What do you do? methylprednisolone 125 mg “When I learned that I tested positive for a substance that is banned under the NFL policy, I was shocked and confused,” Jenkins said.   “It’s an obscure substance that I’ve never even heard of, and I still don’t know how it got into my body.  My only guess is that it came from one of the supplements I was taking around the time of the test, even though none of them listed anything banned.”