Drinking it will refund all the points you have invested in your skill tree so you can respec yourself with the knowledge of what you actually want. There is a special item found in the Witcher 3 called the Potion of Clearance.
How To Reset Your Skill Points In The Witcher 3 If you want to erase your errors and redistribute all the points you've collected, check out this guide. Thankfully you're not stuck with your decisions permanently. You'll acquire plenty of skill points as you explore the world and take on the seemingly endless amount of quests, but some skills might look good in theory, only to turn out to be a total waste of your points. Geralt is one of, if not the, best Witchers there is in The Witcher 3, but even he can only learn so much.
Here's how you can respec yourself to take on the challenge at hand.
A Witcher is prepared for anything, but there are times in The Witcher 3 where you might realize the skills you've invested in aren't quite what you need.