Within that middle step?

It’s all in the details, which we asked an expert to break down.

What’s the difference between an ampoule and a serum?

Jamie Schneider

But generally, you’ve got the option to think of ampoules as potent, supercharged serums.

“I compare it to working out,” saysAlicia Yoon, celebrity esthetician and founder ofPeach & Lily.

But again, there are no stringent guidelines for what’s considered an ampoule versus a serum.

When should you use an ampoule?

Because ampoules are so highly concentrated, you don’t want to use these treatments on the regular.

And if you start to face some irritation or reactive skin?

““Those are obvious signs to slow it down.”

How to use it.

Again, you don’t want to use these treatments every single day.

As for how to incorporate ampoules into your routine?

(And followed up with sunscreen, if you use them in your morning regimen.)

The takeaway.