I’m seeing it for one single five day fast.
Honestly, you have to watch your electrolytes and such if you do this on your own. I would try it once with their package and then see if you can make your own.
Bone broth or Bouillon takes care of this. It is very important to stay well hydrated and to replace electrolytes when intermittent or fasting.
A somewhat dilute solution of salt water will both kill hunger pangs and keep electrolyte levels correct. “Hunger” pangs (how can anyone be hungry when they are 80 pounds overweight? Think about it) . No special subscription required here either.
Black coffee, and Tea is excellent for fasting. Tea is first a medicine, really. It really helps with gut issues and unmentionable elimination issues that often loom large, having an affinity or beneficial “bad bacteria” in our guts that, just like humans have a taste for glucose. When scientists want to grow nasties in petri dish, they feed them sugar. Our guts work the same way. Gas, bloating and other problems ensue.