Why Nails Split and Peel, and What Actually Helps

Nails that peel into thin layers or split at the tip are among the most common beauty frustrations. Brittle nails affect up to 20% of people, especially women over 50¹. Many of the everyday things that wear nails down, such as water, harsh products and polish removal, are things you can work around¹⁵. Here is what is going on, what helps, and an honest look at the research on supplements.

What brittle nails look like

Brittle nails split, flake or crumble, and they can become soft and lose their flexibility¹. Dermatologists describe two main patterns, with long names for fairly simple things:

• Peeling in layers (onychoschizia). The free edge of the nail separates into fine horizontal layers¹. It shows up almost only on fingernails and is typical in people who wash their hands very often¹.
• Splitting and ridges (onychorrhexis). Shallow grooves and splits run lengthwise along the surface of the nail¹. It is especially common in middle-aged women¹.

If you only see faint lines running the length of your nails, take heart: the AAD says these are common and usually nothing to worry about⁶.

Why nails split and peel

The layers of a nail are held together by natural fats between its cells, and the nail also stores water. When either is disturbed, nails become more fragile¹. The usual culprits:

• Frequent wetting and drying. Too much water exposure can weaken nails and cause them to split, peel or break³. Nails lose water faster than skin does, so constant washing and sanitizing can leave them dry and brittle⁵.
• Harsh soaps, detergents and solvents. Dermatologists advise limiting contact with water and detergents when nails are fragile¹, and exposure to solvents, for example at work, can dissolve the fats that hold nail cells together¹.
• Polish, removers and long nails. One dermatology review notes that all methods of removing nail products damage healthy nails¹. A Cleveland Clinic dermatologist adds that long nails and regular use of nail cosmetics make splits and breaks more likely⁵.
• Using nails as tools. Opening cans or prying things with your nails can cause chipping, splitting or lifting³.
• Time. Some increase in nail fragility is a normal part of aging¹. Nails also grow more slowly as we get older, so each one spends longer exposed to dry air, water and sanitizers⁵.

Less often, brittle nails can be a sign of a health issue such as a fungal infection, psoriasis, a thyroid condition or not getting enough protein, iron or B vitamins⁵. That is one reason lasting changes deserve a professional look.

Everyday habits that help

Gentle daily habits are the natural place to start. These come up again and again in dermatologist advice:

• Wear gloves for wet work. Gloves for cleaning and washing dishes protect nails from too much water³. One review suggests cotton gloves inside rubber ones².
• Moisturize nails and cuticles. Moisturize after you wash your hands³ and after you trim, since dry nails split more easily⁴. Moisturizers with occlusives such as petrolatum or lanolin, or humectants such as glycerin, can improve nail strength², and a Cleveland Clinic dermatologist suggests a heavy hand cream at bedtime⁵.
• File in one direction. Filing back and forth can weaken your nails⁴.
• Keep them shorter for now. Nails dry out faster when they are not kept short¹, and if they are breaking, a Cleveland Clinic dermatologist suggests clipping or filing them shorter for a while⁵.
• Go easy on removers. One review suggests using nail polish remover no more than twice a month and choosing acetate-based formulas over acetone-based ones².
• Leave your cuticles alone. Cuticles protect the nail root, and cutting them or pushing them back makes it easier for germs to cause an infection⁴.

What the research says about biotin

Biotin, also called vitamin B7, has been studied for brittle nails, and the evidence is encouraging but thin⁷. In an older open study, 71 people with brittle nails took 2.5 mg of biotin a day. Of the 45 whose results were assessed, 41 (91%) showed a marked improvement in nail firmness and hardness after an average of about 5.5 months⁷. In another small study, 22 of 35 people with brittle nails showed clinical improvement⁷.

Those studies have real limits. A dermatology review describes them as small and not well controlled, with one based on a retrospective survey¹. Another review points out that supplement makers are not required to prove effectiveness before selling a product, and calls for more randomized, double-blind, placebo-controlled studies⁷.

One safety note: biotin can interfere with some lab tests, including troponin, a test used to help diagnose a heart attack⁷. If you take biotin, tell your doctor and the lab before any blood work.

What the research says about collagen peptides

A published study of collagen peptides for brittle nails is worth knowing about. In it, 25 people took 2.5 g of VERISOL® bioactive collagen peptides once a day for 24 weeks⁸. Nail growth rate increased by 12%, the frequency of broken nails fell by 42%, and 64% of participants showed an overall clinical improvement⁸.

It is an early signal, not proof. The study was open-label and single-center, with no placebo group, so everyone knew they were taking collagen⁸. A later review that received no outside funding notes its biases, including the lack of blinding, and calls for larger, more rigorous studies⁷. Two of the six authors were affiliated with a collagen research institute⁸. And one review advises that collagen peptides are not recommended during pregnancy or breastfeeding⁷.

If you like a dedicated daily step from within, our Collagen Gummies are made with VERISOL® collagen peptides, and Hair·Skin·Nails Gummies offer a broader blend. The study above looked at the ingredient, not our products, so either one is simply an optional extra.

When to see a dermatologist

Brittle nails usually do not need a doctor visit⁵, but some nail changes do. Book a visit with a board-certified dermatologist if you notice:

• A new or changing dark streak in a nail. Not every streak is melanoma, but it is always worth having one examined⁶.
• A nail lifting away from the skin underneath, which often looks white⁶, or grooves or separation in the nail plate⁵.
• Redness, swelling or soreness around a nail, which can mean an infection⁶⁵.
• Nails that thicken or turn yellow, which can point to a fungal infection⁵, or any other change in color⁶.
• A change in shape, such as thin nails that dip in the middle like a spoon, which can be linked to low iron, or nails that start to curve downward⁶.
• Any nail that changes, swells or hurts³.

If you have diabetes or poor circulation, the AAD says it is especially important to seek treatment for any nail problem³.

The takeaway

Peeling and splitting nails are common, and everyday wear from water, harsh products, polish removal, rough handling and time plays a big part. Gloves, moisturizer, filing in one direction, shorter nails, gentle removers and untouched cuticles make a simple foundation. Biotin and collagen peptides have small, encouraging studies but no firm proof, so treat them as optional and give your nails months, not days. And any change in a nail's color, shape or comfort is worth showing a dermatologist.

This article is for general information and is not medical advice.