Brittle nails can be frustrating and affect daily life.Biotin is a B vitamin that supports healthy hair, skin, and nails.
Studies have shown that biotin may help improve nail strength and reduce brittleness.
The recommended dosage for biotin is 2.5 mg (or 2500 mcg) per day. To encourage faster hair and nail growth, some supplements are available with 10,000 mcg / 10 mg biotin.
10,000 mcg or 10 mg biotin is not too much and has no adverse effects as per Mayoclinic
Other ways to promote nail health - In addition to biotin, maintaining a balanced diet, staying hydrated, and avoiding harsh chemicals can help improve nail health.