The 6 Peptide Skin Booster Serum — Reddit Reviews
by COSRX
Updated September 7, 2026
Hydrating peptide serum boosts absorption and texture; may cause redness or breakouts.
What the community says
A thin, watery peptide serum designed as a first step after cleansing for lightweight hydration and smoothing. Favored by those with normal or combination skin who want better product absorption and a subtle glow. Some users experience breakouts or redness, so cautious patch testing advised.
What this means for you
What people love
Watch out for
Product details
Skin Type
Product Traits
Key Ingredients
Where to buy
Real Reddit threads — 122 mentions across 27 threads
COSRX The 6 Peptide Skin Booster Serum on Reddit, in one place — 27 threads from r/30PlusSkinCare, r/tretinoin and 4 more, summarized.
“CosRX The 6 Peptide Skin Booster (Hyaluronic acid).”
Positive
“At night I wash, HA, Cream”
Positive
“COSRX 6 Peptide Booster Serum”
Positive
“AM * Water Cleanse * Round Lab Dokdo Toner * COSRX 6 Peptide Booster Serum”
Positive
“Routine AM”
Positive
“Laneige Cerapeptide toner mist and also COSRX Peptide Booster.”
Positive
“I got a lot more compliments since I started using both regularly”
Positive
“since I started using both regularly”
Positive
“CosRX peptides first”
Positive
“Other things that are working for me are the Cosrx 6 Peptide serum”
Positive
“Those items have made a big difference over the past couple of months.”
Positive
“So far I've gotten: Cosrx 6 Peptide Booster”
Positive
“CosRX peptide is one of my favorite products and I love being able to get larger size!”
Positive
“The Cosrx snail is 130 ml at Costco vs 100ml at other retailers.”
Positive
“the COSRX peptide booster is my favorite!”
Positive
“So sweet 😍 the COSRX peptide booster is my favorite!”
Positive
“Has anyone tried their new PDRN serum? 🤔 any thoughts?”
Positive
Dupes & Alternatives
Skin1004
Madagascar Centella Asiatica Ampoule
Better for Redness / Irritation
11 shared traits
454 mentions
