It seems like it is different for everyone, but I get really bad joint pain from winny. So bad I stopped and switched to anavar .

There is some research done that shows winny hurts "collagen synthesis" in the joints.

You might try a search on "collagen" but basically the research (if it is true) shows that enough winny can make a 20 year olds joints as fragile as a 50 year olds.