to plain water (7).

Additional research is needed to clarify how apple cider vinegar influences gastric motility and blood sugar management.

SummaryApple cider vinegar may delay stomach emptying, potentially worsening gastroparesis symptoms and complicating blood sugar control in people with type 1 diabetes.

2. Digestive side effects

Some individuals experience uncomfortable digestive symptoms after consuming apple cider vinegar.

Short-term studies suggest acetic acid may reduce appetite, though more research is required to determine long-term effects (8, 9).

In one controlled trial, participants who drank a beverage containing 25 grams (0.88 ounces) of apple cider vinegar reported lower appetite but significantly higher levels of nausea — especially when the drink had an unpleasant taste (10).

This may explain why some people discontinue use due to stomach discomfort, acid reflux, or queasiness.

SummaryWhile apple cider vinegar may temporarily suppress appetite, it can also trigger nausea or digestive discomfort in certain individuals.

3. Low potassium levels and bone loss

Currently, no controlled trials directly evaluate apple cider vinegar’s impact on blood potassium levels or bone density.

However, a published case report linked prolonged high-dose intake to low potassium and bone loss.

A 28-year-old woman consumed 8 ounces (1 cup) of diluted apple cider vinegar daily for 6 years.

She was hospitalized with low potassium levels and additional blood chemistry abnormalities (11).

She was also diagnosed with osteoporosis, a disorder characterized by fragile bones that is uncommon in young adults.

Physicians suggested that large daily amounts of apple cider vinegar may have caused minerals to leach from her bones to neutralize blood acidity. Elevated acid levels can also impair new bone formation.

It’s important to emphasize that this case involved unusually high daily intake over many years.

SummaryA case report suggests excessive long-term consumption of apple cider vinegar may contribute to low potassium levels and osteoporosis.

4. Erosion of tooth enamel

Acidic foods and drinks are known to damage tooth enamel (12).

Although soft drinks and fruit juices are more commonly studied, evidence indicates that acetic acid in vinegar may also erode enamel.

In a laboratory experiment, wisdom tooth enamel exposed to vinegars with pH levels between 2.7 and 3.95 lost 1–20% of its mineral content after 4 hours (13).

While this lab setting doesn’t reflect real-life use, consistent exposure to undiluted vinegar could still contribute to dental erosion.

One case study described severe dental decay in a 15-year-old girl who consumed 1 cup (237 mL) of undiluted apple cider vinegar daily for weight loss (14).

SummaryThe acetic acid in vinegar may weaken enamel, increasing the risk of mineral loss and tooth decay.

5. Throat burns

Apple cider vinegar can cause esophageal (throat) burns if swallowed improperly.

A review of accidental ingestions in children found acetic acid from vinegar was the most common cause of acid-related throat burns.

Researchers advised that vinegar should be treated as a “potent caustic substance” and stored safely (15).

There are also documented cases of adults requiring medical care after prolonged consumption of large volumes of vinegar beverages (16).

SummaryAcetic acid in apple cider vinegar has been linked to throat burns in both children and adults when consumed in excessive or undiluted amounts.

6. Skin burns

Because of its strong acidity, apple cider vinegar may cause chemical burns when applied directly to the skin.

In one case, a 14-year-old girl developed skin erosions after placing drops of apple cider vinegar on moles (17).

Another report described leg burns in an 8-year-old boy after vinegar was used to treat an infection (18).

Numerous anecdotal accounts online also describe burns from topical application.

SummaryDirect skin application of apple cider vinegar has resulted in chemical burns in some reported cases.

7. Drug interactions

Apple cider vinegar may interact with certain medications:

• Diabetes medication. Individuals taking insulin or insulin-stimulating drugs may experience dangerously low blood sugar or potassium levels when combining these medications with vinegar.
• Digoxin (Lanoxin). This drug lowers blood potassium levels. Using it alongside apple cider vinegar may cause potassium to drop excessively.
• Certain diuretic drugs. Some diuretics increase potassium excretion. Taking them with large amounts of vinegar could worsen potassium depletion.

SummaryApple cider vinegar may interact with insulin, digoxin, and certain diuretic medications.

How to consume apple cider vinegar safely

For most people, moderate intake is generally safe when proper precautions are followed. If you’re considering using it for nerve-related symptoms, it’s wise to review evidence-based guidance such as Does apple cider vinegar help nerve damage and practical tips on How to take apple cider vinegar for nerve pain before starting.

• Limit your intake. Begin with a small amount and gradually increase up to 2 tablespoons (30 mL) daily, diluted in water, depending on tolerance.
• Reduce tooth exposure. Dilute vinegar well and consider drinking it through a straw.
• Rinse your mouth. Rinse with water afterward and wait at least 30 minutes before brushing your teeth.
• Avoid if you have gastroparesis. Either avoid it or restrict intake to 1 teaspoon (5 mL) diluted in water or used in salad dressing.
• Watch for allergies. Though uncommon, discontinue use and consult a doctor if you experience an allergic reaction.

SummaryTo use apple cider vinegar safely, keep doses moderate, dilute it properly, and avoid use if you have certain medical conditions.

The bottom line

Apple cider vinegar may offer several potential health benefits, particularly for metabolic health.

However, concerns such as Can apple cider vinegar cause nerve damage typically stem from misunderstandings or extreme overuse. There is no strong evidence that moderate, diluted consumption directly harms nerves, but excessive intake can lead to complications that indirectly affect overall health.

Using apple cider vinegar responsibly — in appropriate amounts and with medical guidance when needed — helps minimize risk.

While small quantities may be beneficial for some individuals, more is not better and can sometimes be harmful.