Is it safe to take evion 400 daily for long term usage for hair fall or should I take with other vitamins supplements and should I give gap using it.

Worthless. This is vitamin E, one of the great disappointments of 20th century medicine. It was hoped that it would be a wonder antioxidant, but in the big studies, people randomized to receive big doses had no clear health benefits and somewhat increased mortality. If you're a young woman losing your hair, get evaluated for thyroid disease, telogen effluvium, and a few others.