Yes for sure. You can use the following email:
pfizermedicalinformation@pfizer.com

I actually went through a different email (I believe it might have been via an investor email) but I received a reply from the above email address. They also tried to call me this morning and asked me to call them at 800-438-1985 which I did late this morning. If you call that number you need to hit #1 , then stay on the line for live representative. They really want to talk to people who experienced the arthritis relief and will ask other questions from a personal perspective, like what form of arthritis, other meds, etc. The above number is one which they would typically receive concerns about a particular medication, in this case, of course you would be reporting a positive side effect lol. Anyway, you can send an email explaining your positive effect or call them, either should work, although they may call you if you leave them your number which I did via my initial email! Hope that helps!