I see that I must make a correction to my post above.

I had been taking 5 grams per day with little or no result. Then, I upped the dose to 50 grams per day with very good result.

mrsD, I'll have to track down your d-ribose thread and review it again, and do more research on side effects of d-ribose. I don't have diabetes or blood sugar issues (yet), and I would hate to have to give up this supplement and lose its effects, as it has made all the difference for me.

Thanks, as usual, for your great information and circumspect advice!