Yes, I figured I'm a non-responder. Perhaps if I gave it some more time it might play out a bit differently. After all, it has only been six days (as of yesterday), although as I noted I should be fully saturated by now, and I did 2 full workouts while on the stuff, including on the last day. Not a single additional rep or added pound of bodyweight beyond normal day-to-day fluctuations. The thing is, I don't think it's worthwhile, or worth the potential risk, for a very small gain. And then you have to keep taking it...
As I mentioned in the past, I had taken creatine in the later '90s for a longer while (I think it was for more than a month or two), and I don't recall having been especially pleased. Although I do vaguely remember my pants fitting tighter at the waist, which was not a selling feature. I suppose that since I had lost a fair amount of muscle since my 40s and 50s, creatine might have helped me get some of it back. But even if it were to net me, say, a 5-pound gain, I don't think it's worth taking the stuff indefinitely for such an increment.
Two interesting developments about creatine I noted. First, the price seems to have gone up considerably since the time I last looked into it a few years ago. And, second, a number of establishments no longer seem to carry it. If I recall correctly, Costco used to carry it. I know for certain that Walmart did. Neither is carrying it now. I think some pharmacies also sold creatine along with their nutritional supplements, but the four or five pharmacies I visited since deciding to try it again did not have it. That can't be a good sign.
I guess I'll just focus on staying lean and staving off age-related sarcopenia with exercise and good nutrition to the exclusion of everything else. On the plus side, I'm actually a bit leaner than I was a couple or so years ago but have not lost any weight.
*Sigh*
When it comes to getting older, some settling will occur.