COSRX Made Its Bakuchiol Peptide Serum the Star of Its October Amazon Sale
COSRX discounted eight products by as much as 60 percent on Amazon in the UK and Germany during Prime Big Deal Days, which ran October 6 and 7, 2026. The lineup was built around The Blue Peptide Bakuchiol Plump Glow Serum, a treatment serum that normally retails for 27 US dollars and sold for 21.49 euros during the event. The two day sale has already wrapped, but the price list is worth a look both for what it says about the product COSRX is currently pushing hardest and as a heads up for anyone hoping the same deals resurface next time.
Prime Big Deal Days is Amazon's own autumn sale window, separate from the Black Friday and Cyber Monday events that come later in the year, and brands apply for featured placement rather than just slapping on a generic discount. COSRX used the slot to group its catalog into three named collections rather than running one flat storewide percentage off.
The brand called them the Reset edit, the Skin Longevity edit and the Protection edit. Reset cut prices by up to 60 percent, Skin Longevity by up to 44 percent and Protection by up to 41 percent, according to the official press release COSRX distributed on October 2. Splitting the sale this way let the brand put its newer, higher margin items like the bakuchiol serum next to proven bestsellers like the snail mucin essence, so shoppers browsing one deal would likely scroll past the other.
What the Blue Peptide Bakuchiol Serum Actually Is
The Blue Peptide Bakuchiol Plump Glow Serum first launched nationwide on Amazon and cosrx.com on April 29, 2026, so it isn't brand new, but October's sale is the first time COSRX has pushed it this hard as a flagship item. The formula pairs 0.5 percent copper peptide with 0.25 percent bakuchiol in a 50 milliliter bottle, and the front label also lists collagen, adenosine, niacinamide and hyaluronic acid among the supporting ingredients.
Bakuchiol is a plant derived ingredient that skincare brands commonly reach for as a stand in for retinol. It's generally considered gentler on the skin barrier than retinol, which makes it a common pick for people who want retinol style results without the peeling, redness or sun sensitivity that can come with the real thing. Peptides like the copper peptide used here are a separate category, added to skincare for their role in supporting the skin's own collagen production.
COSRX markets the serum for the appearance of firmness, smoothness and pore size, along with reducing the look of dark spots, and positions it as the centerpiece of what it's calling its skin longevity routine. During the October sale it was the headline item of the Skin Longevity edit at 21.49 euros, a 20 percent cut from its usual price.
Everything Else That Was on Sale
The Reset edit covered two of COSRX's longest running products: the Advanced Snail 96 Mucin Power Essence at 10 euros, a 60 percent discount, and the Advanced Snail 92 All In One Cream at 10.99 euros, down 58 percent. The essence is named for its 96 percent snail secretion filtrate content, and both products are part of the snail mucin lineup that put COSRX on the map with K-beauty shoppers in the first place, long before peptides and bakuchiol entered the brand's catalog.
Alongside the bakuchiol serum, the Skin Longevity edit also included The 6 Peptide Skin Booster Serum at 15.49 euros, 38 percent off, The Peptide Collagen Eye Patch at 12.99 euros, 44 percent off, and the Ceramide Skin Barrier Moisturizer at 14.80 euros, 36 percent off.
The Protection edit was smaller, with the Ultra-Light Invisible Sunscreen SPF50 PA++++ at 10 euros, 41 percent off, and the PDRN Exosome Skinplaning Glaze Mask at 12.08 euros, 29 percent off. COSRX's release notes that the sunscreen ranked first in Amazon's face sunscreen category in both Germany and the UK during April and May 2026, which is likely why it earned a spot in the October lineup.
All of this ran exclusively through COSRX's official Amazon storefronts in the UK and Germany, and the window has since closed. Every item listed above is back to its regular price on Amazon and cosrx.com now, so if the bakuchiol serum or the snail mucin essence caught your eye, it's still available, just without the Prime Big Deal Days markdown.
This particular sale didn't extend to Amazon's US storefront or to YesStyle, Stylevana, Olive Young Global or StyleKorean, which each carry their own rotating COSRX stock and run their own separate promotions throughout the year. If you're shopping from the US or just prefer one of those four, it's worth checking their own current markdowns on the same snail mucin and peptide lines rather than waiting on a European Amazon event to repeat. Either way, this lineup is a decent cheat sheet for which eight COSRX products the brand itself considers worth spotlighting going into the colder months.