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Kiehl's Since 1851 Micro-Dose Anti-Aging Retinol Serum with Ceramides & Peptide scores 8.9/9.8 vs Isntree Hyaluronic Acid Watery Sun Gel SPF 50+ at 8.4/9.8. Kiehl's Since 1851 Micro-Dose Anti-Aging Retinol Serum with Ceramides & Peptide wins for hydration.
Kiehl's Since 1851 Micro-Dose Anti-Aging Retinol Serum with Ceramides & Peptide edges ahead, winning 2 of 5 attributes.
Scores last verified: June 2026
29 unique
9 in common
30 unique
Where Kiehl's Since 1851 Micro-Dose Anti-Aging Retinol Serum with Ceramides & Peptide really shines is hydration efficacy, scoring 9.4 compared to Isntree Hyaluronic Acid Watery Sun Gel SPF 50+'s 8.0. With Glycerin, Butylene Glycol, and Pentylene Glycol in its top ingredients, Kiehl's Since 1851 Micro-Dose Anti-Aging Retinol Serum with Ceramides & Peptide delivers stronger moisture-binding capability.
Active Ingredient Strength is another area of separation. Kiehl's Since 1851 Micro-Dose Anti-Aging Retinol Serum with Ceramides & Peptide scores 7.7 here versus 6.5 for Isntree Hyaluronic Acid Watery Sun Gel SPF 50+. That difference comes down to how each formula is built — the ingredient list tells the story.
Kiehl's Since 1851 Micro-Dose Anti-Aging Retinol Serum with Ceramides & Peptide brings Niacinamide, Acetyl Dipeptide-1 Cetyl Ester, and Adenosine as actives, while isntree Hyaluronic Acid Watery Sun Gel SPF 50+ relies on Niacinamide, Ceramide Np, and Centella Asiatica Extract. Both approaches have merit, but the positioning and supporting ingredients make the difference.
Isntree Hyaluronic Acid Watery Sun Gel SPF 50+ is better if you have
Kiehl's Since 1851 Micro-Dose Anti-Aging Retinol Serum with Ceramides & Peptide is better if you have
At budget pricing with a score of 8.4, Isntree Hyaluronic Acid Watery Sun Gel SPF 50+ is a decent pick. Kiehl's Since 1851 Micro-Dose Anti-Aging Retinol Serum with Ceramides & Peptide sits at the premium level with a 8.9 score — the higher investment pays off in formulation quality.
Kiehl's Since 1851 Micro-Dose Anti-Aging Retinol Serum with Ceramides & Peptide edges ahead with a slightly stronger formulation, but Isntree Hyaluronic Acid Watery Sun Gel SPF 50+ is still a solid pick.
Based on ingredient analysis, Kiehl's Since 1851 Micro-Dose Anti-Aging Retinol Serum with Ceramides & Peptide 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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