I know what you’re thinking: “My hairstylist is about to tell me about gut health.” And yes, I am. Because after watching thousands of clients over two decades, the ones with persistent, unexplained hair problems almost always have something going on internally. And the gut keeps coming up.
The connection isn’t as weird as it sounds
Your gut is where nutrients get absorbed. If your gut isn’t functioning well, it doesn’t matter how many vitamins you take or how clean your diet is — the nutrients aren’t getting where they need to go. Including your hair follicles.
Gut inflammation can also trigger systemic inflammation, which affects hair follicles. Conditions like celiac disease, Crohn’s, IBS, and even low-grade dysbiosis (imbalanced gut bacteria) have all been linked to hair thinning in research.
What I see in the chair
Clients with chronic digestive issues often have hair that’s thinner, drier, and more brittle than their age and care routine would suggest. The hair isn’t getting what it needs because the body can’t properly absorb what it’s given.
I’ve had clients whose hair improved dramatically after getting gut issues diagnosed and treated — not because they changed their hair products, but because their body finally started absorbing nutrients properly.
Nutrient absorption is the key
Your hair needs iron, zinc, vitamin D, biotin, protein, and omega-3s to grow properly. All of these depend on healthy gut function for absorption. Iron absorption happens in the duodenum. Zinc absorption requires proper stomach acid. Vitamin D absorption requires healthy intestinal lining.
If any part of that system is compromised, your hair is one of the first places it shows — because your body deprioritizes hair when resources are scarce.
Signs your gut might be the issue
Hair thinning combined with digestive symptoms: bloating, irregular digestion, food sensitivities, frequent stomach discomfort. If you’re experiencing both, there might be a common cause.
Hair that doesn’t respond to topical treatments the way it should. If you’re using good products, getting regular treatments, and your hair still isn’t improving — the problem might not be on the outside.
What to do about it
This is firmly doctor territory. A gastroenterologist can run tests for celiac disease, inflammatory bowel conditions, SIBO (small intestinal bacterial overgrowth), and food sensitivities. Comprehensive stool testing can reveal imbalances in your microbiome.
From a general health standpoint: eat a diverse, fiber-rich diet. Fermented foods (yogurt, kimchi, sauerkraut) support beneficial gut bacteria. Minimize processed food and unnecessary antibiotics. Stay hydrated.
What I can do
I can notice when something doesn’t add up. When a client’s hair quality doesn’t match their care routine, I ask questions. Not because I can diagnose anything — I can’t — but because sometimes the right question points someone toward the right doctor.
And while you’re working on the internal stuff, we can support your hair externally. K18 for structural repair, Davines for hydration and scalp health, and cutting and styling techniques that work with what you have right now.
Book at Reverie — we pay attention to the whole picture.
