Many medical conditions can affect the brittleness of nails, meaning that they easily crack, chip, split, or peel. Thin and brittle nails, referred to as Onychoschizia, can also be a sign of hypothyroidism. Taking biotin vitamin supplements can help with some cases of brittle nail, and applying moisturisers after soaking them in water can also be beneficial.
Nailner is used to prevent fungi entering the nails because it creates an environment that it is unsuitable for fungi to survive. Nailner also contains moisturisers that help cracked brittle nails to recover.