Fermented Foods for Healthy Skin

Nutrition

Oct 2

Written By Tateki Matsuda

Summary & Key Takeaways

Fermented foods are a natural way to support healthy skin—probiotics, vitamins, and lactic acid (an AHA that exfoliates and hydrates).
Research: kefir improved skin hydration and barrier function, including in atopic dermatitis; fermented barley and soy enhance hydration.
β-glucans in fermented barley boost collagen and elasticity and reduce wrinkling; a 12-week study found koji extract improved wrinkles and dryness.
Gut health is tied to skin health—miso, natto, koji, kimchi, sauerkraut, yogurt, and kefir all help from the inside out.

Healthy Skin

Looking for a natural way to healthier skin? Consider adding fermented foods to your diet. Skin health is one of the most visible signs of overall health. Plenty of commercial products promise youthful, radiant skin, but they're often expensive and full of harsh chemicals. Fermented foods are a more natural route: they're packed with beneficial bacteria that improve your skin's overall health, and they're low in sugar and calories—good for anyone managing weight or blood sugar.

*(a) Schematic diagram of skin structure, (b) Schematic diagram of skin structure after aging. This picture is a comparison of the changes between young skin and aging skin. Ref:* *https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7146365/*

The benefits of fermented foods for skin health

People have known about fermented foods and skin for centuries. They contain probiotics—beneficial bacteria that keep skin healthy and help prevent acne by fighting off harmful bacteria and yeast. They're also high in the vitamins and minerals skin needs, and fermentation breaks food into smaller particles the body absorbs easily, so nutrients reach the skin more readily. Fermented food is also loaded with lactic acid, an alpha hydroxy acid (AHA) with well-documented skin benefits: it works as a natural exfoliant, dissolving the bonds between dead skin cells to reveal newer, brighter skin, and it hydrates—helping with dryness, fine lines, and wrinkles.

What research says

Kefir is a fermented milk food known for gut health, but it helps skin too. A recent study showed kefir intake significantly improved all skin outcomes, including hydration. Its nutritional and microbial richness makes it highly relevant for anyone seeking better skin.

A study published in Multidisciplinary Digital Publishing Institute found kefir may help skin conditions, especially atopic dermatitis. Two groups of volunteers—one healthy, one with atopic dermatitis—consumed kefir for eight weeks. Kefir boosted barrier function in both skin types and improved the severity of atopic disease in the kefir group. The probiotics help balance the bacteria on your skin, the antioxidants protect it from damage, and kefir's vitamins and minerals are essential for healthy skin.

Another study, published in the Journal of Clinical Biochemistry and Nutrition, shows fermented barley and soybean formula enhances skin hydration. Isoflavone, a biologically active soybean compound, can improve skin through antioxidant activity, anti-inflammatory activity, collagen synthesis, and protection from UV radiation—effects thought to come from its ability to modulate key skin-health signaling molecules. Barley, a whole grain often used in brewing, also benefits skin: it contains vitamin C (essential for collagen production) and selenium (antioxidant protection).

β-glucans, found in fermented barley, improve skin elasticity and reduce inflammation. They decrease hyaluronidase and collagenase expression, stimulate collagen protein expression, and reduce wrinkling in vivo and in human subjects. β-glucans also keep skin hydrated by trapping moisture, making barley an effective natural treatment for dry skin, eczema, and other conditions—and they stimulate the immune system, another reason barley is a strong all-natural choice for skin health.

Koji extract is a traditional Japanese ingredient used in fermented foods for centuries, and recent research shows benefits for skin and hair. A 12-week study in the Journal of Cosmetic Dermatology tested koji extract on healthy females aged 30-49. Participants took a koji-extract supplement or placebo for 12 weeks. Koji extract significantly improved skin conditions, including wrinkles and dryness—suggesting it may be an effective ingredient for anti-aging cosmetics.

The different types of fermented foods and their benefits

Fermented food has been part of the human diet for thousands of years. It's rich in probiotics—live microorganisms that improve gut health, boost immunity, and reduce inflammation. There are many kinds, each with its own flavor and benefits: yogurt is a fermented dairy rich in calcium and protein; sauerkraut is fermented cabbage high in vitamins C and K; kimchi is a fermented vegetable dish rich in antioxidants; kefir is a fermented milk drink high in calcium and vitamin D. Delicious and nutritious ways to improve your overall health.

How to add fermented foods to your diet for better skin health

A growing body of evidence links gut health to skin health. Fermented foods are central to a healthy gut, and they help the skin too. Their probiotics promote a healthy gut and help fight inflammation—a major cause of acne and eczema. Adding them to your diet is a simple way to improve skin from the inside out. Great options: miso, natto, koji, kimchi, sauerkraut, yogurt, and kefir. Work these into your routine for clearer, more radiant skin.

References:

Cao C, Xiao Z, Wu Y, Ge C. Diet and Skin Aging-From the Perspective of Food Nutrition. Nutrients. 2020 Mar 24;12(3):870. doi: 10.3390/nu12030870. PMID: 32213934; PMCID: PMC7146365.

Alves E, Gregório J, Baby AR, Rijo P, Rodrigues LM, Rosado C. Homemade Kefir Consumption Improves Skin Condition-A Study Conducted in Healthy and Atopic Volunteers. Foods. 2021 Nov 13;10(11):2794. doi: 10.3390/foods10112794. PMID: 34829075; PMCID: PMC8622502.

FAQ

How do fermented foods help skin?

Probiotics fight acne-causing bacteria and balance skin flora, while lactic acid (an AHA) exfoliates and hydrates, and the vitamins and minerals reach the skin more easily after fermentation.

What does the research show?

Kefir improved skin hydration and barrier function (including atopic dermatitis); fermented barley and soy enhanced hydration via isoflavone and β-glucans; and a 12-week study found koji extract improved wrinkles and dryness.

Which fermented foods should I add for skin?

Miso, natto, koji, kimchi, sauerkraut, yogurt, and kefir.

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