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Isntree C-Niacin Toning Ampoule scores 8.1/9.8 and Sunday Riley A+ High-Dose Retinoid Serum scores 8.0/9.8 — a near-tie where your skin type decides the winner.
These two are neck and neck — just 0.1 points apart.
Scores last verified: April 2026
21 unique
39 unique
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 A+ High-Dose Retinoid Serum scores 5.3 here versus 4.7 for Isntree C-Niacin Toning Ampoule. That difference comes down to how each formula is built — the ingredient list tells the story.
Isntree C-Niacin Toning Ampoule brings Niacinamide, Melia Azadirachta Flower Extract, and Melia Azadirachta Leaf Extract as actives, while sunday Riley A+ High-Dose Retinoid Serum relies on Retinol, Ubiquinone, and Honey Extract. Both approaches have merit, but the positioning and supporting ingredients make the difference.
Isntree C-Niacin Toning Ampoule is better if you have
Sunday Riley A+ High-Dose Retinoid Serum is better if you have
At budget pricing with a score of 8.1, Isntree C-Niacin Toning Ampoule delivers strong value. Sunday Riley A+ High-Dose Retinoid Serum sits at the premium level with a 8.0 score — the extra cost doesn't translate to better scores here.
It's a close call — both products score within 0.3 points of each other. Your choice depends on your specific skin concerns.
Based on ingredient analysis, Isntree C-Niacin Toning Ampoule 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.
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© 2026 Gracie. All rights reserved. Data sourced from Open Beauty Facts (ODbL) and EU CosIng.