Just vitamin...not enough...You are suffering from hormonal changes causing Androgenetic alopecia causing hair fall. It's completely stoppable even regrowth of hair is possible with certain medications without any side effects. Treatment depends on the grade of hair loss. So, it's a must for diagnosing which grade, you are in for an effective treatment. Please  send photos of your head, by direct online consultation for accurate diagnosis and proper treatment.

These are multivitamins. You cannot use them continuously. You can take gaps and start them again. There is no harm in taking after a gap. For further discussion please consult online.