​Which vitamin deficiency causes hair thinning?​

​Various factors, including vitamin deficiencies, can contribute to hair thinning issues which affects men and women equally. Several vitamins are crucial for maintaining healthy hair, and their deficiencies can lead to adverse effects on hair growth and thickness. Among the vitamins associated with hair health, deficiencies in vitamin A, vitamin D, vitamin E, and certain B vitamins have been linked to hair thinning.​