I received a sample of this product to examine. I’ve been adding some hyaluronic products on days my skin is drier than usual (thanks, dehydration; thanks, aging), and I’ve been curious about how Peach & Lily Glass Skin Serum ($39) stacks up.

What’s in a Name?

Let’s start with the name, because it’s doing a lot of work. “Glass Skin” is a phrase that’s been strip-mined by every K-beauty-adjacent brand for the last several years, to the point where it barely means anything anymore.

Glass skin refers to skin that’s so smooth, so hydrated, and even-toned that it looks almost translucent. You know, like glass. It’s a fine, if aspirational, aesthetic goal that is probably better served by the teens and twenty-somethings who have not yet been beaten down by life.

It is not, however, a clinical outcome, and no single serum is going to hand it to you in a bottle no matter how pretty the packaging is. Though…the packaging is pretty. It looks nice on my vanity, though I can’t keep it there.

What’s In the Bo…ttle?

I don’t care what a product or brand promises on the box, so let’s check the ingredient list. Peach & Lily Glass Skin Refining Serum’s formula leads with water, propanediol, and butylene glycol. When we look those up, that’s standard solvent and humectant territory, nothing shocking. Then you get to the parts that are actually doing something:

  • Niacinamide: a legitimately well-studied ingredient. There’s decent evidence it helps with barrier support, oil regulation, and evening out tone over time. This isn’t hype; niacinamide earns its reputation.
  • Peach fruit extract: this is the “peach” in Peach & Lily, and it’s mostly a brand signature rather than a heavy-hitting active. Pleasant, on-theme, not the reason your skin will or won’t look different.
  • Madecassoside and asiaticoside: centella-derived, calming, reasonably well-supported for soothing irritation.
  • A stack of hyaluronic acid types (sodium hyaluronate, hydrolyzed hyaluronic acid, sodium acetylated hyaluronate) plus beta-glucan and saccharide isomerate: humectants doing humectant things, pulling water to the skin’s surface.
  • Acetyl octapeptide-3: a peptide included at a modest percentage. Peptides in general skew more “nice to have” than “transformative” (despite what the likes of TikTok would have you believe, so I hear).

So: a competent, unremarkable-in-the-best-sense hydrating and calming serum, built around one genuinely solid active (niacinamide) and a supporting cast of humectants and soothing agents. No exfoliating acids, no retinoids, nothing that’s going to purge your skin or make you photosensitive. So, more positive than anything.

Where I Raise an Eyebrow

But…marketing can’t help itself. The brand copy says they “tested 200+ formulas and conducted over 40 face tests alongside cosmetic chemists to perfect the final formula” and that it contains “clinically effective ingredients.”

I want to know: tested against which benchmark(s), published where, reviewed by whom?

To me, it feels like “clinically effective ingredients” is doing a sleight of hand. Niacinamide is clinically studied, sure. That isn’t the same as this specific 2% concentration in this specific formula being clinically proven to produce the results shown on the product page. That distinction matters, and marketing copy is built to blur it.

I’d also gently push back on any serum being called “revolutionary.” It’s a well-formulated, sensible hydrating serum. The word “revolutionary” is for something the skincare world hasn’t seen before. A niacinamide-peptide-HA hydrating serum is a category that’s had plenty of contenders before this one, even if this one is good.

How it Felt to Use

Texture-wise, Peach & Lily Glass Skin Serum is refreshing and lightweight, absorbs fast, and is not watery-thin. Still, it doesn’t sit on top of the skin either, which I appreciated tremendously because that feeling annoys me.

There was no fragrance that I could detect, no stinging, no purging period, which tracks with an ingredient list that skips actives nd exfoliants. My skin felt hydrated and a little calmer after a few weeks of consistent use, particularly on days when it was looking irritated or blotchy.

I used my serum after my morning vitamin C serum, before my moisturizing sunscreen. At night, if I used it, I used it before CeraVe Moisturizing Cream.

Did my skin look like “glass”? No. (I am also 35 with a high-stress career and a slew of other things common to this age.) Did it look noticeably smoother and less reactive? Yes, modestly, and modestly is a word I trust more than the word “revolutionary.” Moisture retention seemed better, too – but I do live in a humid climate at this time of year.

A Point of Caution

One practical note that virtually any hyaluronic product and brand doesn’t emphasize enough: humectants like hyaluronic acid pull moisture toward the skin’s surface. In a dry climate, if you don’t lock in that moisture afterward, you can lose hydration rather than gain it.

So: Layer a moisturizer on top. Don’t skip that step and end up having a bad time.

The Bottom Line

Despite my customary derision of the marketing copy, I do think Peach & Lily’s Glass Skin Refining Serum is solid.

But it isn’t cheap: at $39 for 40mL (1.35 fl oz), I wish I was seeing more performance from it. As I was writing this, I learned that Peach & Lily does have a rewards program. If you already use this, or see yourself using it often, that may make it more accessibly for you.

Overall, it is a gentle hydrating serum with one genuinely useful active supported by humectants and calming agents. I believe it could be a good fit for you if your skin is sensitive, reactive, or if you’re looking for a low-risk way to add hydration and a little brightness to your routine.

What it is not is a magic bullet that will turn your skin into “glass” through marketing alone. No product from any brand, at any price point, is going to do that either. Buy it for what it is, not for what the name promises.