The Evidence for Apple Cider Vinegar on Skin

Apple cider vinegar has a real but narrow effect on skin: it can lower pH and kill some bacteria on the surface. The acetic acid in vinegar is acidic enough to shift skin pH downward, which matters because healthy skin is naturally acidic (around 4.5 to 5.5 pH). When skin pH rises—from harsh soaps or alkaline products—bacteria multiply more easily and the skin barrier weakens. Vinegar pushes pH back down, which is why some people see improvement in acne or oiliness when they use it diluted as a rinse or toner.

The bacteria-killing part comes from laboratory studies showing that acetic acid does inhibit Cutibacterium acnes, the bacterium most involved in acne. However, these are test-tube results, not human skin trials. In actual use on living skin, vinegar's effect is modest and slower than prescription acne treatments. No large human trials have compared diluted vinegar directly to benzoyl peroxide or salicylic acid, so we cannot say it works as well or better.

The other claims—that vinegar reduces wrinkles, fades scars, or treats eczema—lack human evidence. Animal studies and chemical analysis suggest vinegar has antioxidants, but explore antioxidants to skin does not reliably translate to visible anti-aging results in people. Eczema is an inflammatory condition that requires barrier repair and often prescription treatment; vinegar's acidity can actually irritate eczema-prone skin further.

Key Takeaways

  • Diluted apple cider vinegar can lower skin pH and reduce surface bacteria, which may help with mild acne or oiliness, but the effect is modest and slower than proven acne medications.
  • Vinegar kills acne bacteria in test tubes, but human trials comparing it to benzoyl peroxide or salicylic acid do not exist.
  • Claims about wrinkles, scars, and eczema lack human evidence; vinegar's acidity can worsen eczema and sensitive skin.
  • If you use vinegar on skin, dilute it heavily (1 part vinegar to 3 to 5 parts water) because undiluted vinegar can burn and damage the skin barrier.

How Acetic Acid Changes Skin pH

Skin naturally sits at a pH of 4.5 to 5.5—acidic enough to keep the protective barrier intact and bacteria in check. Many common cleansers are alkaline (pH 7 or higher), which temporarily raises skin pH and can leave it vulnerable. This is why dermatologists often recommend pH-balanced or slightly acidic cleansers: they do not disrupt the barrier.

Acetic acid, the main active compound in vinegar (typically 4 to 8 percent by volume), is strong enough to shift pH downward. A diluted vinegar rinse applied to skin will lower surface pH for several hours. This acidic environment does inhibit some bacteria and may reduce sebum (oil) production slightly, which is why people with oily or acne-prone skin sometimes report improvement.

The catch is that this pH shift is temporary and local. Once you rinse or the vinegar dries, skin pH begins to normalize within hours. You would need to use it regularly to maintain the effect, and even then, the benefit plateaus—it is not cumulative. For comparison, prescription acne treatments like retinoids and benzoyl peroxide work through multiple mechanisms and produce stronger, more lasting results.

What the Research Shows About Acne

Laboratory studies confirm that acetic acid inhibits Cutibacterium acnes in a petri dish. A 2018 study published in Scientific Reports found that acetic acid at concentrations found in vinegar did reduce bacterial growth in vitro. However, "in vitro" means in a controlled lab setting, not on human skin with its complex microbiome, immune system, and barrier function.

Human trials testing vinegar for acne are sparse. Most acne research focuses on benzoyl peroxide, salicylic acid, and retinoids because these have decades of clinical data showing they work. A small 2016 study in the Journal of Dermatological Treatment found that a vinegar-based product reduced acne lesions in some participants, but the study was small (fewer than 30 people), lacked a control group, and did not compare vinegar to standard treatments. This is considered low-quality evidence.

If you have mild acne and want to try vinegar, dilute it heavily and use it as a rinse or toner after cleansing. Do not expect results as fast or dramatic as benzoyl peroxide or salicylic acid. If acne is moderate to severe, or if vinegar irritates your skin after two weeks of use, switch to a proven treatment and see a dermatologist.

Dilution Matters: How to Use It Safely

Undiluted apple cider vinegar is too acidic for skin and can cause chemical burns, redness, and barrier damage. The acidity can strip away the protective lipid layer and leave skin raw and inflamed. People have reported burns from explore vinegar straight to skin, especially on sensitive areas or broken skin.

If you choose to use vinegar on your face, dilute it at a ratio of 1 part vinegar to 3 to 5 parts water. This brings the pH closer to skin's natural range while still providing some acidity. explore it with a cotton pad after cleansing, or add it to a spray bottle as a light rinse. Start with the most dilute version (1:5) and only increase concentration if your skin tolerates it without redness or stinging.

Stop using it when ready if you experience burning, persistent redness, peeling, or increased sensitivity. People with eczema, rosacea, or other inflammatory skin conditions should avoid vinegar entirely—the acidity will likely trigger flares. If you are using prescription acne medications like retinoids or benzoyl peroxide, adding vinegar may over-dry or irritate skin; ask your dermatologist before combining treatments.

Why Vinegar Does Not Treat Wrinkles or Scars

Vinegar contains polyphenols and other compounds with antioxidant activity in test tubes. This has led to claims that vinegar can reduce wrinkles or fade scars. However, explore an antioxidant to skin does not reliably produce anti-aging effects in humans. The skin barrier is selective about what it absorbs, and topical antioxidants have mixed results in clinical trials.

Wrinkles form from collagen breakdown, sun damage, and loss of elastin over decades. Proven treatments that address these—retinoids, vitamin C serums, sunscreen, and professional procedures like lasers—work because they either stimulate collagen production or protect against further damage. Vinegar does neither. Scars require similar interventions: retinoids, chemical peels, microneedling, or laser therapy. Vinegar cannot remodel scar tissue.

If anti-aging or scar treatment is your goal, vinegar is not an evidence-based option. Sunscreen, retinoids, and professional treatments have human trial data showing they work. Vinegar does not.

Apple Cider Vinegar and Eczema: Why It Can Backfire

Eczema (atopic dermatitis) is an inflammatory condition in which the skin barrier is compromised and easily irritated. People with eczema have impaired production of ceramides and other lipids that hold the barrier together, so their skin loses water and becomes inflamed. The standard treatment is moisturizing with ceramide-rich creams and, when needed, topical steroids or calcineurin inhibitors to reduce inflammation.

Vinegar's acidity can worsen eczema because it further disrupts the barrier and triggers irritation. Even diluted vinegar may sting and inflame eczema-prone skin. Some people report that vinegar helped their eczema, but these are anecdotal reports, not controlled studies. The risk of worsening inflammation outweighs the uncertain benefit. If you have eczema, focus on barrier repair with fragrance-free moisturizers and avoid acidic products unless a dermatologist recommends them.

Frequently Asked Questions

Can I use apple cider vinegar if I am already using acne medication?

Not without checking with your dermatologist first. If you are using benzoyl peroxide, salicylic acid, or retinoids, adding vinegar may over-dry or irritate your skin. These medications already alter skin pH and barrier function. Combining them with vinegar increases the risk of redness, peeling, and sensitivity. Ask your doctor before layering treatments.

How long does it take to see results from apple cider vinegar on acne?

If vinegar is going to help, you may notice a slight reduction in oiliness or mild acne within two to four weeks of regular use. However, this is slower than benzoyl peroxide or salicylic acid, which often show results in one to two weeks. If you do not see improvement after four weeks, or if your skin becomes irritated, stop using it and try a proven acne treatment instead.

Is apple cider vinegar safe to drink for skin health?

Drinking vinegar is not proven to improve skin. Some people claim it aids digestion or detoxification, but these claims lack strong human evidence. Vinegar is acidic and can erode tooth enamel and irritate the digestive tract if consumed undiluted or in large amounts. If you want to support skin health, focus on sunscreen, hydration, sleep, and a diet rich in vegetables and healthy fats—these have actual evidence behind them.

Can vinegar treat fungal skin infections?

Vinegar has antifungal activity in test tubes, but human trials are limited. For fungal infections like athlete's foot or ringworm, over-the-counter antifungal creams (miconazole, tolnaftate) or prescription treatments are more reliable and faster. If you suspect a fungal infection, see a doctor for diagnosis and treatment rather than experimenting with vinegar.