My wife and I have done this and it really helps.
More here:
Fasting-mimicking diet causes hepatic and blood markers changes indicating reduced biological age and disease risk
https://www.nature.com/articles/s44324-023-00002-1?_kx=Ejga-vG6ImKKgsFBkEltlQ.XqzShz
We bought it here:
Do you have to do it 3 months in a row. My hub and I did the Prolon FMD once about 8 years ago..we did NOT like it at all...felt run down by the end. My mindset might be different now, tho.