Do polynucleotide injections improve skin quality?

What we can tell you today: how thoroughly this has been studied.

The evidence stops at small studies

3 studies in people, but all of them small or without a comparison group. Enough to suspect something, too little to be sure.

This says how thoroughly something has been studied — not whether it works for you. What each study actually found is in the study itself, and in the plain-language write-ups we are adding.