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The Gut-Skin Axis Explained

How your gut and your skin talk to each other.

Quick answer

The gut-skin axis is the two-way connection between the bacteria in your digestive tract and the health of your skin. Your gut microbiome, trillions of bacteria, helps train the immune system, influences inflammation and helps produce compounds that reach the rest of the body. When the gut is balanced, it supports calm, healthy-looking skin; when it is out of balance, research has linked it with skin concerns such as redness, breakouts and dryness, as well as bloating and irregular digestion. Habits that support both include eating a variety of fiber-rich plants, adding fermented foods, considering a probiotic and prebiotic, drinking enough water, sleeping well, managing stress, protecting skin from the sun and limiting ultra-processed foods and alcohol.

Key takeaways

For years, skin care focused on what we put on our skin. Today, researchers are paying more attention to what happens inside, especially in the gut.

What is the gut-skin axis?

The gut and skin have a lot in common. Both are barriers between your body and the outside world, both are home to large communities of microbes, and both are closely linked with the immune system. The gut-skin axis describes the way these systems communicate.

How the gut influences the skin

Gut factorPossible effect on skin
Balanced microbiomeSupports calm, healthy-looking skin
Imbalance (dysbiosis)Linked with redness, breakouts, dryness
Short-chain fatty acids from fiberSupport a healthy gut lining and immune balance
Gut barrier healthHelps keep inflammation in check

Signs your gut and skin may be out of balance

These can have many causes. See a doctor or dermatologist for persistent symptoms.

What research suggests

Studies have linked differences in gut bacteria with several skin concerns, and some research has explored probiotics and prebiotics for skin hydration and appearance. The science is still growing, but the connection is a promising area of research.

10 habits for a healthy gut and skin

  1. Eat 30 different plant foods a week for fiber variety
  2. Add fermented foods such as yogurt, kefir or kimchi
  3. Consider a probiotic and prebiotic
  4. Drink enough water
  5. Sleep 7–9 hours
  6. Manage stress with movement, breathing or time outdoors
  7. Limit ultra-processed foods and added sugar
  8. Go easy on alcohol
  9. Use sunscreen daily
  10. Be gentle with your skin; avoid over-scrubbing

Where PrimeBiome fits

PrimeBiome combines the probiotic B. coagulans, the prebiotic inulin and 8 botanicals in one daily gummy to support beneficial bacteria, digestion and the skin's natural cell turnover.

Important: supplements don't treat acne, eczema, psoriasis or rosacea. See a dermatologist for skin conditions, and ask your doctor before starting a probiotic if you have a weakened immune system.

Sources

  1. Salem I, et al. "The gut microbiome as a major regulator of the gut-skin axis." Frontiers in Microbiology, 2018.
  2. De Pessemier B, et al. "Gut-skin axis: current knowledge of the interrelationship between microbial dysbiosis and skin conditions." Microorganisms, 2021.
  3. NIH National Center for Complementary and Integrative Health – "Probiotics: what you need to know."

Common questions

What is the gut-skin axis?

The two-way connection between gut bacteria and skin health.

Can gut health affect skin?

Research has linked gut balance with how skin looks and feels.

Can probiotics help skin?

Research is growing; probiotics may support the gut-skin connection.

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