The 6 Peptide Skin Booster Serum — Reddit Reviews
by COSRX
Updated August 19, 2026
Peptides and hyaluronic acid hydrate and prep skin for better absorption; watery and light.
What the community says
A very watery serum combining peptides, niacinamide, and hyaluronic acid to boost hydration and prep skin for other products. Popular as a first step on damp skin and for soothing irritated, dehydrated, or aging complexions. Can cause redness or breakouts for sensitive and acne-prone skin.
What this means for you
What people love
- Hydrating mix of peptides and hyaluronic acid
- Lightweight watery texture layers well
- Preps skin for better absorption of following products
Watch out for
Product details
Use caution
Skin Type
Product Traits
Key Ingredients
Where to buy
Real Reddit threads — 110 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
“AM * Water Cleanse * Round Lab Dokdo Toner * COSRX 6 Peptide Booster Serum”
Positive
“Routine”
Positive
“God damn that routine is working for you!”
Positive
“Laneige Cerapeptide toner mist and also COSRX Peptide Booster.”
Positive
“My skin was good to start but I got a lot more compliments since I started using both regularly”
Positive
“I have combination skin, more oily in summer and more dehydrated in winter”
Positive
“I use I'm From Rice toner & CosRX peptides first”
Positive
“I just started to use the VT Cica toner pads every morning and those also make my skin happy.”
Positive
“Other things that are working for me are the Cosrx 6 Peptide serum”
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
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11 shared traits
428 mentions
Anua
Azelaic Acid Hyaluron Redness Soothing Serum
Better for Redness / Irritation
10 shared traits
549 mentions
