What factors are known to affect nail growth?

Nail growth is significantly influenced by various factors, among which nutrition and general health play crucial roles. Adequate nutrition provides the essential vitamins and minerals necessary for the production and strength of nails. For example, biotin, protein, zinc, and various vitamins aid in keratin production, which is vital for nail health. General health, including a well-functioning immune system and the absence of underlying health conditions, also impacts the ability of nails to grow strong and healthy.

While stress levels and climate can have some effect on nail conditions, they are not as direct in influencing the actual rate of nail growth. Similarly, while age and gender can contribute to differences in nail appearance or strength, they do not directly dictate the body's ability to grow nails. Hand washing frequency is related more to hygiene than to the biological processes involved in nail growth. Thus, nutrition and general health are the most significant factors that directly impact the growth of nails.