Symptom · Skin, hair & nails
Nails that split, peel and tear. The small, stupid, daily one nobody warns you about.
They snap on the dishwasher rack. They peel back in layers like old paint. They've got ridges running top to bottom that weren't there two years ago. It's a small thing, and it's also the thing you notice fifteen times a day. Nails are keratin, keratin needs estrogen, protein and iron, and midlife often quietly changes all three.
Educational · not medical advice
Your nail plate is made of the same protein as your hair, laid down by the matrix under the cuticle. It takes about six months to grow a fingernail out from root to tip, so what you're looking at today was built half a year ago. Estrogen supports the water-holding capacity and lipid content of the nail plate, which is why nails often get drier, more layered and slower-growing through perimenopause. But nails are also one of the body's honest little dashboards: low ferritin, an underactive thyroid, and not eating enough protein all show up there too. That's why we don't just hand you a biotin gummy and call it done.
Why they're splitting now
Some of this is hormonal. Some of it is checkable with one blood test. Worth knowing which is which.
- 01
Estrogen loss dries out the nail plate
Estrogen supports the lipid and water content of keratin. As it drops, the plate holds less water, the layers separate (that's the peeling), and vertical ridges become more obvious. This is the same mechanism behind drier skin and finer hair, one story in three places.
- 02
Low iron shows up in nails before it shows up anywhere else
Ferritin under about 30 makes nails soft, flat, sometimes spoon-shaped. Heavy or unpredictable perimenopausal bleeding is the most common cause of quietly falling iron in midlife women. Ask for ferritin, not just hemoglobin, they measure different things.
- 03
Thyroid changes travel with menopause
Hypothyroidism is far more common in women over 45, and brittle nails, dry skin, hair thinning, cold, fatigue and low mood are its quiet cluster. If you have more than one of those, a TSH is a reasonable ask.
- 04
Protein intake often drifts down without anyone noticing
Nails are built from amino acids. Appetite changes, smaller meals, skipped breakfasts, and years of low-fat eating add up. Most midlife women are eating well under the 1.2 to 1.6 g per kg that supports muscle, bone, skin and nails.
- 05
Water, gel manicures and hand sanitiser
Repeated wet-dry cycling is genuinely damaging, and it's the part you can change today. Gel and acrylic removal thins the plate every time. Sanitiser strips lipid. None of this caused the change, but all of it makes it worse.
What tends to help
Nails grow slowly, so nothing here shows up quickly. Give any of it three months, that's one full nail.
Get ferritin, TSH and B12 checked once
One blood draw answers most of the question. If ferritin is low, treating it changes nails, hair, energy and sleep all at once. Don't self-supplement iron without testing first, too much is its own problem.
Protein at every meal, roughly 25 to 30 g
This is the single highest-yield change, and it's the same change that protects muscle and bone in midlife. Eggs, Greek yogurt, fish, legumes, tofu, a protein shake if mornings are chaotic.
Biotin only if you're genuinely deficient
Biotin helps brittle nails in the small trials, and true deficiency is rare. It also skews thyroid and troponin blood tests, so stop it a few days before bloods and tell whoever's ordering them. Not the miracle the supplement aisle implies.
Keep them short, and oil the cuticle nightly
Short nails have less leverage to tear. A cheap jojoba or almond oil rubbed into the cuticle and nail fold before bed does more than any strengthening polish. Formaldehyde hardeners make plates more brittle over time, skip them.
3 more practices, plus podcasts, books and research, live in Go deeper below.
03When to get help nowWhen to get it looked at
Emergency red flags, same-week signs, and where to find a menopause-trained practitioner.
When to get it looked at
4 more signs it needs a doctor this week
A dark stripe running down one nail
A new brown or black band, especially on one nail only, or pigment spreading onto the surrounding skin, needs a dermatologist promptly. It's usually benign. It's checked because occasionally it isn't.
One nail thickening, crumbling or lifting off the bed
Usually fungal or psoriatic rather than hormonal, and both have real treatments. A nail clipping sent for testing settles it before anyone commits to months of antifungals.
Spoon-shaped nails, or brittleness with breathlessness and exhaustion
That's iron deficiency until proven otherwise. Ask for ferritin alongside a full blood count, and mention how heavy your periods have been.
Brittle nails with dry skin, hair loss, cold and low mood
The thyroid cluster. A TSH is cheap, quick, and frequently the thing that explains four symptoms at once.
Go deeper
One place for everything else.
Practices to try this week, voices worth hearing, books worth your bedside table, rooms where members are talking, the candid tips Nila would share over a cup of tea, and the research the editorial team is watching.
A photo of the same hand, same light, once a month
Three photos over three months tell you whether new growth from the matrix is coming in better. That's the only honest measure of whether anything you changed is working.
What else travels with it
Hair shedding, dry skin, cold hands, heavier periods, exhaustion. Nails alone are usually hormonal. Nails plus two of those is a blood-test conversation, and a much more useful one.
Colour, shape and the nail fold
Spooning, dark lines, pitting, separation from the bed, or redness and swelling around the fold are all different problems from ordinary brittleness. Note them rather than filing them away.
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