COSRX The 6 Peptide Skin Booster Serum vs Sunday Riley B3 Nice 10% Niacinamide Serum
COSRX The 6 Peptide Skin Booster Serum scores 8.5/9.8 and Sunday Riley B3 Nice 10% Niacinamide Serum scores 8.5/9.8 — a near-tie where your skin type decides the winner.
Head to head
The 6 Peptide Skin Booster Serum
B3 Nice 10% Niacinamide Serum
Score comparison
These two are neck and neck — just 0.0 points apart.
Scores last verified: July 2026
Attribute battle
Hydration Efficacy
COSRX WINSIrritation Risk
TIEActive Ingredient Strength
Sunday Riley WINSIngredient Transparency
COSRX WINSFormulation Safety
TIEIngredient face-off
12% overlapOnly in COSRX The 6 Peptide Skin Booster Serum
35 unique
Only in Sunday Riley B3 Nice 10% Niacinamide Serum
38 unique
Why these two are neck and neck
These two serums take different paths to a similar destination. Both formulas include solid hydrating ingredients, and the overall scores reflect that — the gap here is genuinely slim.
Active Ingredient Strength is another area of separation. Sunday Riley B3 Nice 10% Niacinamide Serum scores 7.6 here versus 6.5 for COSRX The 6 Peptide Skin Booster Serum. That difference comes down to how each formula is built — the ingredient list tells the story.
COSRX The 6 Peptide Skin Booster Serum brings Niacinamide, Acetyl Hexapeptide-8, and Dipeptide Diaminobutyroyl Benzylamide Diacetate as actives, while sunday Riley B3 Nice 10% Niacinamide Serum relies on Niacinamide, Resveratrol, and Asiaticoside. Both approaches have merit, but the positioning and supporting ingredients make the difference.
Best for your skin type
COSRX The 6 Peptide Skin Booster Serum is better if you have
- Sensitive skin — the low-irritation formula keeps things gentle
- Dry or dehydrated skin that craves moisture, thanks to Dipropylene Glycol
- Anyone who prefers clean, well-vetted formulations
Sunday Riley B3 Nice 10% Niacinamide Serum is better if you have
- Sensitive skin — the low-irritation formula keeps things gentle
- Targeting specific concerns like aging or uneven tone — Niacinamide does the heavy lifting
- Anyone who prefers clean, well-vetted formulations
Value comparison
At mid-range pricing with a score of 8.5, COSRX The 6 Peptide Skin Booster Serum is a decent pick. Sunday Riley B3 Nice 10% Niacinamide Serum sits at the premium level with a 8.5 score — the extra cost doesn't translate to better scores here.
Our verdict
It's a close call — both products score within 0.3 points of each other. Your choice depends on your specific skin concerns.
Frequently asked questions
Which is better: COSRX The 6 Peptide Skin Booster Serum or Sunday Riley B3 Nice 10% Niacinamide Serum?
Based on ingredient analysis, COSRX The 6 Peptide Skin Booster Serum scores higher overall. See the full score breakdown above for details on each attribute.
Do COSRX The 6 Peptide Skin Booster Serum and Sunday Riley B3 Nice 10% Niacinamide Serum share ingredients?
Yes, they share common ingredients. Check the ingredient face-off section above for a detailed comparison.
What's the main difference between COSRX The 6 Peptide Skin Booster Serum and Sunday Riley B3 Nice 10% Niacinamide Serum?
The key differences are in their active ingredients and formulation approach. Check the attribute battle above for a detailed breakdown.