I found just a couple of threads about the Pet Wellbeing Life Gold, and one cat lived just a few weeks after being diagnosed with cancer and starting treatment, including being given the Life Gold, and another didn't ever say whether or not they ever even used it. Their question was much like yours but no one apparently had actually used it that saw the thread.
I'm guessing your furbaby has been diagnosed with some form of cancer? If so, what is the exact diagnosis, and are you treating with any "western" medicine? We do have, unfortunately, many members who have who or had cats with different forms of cancer that might be able to lend their experiences with different forms of actual treatment, or what they did instead of treatment. In my mind, you can always give the Life Gold a try, but if it sounds too good to be true, it probably is . (tht doesn't mean I, personally, wouldn't try it on one of mine if they ever got a similar diagnosis. Desperate times call for desperate measures, and I don't think it would hurt)