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IOPE Expert Vitamin C 25% Antioxidant Serum for Brightening scores 9.0/9.8 vs Sunday Riley B3 Nice 10% Niacinamide Serum at 8.5/9.8. IOPE Expert Vitamin C 25% Antioxidant Serum for Brightening wins for gentle formulation.
IOPE Expert Vitamin C 25% Antioxidant Serum for Brightening edges ahead, winning 2 of 5 attributes.
Scores last verified: June 2026
24 unique
39 unique
Where IOPE Expert Vitamin C 25% Antioxidant Serum for Brightening really shines is irritation risk, scoring 7.7 compared to Sunday Riley B3 Nice 10% Niacinamide Serum's 9.5. IOPE Expert Vitamin C 25% Antioxidant Serum for Brightening keeps its formula cleaner, with fewer known irritants in the mix.
Hydration Efficacy is another area of separation. IOPE Expert Vitamin C 25% Antioxidant Serum for Brightening scores 6.8 here versus 5.1 for Sunday Riley B3 Nice 10% Niacinamide Serum. That difference comes down to how each formula is built — the ingredient list tells the story.
IOPE Expert Vitamin C 25% Antioxidant Serum for Brightening brings Ascorbic Acid, Gluconolactone, and Glutathione 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.
IOPE Expert Vitamin C 25% Antioxidant Serum for Brightening is better if you have
Sunday Riley B3 Nice 10% Niacinamide Serum is better if you have
Both sit in the premium bracket, so value comes down to formulation quality. IOPE Expert Vitamin C 25% Antioxidant Serum for Brightening gets the nod here with its 9.0 overall score — you're getting more for a similar outlay.
IOPE Expert Vitamin C 25% Antioxidant Serum for Brightening edges ahead with a slightly stronger formulation, but Sunday Riley B3 Nice 10% Niacinamide Serum is still a solid pick.
Based on ingredient analysis, IOPE Expert Vitamin C 25% Antioxidant Serum for Brightening scores higher overall. See the full score breakdown above for details on each attribute.
Yes, they share common ingredients. Check the ingredient face-off section above for a detailed comparison.
The key differences are in their active ingredients and formulation approach. Check the attribute battle above for a detailed breakdown.
Honest skincare intel. No jargon, no gatekeeping — just the ingredients decoded.
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© 2026 Gracie. All rights reserved. Data sourced from Open Beauty Facts (ODbL) and EU CosIng.