[Hawkwind]

Are you still having problems with your arm? If so try using a Glucosamine/Chrondrotin/MSM combination. You take centrum so you may not need to add extra C, but if you can it helps the body to 'use' the glucosamine/chondroitin/MSM more efficiently. The combination of the three helps to repair and strengthen the joints, tendons and ligaments, renew synuvial joint fluid and reduce inflammation. (It takes a couple weeks to feel a difference.)

The rest of your supplements make sense for someone our age. I myself take saw palmetto along with my other herbals.

It's probably going to take a couple weeks before you experience a difference with the tribulus. I was happy with the results and will be using trib again this coming winter.