A new treatment that blocks an aging-related protein restored lost cartilage in old mice and helped prevent arthritis after knee injuries. Human cartilage samples showed similar signs of regeneration, raising hopes for a future drug that could repair joints instead of replacing them.
Or it causes some new, unexpected side effect
Super human powers when you start growing extra ears or eyes?
I was imagining something that kills you or makes you wish you were dead. But hey, Xmen powers would be cool too.