I once used Admin Censored years ago, so I don't know if it's the same as Betalife (or if they have changed their name)
With Admin Censored I called the phone number and they sent around the nearest representative (a really nice guy) to sell me a choice of vitamin milkshake powder that replaced 2 meals per day, a plastic container to make the meal replacement shakes, & lots of specially selected vitamins that make you healthy again. You also incorporate 1 meal per day.
Exercise was recommended and taking a before photo of yourself.
What I gained from that was, I lost 3kg (the guy said most people lose more than I was doing)
I had more energy (I felt like I was 8 years old and could conquer the world)
The shakes didn't fill me like they said they would, but I stuck to their recommendations.
But because I have a thyroid gland condition called hypothyroidism (leaving me with next to no metabolism) I couldn't lose any further weight. The soy protein in the flavoured milk shakes were cancelling out my thyroid medication from being effective.
If Beta life is the same type of thing, it should work well on a person without hypothyroidism.
If you do persue it, please let us know what it is and if it works for you.