Hair Loss: Have You Also Checked Your Gut Health?

“When I’m stressed, my hair loss seems to get worse.”

This is something I often hear in the clinic.

When I talk with patients, quite a few of them also say they frequently have digestive discomfort or repeat bouts of constipation or diarrhea.

But gut health and hair loss are not simply unrelated.

Recent studies, through the concept of the “Gut-Brain-Skin Axis,” emphasize the connection of gut health → mental health → skin and hair health.

What is the Gut-Brain-Skin Axis?

In short, the gut is a communication network that interacts with the brain and the skin, including the scalp, and influences one another.

Trillions of microorganisms live in our intestines, and they do more than simply help with digestion; they also affect immune regulation, neurotransmitter production, and systemic inflammation control.

As a result, if the gut is not healthy, you can become more vulnerable to stress, and hair health may also worsen.

How are the gut and hair loss connected?

The main mechanisms by which the gut-brain-skin axis affects hair loss are as follows.

1. Gut microbiome imbalance → causes systemic inflammation

• If the intestinal barrier weakens and endotoxins (LPS) enter the bloodstream, immune hyperreactivity and microinflammation around hair follicles can occur, inducing hair loss.

• The anagen phase is shortened and telogen effluvium increases.

2. Overactivation of the stress axis (HPA axis)

• When beneficial gut bacteria decrease, serotonin production declines and the ability to regulate mood deteriorates.

• The stress hormone cortisol remains persistently elevated, leading to inhibition of hair follicle growth and instability in the hair growth cycle.

3. Decreased metabolic function of hair follicles

• Gut microbiota produce B vitamins and bioactive substances, contributing to nutrient supply for hair follicles.

• When gut health is poor, these indirect nutrient-supplying pathways weaken, which is unfavorable for hair growth.

Real research examples

Case 1: Gao et al. (2023)

In participants who took probiotics, reduced scalp inflammation, restored sebum balance, and improved hair condition were observed.

Case 2: Yu et al. (2022)

After taking a combined lactic acid bacteria formulation for 12 weeks, reductions in scalp oiliness, relief of itching, and improved mood scores were observed, along with improvements in mental health and skin condition.

As shown above, research findings showing that hair loss improved after gut health was restored are steadily increasing.

Practical tips for gut health to help prevent hair loss

Practice	Expected effect
Take probiotics	Supply beneficial bacteria, suppress inflammation
Eat a diet rich in dietary fiber	Provide prebiotics, maintain gut balance
Reduce refined sugar/processed foods	Suppress the growth of harmful gut bacteria
Meditation, exercise, adequate sleep	Relieve stress, improve the gut environment

Hair loss: Have you also checked your gut health?

Conclusion

When hair loss occurs, people often rely only on scalp products or medication,

but looking at the condition of the gut inside the body can also be an important treatment direction.

When the gut is comfortable, the brain is comfortable too, and hair falls out less.

Now is the time to accept not only external care but also internal gut health management as an essential strategy in hair loss treatment.

It’s time for hairgrowth, Kim Jino.

Filsaengsinmo (必生新毛).

References

• Gao, T., Wang, X., Li, Y., & Ren, F. (2023). The role of probiotics in skin health and related gut-skin axis: A review. Nutrients, 15(14), 3123. https://doi.org/10.3390/nu15143123

• Yu, P., Teng, X., Liu, T., Li, Y., Ni, J., Xue, S., & Wang, J. (2022). Effect of an oral probiotic formula on scalp and facial skin condition, glucose, and lipid metabolism. Functional Foods in Health and Disease, 12(7), 394–409. https://doi.org/10.31989/ffhd.v12i7.944

• Bowe, W.P., & Logan, A.C. (2011). Acne vulgaris, probiotics and the gut-brain-skin axis—back to the future? Gut Pathogens, 3(1), 1. https://doi.org/10.1186/1757-4749-3-1

[In accordance with Article 56, Paragraph 1 of the Medical Service Act, this post is written directly by a board-certified plastic surgeon for informational purposes. Hair loss surgery and treatment may have side effects, and they should be decided carefully through consultation with a specialist.]