Where Kiehl's Since 1851 Micro-Dose Anti-Aging Retinol Serum with Ceramides & Peptide really shines is active ingredient strength, scoring 7.7 compared to First Aid Beauty Ultra Repair Retinol Eye Cream with Retinol, Squalane + Ceramides's 4.9. Its formula features Niacinamide, Acetyl Dipeptide-1 Cetyl Ester, and Adenosine in high positions, signalling meaningful concentrations.
Hydration Efficacy is another area of separation. First Aid Beauty Ultra Repair Retinol Eye Cream with Retinol, Squalane + Ceramides scores 9.8 here versus 9.4 for Kiehl's Since 1851 Micro-Dose Anti-Aging Retinol Serum with Ceramides & Peptide. 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 first Aid Beauty Ultra Repair Retinol Eye Cream with Retinol, Squalane + Ceramides relies on Saccharomyces Ferment, Retinol, and Caffeine. Both approaches have merit, but the positioning and supporting ingredients make the difference.
Both sit in the premium bracket, so value comes down to formulation quality. Kiehl's Since 1851 Micro-Dose Anti-Aging Retinol Serum with Ceramides & Peptide gets the nod here with its 8.9 overall score — you're getting more for a similar outlay.
