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Kiehl's Retinol Skin-Renewing Daily Micro-Dose Serum scores 9.0/9.8 vs Peter Thomas Roth Peptide Skinjection™ Amplified Wrinkle-Fix Refillable Serum at 8.3/9.8. Kiehl's Retinol Skin-Renewing Daily Micro-Dose Serum wins for active ingredients.
Kiehl's Retinol Skin-Renewing Daily Micro-Dose Serum edges ahead, winning 1 of 5 attributes.
Scores last verified: June 2026
33 unique
9 in common
22 unique
Where Kiehl's Retinol Skin-Renewing Daily Micro-Dose Serum really shines is active ingredient strength, scoring 7.8 compared to Peter Thomas Roth Peptide Skinjection™ Amplified Wrinkle-Fix Refillable Serum's 4.3. Its formula features Niacinamide, Acetyl Dipeptide-1 Cetyl Ester, and Adenosine in high positions, signalling meaningful concentrations.
Kiehl's Retinol Skin-Renewing Daily Micro-Dose Serum brings Niacinamide, Acetyl Dipeptide-1 Cetyl Ester, and Adenosine as actives, while peter Thomas Roth Peptide Skinjection™ Amplified Wrinkle-Fix Refillable Serum relies on Saccharomyces Lysate, Acetyl Hexapeptide-8, and Pentapeptide-18. Both approaches have merit, but the positioning and supporting ingredients make the difference.
Kiehl's Retinol Skin-Renewing Daily Micro-Dose Serum is better if you have
Peter Thomas Roth Peptide Skinjection™ Amplified Wrinkle-Fix Refillable Serum is better if you have
Both sit in the premium bracket, so value comes down to formulation quality. Kiehl's Retinol Skin-Renewing Daily Micro-Dose Serum gets the nod here with its 9.0 overall score — you're getting more for a similar outlay.
Kiehl's Retinol Skin-Renewing Daily Micro-Dose Serum edges ahead with a slightly stronger formulation, but Peter Thomas Roth Peptide Skinjection™ Amplified Wrinkle-Fix Refillable Serum is still a solid pick.
Based on ingredient analysis, Kiehl's Retinol Skin-Renewing Daily Micro-Dose Serum 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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