Kiehl's Retinol Skin-Renewing Daily Micro-Dose Serum vs Rejuran Dual Effect Ampoule In Mask Firming & Radiance
Kiehl's Retinol Skin-Renewing Daily Micro-Dose Serum scores 8.9/9.8 vs Rejuran Dual Effect Ampoule In Mask Firming & Radiance at 8.4/9.8. Kiehl's Retinol Skin-Renewing Daily Micro-Dose Serum wins for active ingredients.
Head to head
Retinol Skin-Renewing Daily Micro-Dose Serum
Dual Effect Ampoule In Mask Firming & Radiance
Score comparison
Kiehl's Retinol Skin-Renewing Daily Micro-Dose Serum edges ahead, winning 1 of 5 attributes.
Scores last verified: July 2026
Attribute battle
Hydration Efficacy
TIEIrritation Risk
TIEActive Ingredient Strength
Kiehl's WINSIngredient Transparency
TIEFormulation Safety
TIEIngredient face-off
21% overlapOnly in Kiehl's Retinol Skin-Renewing Daily Micro-Dose Serum
33 unique
Shared ingredients
9 in common
Only in Rejuran Dual Effect Ampoule In Mask Firming & Radiance
26 unique
Why Kiehl's Retinol Skin-Renewing Daily Micro-Dose Serum comes out ahead
Where Kiehl's Retinol Skin-Renewing Daily Micro-Dose Serum really shines is active ingredient strength, scoring 7.8 compared to Rejuran Dual Effect Ampoule In Mask Firming & Radiance's 5.8. 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 rejuran Dual Effect Ampoule In Mask Firming & Radiance relies on Glycyrrhiza Glabra Root Extract, Calendula Officinalis Flower Extract, and Niacinamide. Both approaches have merit, but the positioning and supporting ingredients make the difference.
Best for your skin type
Kiehl's Retinol Skin-Renewing Daily Micro-Dose Serum 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
Rejuran Dual Effect Ampoule In Mask Firming & Radiance is better if you have
- Sensitive skin — the low-irritation formula keeps things gentle
- Dry or dehydrated skin that craves moisture, thanks to Aloe Barbadensis Leaf Juice
- Anyone who prefers clean, well-vetted formulations
Value comparison
At premium pricing with a score of 8.9, Kiehl's Retinol Skin-Renewing Daily Micro-Dose Serum delivers strong value. Rejuran Dual Effect Ampoule In Mask Firming & Radiance sits at the mid-range level with a 8.4 score — the extra cost doesn't translate to better scores here.
Our verdict
Kiehl's Retinol Skin-Renewing Daily Micro-Dose Serum edges ahead with a slightly stronger formulation, but Rejuran Dual Effect Ampoule In Mask Firming & Radiance is still a solid pick.
Frequently asked questions
Which is better: Kiehl's Retinol Skin-Renewing Daily Micro-Dose Serum or Rejuran Dual Effect Ampoule In Mask Firming & Radiance?
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.
Do Kiehl's Retinol Skin-Renewing Daily Micro-Dose Serum and Rejuran Dual Effect Ampoule In Mask Firming & Radiance 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 Retinol Skin-Renewing Daily Micro-Dose Serum and Rejuran Dual Effect Ampoule In Mask Firming & Radiance?
The key differences are in their active ingredients and formulation approach. Check the attribute battle above for a detailed breakdown.