Chally,
I have been on IsoSource 1.5 for 20 months without any issue, consuming five per day as my sole source of nutrition outside of the occasional Ensure while traveling. It certainly stabilized my weight as I had lost 60 lbs in the 6 months before starting it. I lost about a pound a month after I started IsoSource until I got to around 195, where I have stayed for the past 4 or 5 months
I have had no GI issues while taking it. The only issue I have is with the VA only sending a 30 day supply and only giving me 3 refills with each prescription.
By the way, if you talk them into Kate Farms, please let me know.
Dave