Question

Bhagavath geetha had little impact until the commentary written by

Answer 1

maharshi ved vyas has written bhagvath gita

Answer 2

The entire Bhagavad Gita was spoken by Lord Krishna in the warfield of the Kurukshetra.The entire book was just in a commentary form which had a little impact on the Hindu religion.

Later Maharshi Ved Vyas manually wrote the whole commentary in a form of book,which is today's Bhagavad Gita.