Plumping skin care is having a moment, and it's easy to see why. If you want skin that looks bouncy and smooth without booking an injector appointment, a serum is a far gentler place to start. Glamour editors recently tested Kiehl's 1cc CollaShot Plump Serum across several skin types, and their verdict is useful if you're deciding whether it deserves a spot on your shelf.
Here's what they found, what's in the bottle, and how to give a serum like this a fair trial at home.
The Short Version of the Verdict
Per Glamour, the overall takeaway is that the serum delivers a bouncy, post-facial glow without feeling sticky or heavy. That texture point matters. Many hydrating serums leave a tacky film that makes layering moisturizer or makeup a chore. A lightweight finish means this one should slot into a routine without much fuss.
Glamour's testers focused on whether the formula could visibly plump, hydrate, and soften the look of fine lines. Note the phrase "look of": this is a cosmetic serum, so think temporary, surface-level smoothness rather than anything that changes your skin's structure.
What's Inside
Glamour highlights three ingredients:
- Collagen polypeptides: the headline ingredient, and the source of the "CollaShot" name.
- Vitamin B12: a less common name on serum labels.
- Rhamnose: a sugar-derived ingredient that rounds out the plumping pitch.
I can't tell you from the reporting exactly how each one performs on its own, so treat the list as a guide to what the brand is aiming for: bounce, hydration, and a softer look to fine lines.
Why It Appeals Right Now
It's not hard to see the appeal. Beauty costs keep climbing, and many people are tired of the filler look and the maintenance that comes with it. A serum that promises a plump, glowy finish sits in a comfortable middle ground: low commitment, daily ritual, no appointment.
Keep expectations realistic, though. A serum can make skin look smoother and feel more hydrated. It isn't a stand-in for a medical or injectable treatment, and no review should lead you to expect that.
How to Test a Plumping Serum Fairly
Reviews across different skin types are helpful, but your own skin is the real test. A simple plan:
- Patch test first. Apply a small amount on your inner arm or behind your ear for a day or two, especially if your skin is sensitive.
- Start with a few pumps at most. Apply to clean, slightly damp skin so it spreads easily.
- Follow with moisturizer. Serums add hydration; a moisturizer helps it stay put.
- Use it consistently for a couple of weeks. Note how your skin looks in the morning, not just right after application.
- Try it under makeup. A smoother, hydrated base is one of the easiest things to judge. Check whether foundation sits better and whether dry patches look less obvious.
Match the Test to Your Skin Concern
Glamour tried the serum across a range of skin types, which is the right idea. Here's what to watch for depending on yours:
Dry skin
Look for whether skin feels comfortable hours later, not only right after you apply it.
Skin prone to breakouts
Pay attention to whether a lightweight formula sits well under sunscreen and moisturizer, and introduce it slowly.
Sensitive skin
Go slowly, use it once a day at first, and stop if you notice irritation.
Fine lines and texture
Take a photo in the same natural light before you start and again after two weeks. Your eyes adjust quickly, and a photo is more honest.
Is It Worth Adding to Your Routine?
If you like a glowy, cushiony finish and want something that doesn't feel heavy, Glamour's experience suggests this serum is worth a look. If your routine already works and you're happy with it, there's no urgency to change anything.
The smartest move is to treat any plumping product as a two-week experiment: patch test, apply a few pumps to damp skin, photograph your results, and judge by how your skin actually looks and feels.