If life coaches had a professional body, I'd complain to it.
There is a professional body for coaches, it’s called the ICF. It’s the body for coaches in all sorts of areas including executive, leadership, career etc. I suspect the issue is that many or all of these people describing themselves as coaches aren’t members of it or particularly professional, and may well not even be actually coaching.
As a PP said the ICF is an independent body with a pretty rigorous Credentialling process, including a minimum number of recognised coach training hours, recorded coaching sessions submitted that must demonstrate a high level of the coaching competencies, an online exam, and being mentored on your coaching skills by a senior coach. You also have to sign up to the ICF code of ethics, and complete a certain amount of CPD to renew your credential.
Coaching is an emerging profession with a sound and growing evidence base behind it. However, as anyone can call themselves a coach without even being aware of all of that, it is a bit of a buyer beware situation and you need to do your research.