Most nails break easily because of moisture imbalance specifically the cycle of wetting and drying that strips the nail plate of the water it needs to stay flexible. In most cases it is not a vitamin deficiency, not bad genetics, and not something you are permanently stuck with. Fix the moisture cycle and the breakage usually stops.
The honest answer that most articles skip: biotin supplements get all the attention, but if your nails are breaking, there is a high chance your hands are in water too often dishes, hand washing, cleaning without any barrier protection. Repeated soaking followed by drying causes the nail plate keratin to expand and contract constantly, weakening the bonds between layers until peeling and snapping become the default. That cycle, not a missing vitamin, is behind the majority of cases.
The condition has a clinical name brittle nail syndrome, clinically referred to as onychorrhexis when vertical ridges and splitting appear, or onychoschizia when the free edge layers horizontally and it affects roughly 20% of the population, with women significantly more likely to experience it. Knowing the name matters less than knowing what drives it: moisture fluctuation and chemical exposure are the two biggest culprits. Acetone-based removers, household cleaners, and hand sanitisers all strip the nail of its natural oils faster than the body can replace them.
There are two distinct types worth separating. Dry and brittle nails snap cleanly too little moisture. Soft and brittle nails bend and tear at the sides usually too much moisture from prolonged water exposure. The fix for each is slightly different. Dry nails need cuticle oil applied consistently, particularly before bed. Soft nails need gloves during wet work to limit saturation in the first place.
When both fingernails and toenails are affected at the same time, that is a different signal. It points toward something systemic iron deficiency, thyroid imbalance, or nutritional gaps and merits a conversation with your GP rather than a new nail oil. For isolated fingernail breakage, the external causes are almost always responsible.
The practical fix is not complicated. Keep nails shorter while you rebuild strength, apply cuticle oil twice daily, and wear nitrile gloves for any task involving prolonged water or chemical contact. A flexible base coat adds a physical barrier during the day. Most people see improvement within six to eight weeks of protecting consistently, because fingernails grow roughly three millimetres per month patience is the part nobody tells you to plan for.
