Brittle nails

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.

Some of this is hormonal. Some of it's checkable with one blood test. Worth knowing which is which.

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.

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 people. Ask for ferritin, not just hemoglobin, they measure different things.

Thyroid changes travel with menopause. Hypothyroidism becomes more common after 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.

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 people are eating well under the 1.2 to 1.6 g per kg that supports muscle, bone, skin and nails.

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.

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.

Gloves for washing up, cleaning and gardening. Boring and effective. Wet-dry cycling is the biggest mechanical driver you control. Cotton liners under rubber gloves if your hands sweat.

Take a break from gels. Not forever. But one three-month gap, with the plate oiled and kept short, is often the difference between nails that peel and nails that don't.

MHT isn't prescribed for nails, but it often improves them. Systemic estrogen raises skin collagen and hydration, and people on MHT frequently report better nails and hair as a side benefit. Worth naming if MHT is already on the table for other reasons, not a reason on its own.