Which is better: Kiehl's Since 1851 Micro-Dose Anti-Aging Retinol Serum with Ceramides & Peptide or Peter Thomas Roth Peptide Skinjection™ Amplified Wrinkle-Fix Refillable Serum?

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.

Do Kiehl's Since 1851 Micro-Dose Anti-Aging Retinol Serum with Ceramides & Peptide and Peter Thomas Roth Peptide Skinjection™ Amplified Wrinkle-Fix Refillable Serum share ingredients?

Yes, they share common ingredients. Check the ingredient face-off section above for a detailed comparison.

What's the main difference between Kiehl's Since 1851 Micro-Dose Anti-Aging Retinol Serum with Ceramides & Peptide and Peter Thomas Roth Peptide Skinjection™ Amplified Wrinkle-Fix Refillable Serum?

The key differences are in their active ingredients and formulation approach. Check the attribute battle above for a detailed breakdown.

Kiehl's Since 1851 Micro-Dose Anti-Aging Retinol Serum with Ceramides & Peptide vs Peter Thomas Roth Peptide Skinjection™ Amplified Wrinkle-Fix Refillable Serum

Kiehl's Since 1851 Micro-Dose Anti-Aging Retinol Serum with Ceramides & Peptide scores 8.9/9.8 vs Peter Thomas Roth Peptide Skinjection™ Amplified Wrinkle-Fix Refillable Serum at 8.3/9.8. Kiehl's Since 1851 Micro-Dose Anti-Aging Retinol Serum with Ceramides & Peptide wins for active ingredients.

Kiehl's Since 1851

Micro-Dose Anti-Aging Retinol Serum with Ceramides & Peptide

serumpremium

Why Kiehl's Since 1851 Micro-Dose Anti-Aging Retinol Serum with Ceramides & Peptide comes out ahead

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 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.

Hydration Efficacy is another area of separation. Peter Thomas Roth Peptide Skinjection™ Amplified Wrinkle-Fix Refillable Serum 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 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.

Best for your skin type

Kiehl's Since 1851 Micro-Dose Anti-Aging Retinol Serum with Ceramides & Peptide is better if you have

Sensitive skin — the low-irritation formula keeps things gentle
Dry or dehydrated skin that craves moisture, thanks to Glycerin
Targeting specific concerns like aging or uneven tone — Niacinamide does the heavy lifting

Peter Thomas Roth Peptide Skinjection™ Amplified Wrinkle-Fix Refillable Serum is better if you have

Sensitive skin — the low-irritation formula keeps things gentle
Dry or dehydrated skin that craves moisture, thanks to Butylene Glycol
Anyone who prefers clean, well-vetted formulations

Value comparison

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.

Kiehl's Since 1851 Micro-Dose Anti-Aging Retinol Serum with Ceramides & Peptide vs Peter Thomas Roth Peptide Skinjection™ Amplified Wrinkle-Fix Refillable Serum

Micro-Dose Anti-Aging Retinol Serum with Ceramides & Peptide

Peptide Skinjection™ Amplified Wrinkle-Fix Refillable Serum

Attribute battle

Hydration Efficacy

Irritation Risk

Active Ingredient Strength

Ingredient Transparency

Formulation Safety

Ingredient face-off

Only in Kiehl's Since 1851 Micro-Dose Anti-Aging Retinol Serum with Ceramides & Peptide

Shared ingredients

Only in Peter Thomas Roth Peptide Skinjection™ Amplified Wrinkle-Fix Refillable Serum

Why Kiehl's Since 1851 Micro-Dose Anti-Aging Retinol Serum with Ceramides & Peptide comes out ahead

Best for your skin type

Value comparison

Frequently asked questions

Which is better: Kiehl's Since 1851 Micro-Dose Anti-Aging Retinol Serum with Ceramides & Peptide or Peter Thomas Roth Peptide Skinjection™ Amplified Wrinkle-Fix Refillable Serum?

Do Kiehl's Since 1851 Micro-Dose Anti-Aging Retinol Serum with Ceramides & Peptide and Peter Thomas Roth Peptide Skinjection™ Amplified Wrinkle-Fix Refillable Serum share ingredients?

What's the main difference between Kiehl's Since 1851 Micro-Dose Anti-Aging Retinol Serum with Ceramides & Peptide and Peter Thomas Roth Peptide Skinjection™ Amplified Wrinkle-Fix Refillable Serum?

Kiehl's Since 1851 Micro-Dose Anti-Aging Retinol Serum with Ceramides & Peptide vs Peter Thomas Roth Peptide Skinjection™ Amplified Wrinkle-Fix Refillable Serum

Head to head

Micro-Dose Anti-Aging Retinol Serum with Ceramides & Peptide

Peptide Skinjection™ Amplified Wrinkle-Fix Refillable Serum

Score comparison

Attribute battle

Hydration Efficacy

Irritation Risk

Active Ingredient Strength

Ingredient Transparency

Formulation Safety

Ingredient face-off

Only in Kiehl's Since 1851 Micro-Dose Anti-Aging Retinol Serum with Ceramides & Peptide

Shared ingredients

Only in Peter Thomas Roth Peptide Skinjection™ Amplified Wrinkle-Fix Refillable Serum

Why Kiehl's Since 1851 Micro-Dose Anti-Aging Retinol Serum with Ceramides & Peptide comes out ahead

Best for your skin type

Value comparison

Our verdict

Frequently asked questions

Which is better: Kiehl's Since 1851 Micro-Dose Anti-Aging Retinol Serum with Ceramides & Peptide or Peter Thomas Roth Peptide Skinjection™ Amplified Wrinkle-Fix Refillable Serum?

Do Kiehl's Since 1851 Micro-Dose Anti-Aging Retinol Serum with Ceramides & Peptide and Peter Thomas Roth Peptide Skinjection™ Amplified Wrinkle-Fix Refillable Serum share ingredients?

What's the main difference between Kiehl's Since 1851 Micro-Dose Anti-Aging Retinol Serum with Ceramides & Peptide and Peter Thomas Roth Peptide Skinjection™ Amplified Wrinkle-Fix Refillable Serum?