hey {{first_name | friend}},
You've switched shampoos twice, started taking biotin gummies every morning, and you're still pulling more hair out of the shower drain than you used to, nails snapping at the edges no matter what you put on them.
I went through a stretch of exactly this, adding supplement after supplement, certain my hair care routine was the problem.
Bloodwork eventually told a completely different story.
Turns out thinning hair and brittle nails are often signs your body isn't absorbing nutrients properly, not signs of a hair care problem at all. Conditions that affect your gut, including bacterial overgrowth, can quietly block iron, B12, and zinc from ever reaching you.
You're probably not doing your hair care wrong. The actual shortage might be happening several inches below your scalp, somewhere that never once occurred to check.
Research suggests conditions that disrupt your small intestine, including bacterial overgrowth, can meaningfully block the absorption of iron, vitamin B12, zinc, and biotin, all nutrients your hair follicles depend on to keep functioning normally.
Studies show iron specifically plays a direct role in carrying oxygen to your hair follicles. When your stored iron runs low, even while your regular diet looks perfectly fine on paper, follicles can become starved of oxygen, leading to excessive shedding and slower regrowth. The same pattern shows up with brittle, easily broken nails, since iron deficiency is a well-documented cause of exactly that.
It's worth being clear about what's actually established here versus what's still just a theory. Malabsorption causing a nutrient deficiency, and that deficiency disrupting hair and nails, is well supported by real research. The idea that gut bacteria alone directly cause hair loss, with no deficiency involved at all, is much less settled, mostly small studies so far.
The bottom line:
Persistent hair thinning or brittle nails that haven't responded to hair products may be a nutrient story, not a hair story. It's less "wrong shampoo" and more "your gut might not be letting the nutrients you eat actually reach you."
This means more biotin or a new conditioner may never fully fix it if a real deficiency, and whatever's causing it, is still happening underneath. This connection doesn't apply to everyone's hair loss, so if shedding is significant or sudden, it's worth getting bloodwork done and mentioning any digestive symptoms to your doctor at the same time.
Three things to explore:
Try eating iron-rich foods alongside a source of vitamin C in the same meal, since research suggests vitamin C can meaningfully improve how much iron your body actually absorbs from that sitting.
Consider spacing coffee or tea away from iron-rich meals, since research suggests the tannins in both can noticeably reduce how much iron you actually absorb at that sitting.
Experiment with asking for a ferritin test specifically rather than just a general iron panel, since many people find ferritin catches a deficiency standard panels can miss.
These are general educational concepts based on research, not personal medical recommendations. Some people with certain medical conditions may need different approaches. Always work with qualified healthcare professionals when making changes to eating patterns.
Hair loss gets treated like a cosmetic problem almost by default. For some people, the real story was happening somewhere nobody thought to look.
Next up, I'm looking at a habit almost everyone has right after finishing a meal, and why it might be quietly working against the very thing it feels like it's helping.
If your hair or nails have ever gotten worse despite everything looking fine on the outside, hit reply and tell me.
Sophie