In Captain Marvel we are shown that Vers/Carol has an implant that appears to help her control or regulate her powers, and lights up on occasion. What exactly is it, and what does it do?
From the film we learn it was implanted on her by the Supreme Intelligence when she was brought to the Kree. Carol/Vers is led to believe her powers were given by the Supreme Intelligence and can also be taken away via this implant.
Toward the end of the film Carol learns her true origin and is able to overpower the inhibitor implant because the Kree were never the source of her power.