The 6 Peptide Skin Booster Serum — Reddit Reviews
by COSRX
Updated September 23, 2026
Watery peptide booster that preps layers and helps dull, dehydrated skin.
What the community says
A thin first-step serum with niacinamide, six peptides, glycerin, and sodium hyaluronate. Best for dehydrated, dull, or retinoid-stressed skin that wants more slip and layering help. Some people get redness, breakouts, or zero payoff.
What this means for you
What people love
- Watery first-step layer
- Helps later products sink in
- Niacinamide plus peptides for glow
Watch out for
Product details
Use caution
Skin Type
Product Traits
Key Ingredients
Real Reddit threads — 137 mentions across 27 threads
COSRX The 6 Peptide Skin Booster Serum on Reddit, in one place — 27 threads from r/30PlusSkinCare, r/tretinoin and 3 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
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11 shared traits
507 mentions
Anua
Azelaic Acid Hyaluron Redness Soothing Serum
Better for Redness / Irritation
10 shared traits
676 mentions
