Mine didn't respond to stretching or special balance exercises performed on steps or to running backwards a half-mile a day, but it was never that bad (guys I play hoops with, who are my age, seem to have it much worse). When I injured a knee playing basketball, I also stopped running for a few months and within a couple weeks there wasn't any tendinitis pain at all. But last February, when I started playing hoops and running again, the tendinitis came right back. By the time I got as high as 200 mg (50%) RSV, once in the morning and once at night, the pain/inflammation was negligible. Not only that pain but other miscellaneous aches and pains associated with a once-a-week hoops game that formerly left me limping about for 2 or 3 days afterward.I got achilles tendonitis years ago, big time, before anyone heard of resveratrol. It looked like a golf-ball attached to my heel. The doctor laughed and called it the best example he'd ever seen, took pictures. I got it running up hills in Georgia. Lots of stretching, ice and rest, some ibuprofen and in two weeks I could run again. It hasn't recurred. Not even with large doses of resveratrol. If you are active, and you increase your activity level, or do something different, like running hills when you are used to flat, you can get tendonitis. If taking resveratrol makes you feel stronger, you are likely to increase your activity level. Treat it like any other injury.
All the tendinitis discussion in here could lead to an "anti-placebo" effect and generate gratuitous reports of tendinitis. As well, the Long**** guy might be further tempted to continue to try to exploit them. But if these tendinitis reports are groundlessly associated with RSV, then in time, this should bear itself out....