Jack Black Protein Booster Skin Serum vs Kiehl's Retinol Skin-Renewing Daily Micro-Dose Serum
Kiehl's Retinol Skin-Renewing Daily Micro-Dose Serum scores 8.9/9.8 vs Jack Black Protein Booster Skin Serum at 8.5/9.8. Kiehl's Retinol Skin-Renewing Daily Micro-Dose Serum wins for active ingredients.
Head to head
Protein Booster Skin Serum
Retinol Skin-Renewing Daily Micro-Dose Serum
Score comparison
Kiehl's Retinol Skin-Renewing Daily Micro-Dose Serum edges ahead, winning 2 of 5 attributes.
Scores last verified: July 2026
Attribute battle
Hydration Efficacy
Kiehl's WINSIrritation Risk
TIEActive Ingredient Strength
Kiehl's WINSIngredient Transparency
TIEFormulation Safety
TIEIngredient face-off
17% overlapOnly in Jack Black Protein Booster Skin Serum
22 unique
Shared ingredients
7 in common
Only in Kiehl's Retinol Skin-Renewing Daily Micro-Dose Serum
35 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 Jack Black Protein Booster Skin Serum's 5.3. Its formula features Niacinamide, Acetyl Dipeptide-1 Cetyl Ester, and Adenosine in high positions, signalling meaningful concentrations.
Hydration Efficacy is another area of separation. Kiehl's Retinol Skin-Renewing Daily Micro-Dose Serum scores 9.6 here versus 7.8 for Jack Black Protein Booster Skin Serum. That difference comes down to how each formula is built — the ingredient list tells the story.
Kiehl's Retinol Skin-Renewing Daily Micro-Dose Serum brings Niacinamide, Acetyl Dipeptide-1 Cetyl Ester, and Adenosine as actives, while jack Black Protein Booster Skin Serum relies on Camellia Sinensis Leaf Extract, Dipeptide Diaminobutyroyl Benzylamide Diacetate, and Retinyl Palmitate. Both approaches have merit, but the positioning and supporting ingredients make the difference.
Best for your skin type
Jack Black Protein Booster Skin 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
- Anyone who prefers clean, well-vetted formulations
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
Value comparison
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 8.9 overall score — you're getting more for a similar outlay.
Our verdict
Kiehl's Retinol Skin-Renewing Daily Micro-Dose Serum edges ahead with a slightly stronger formulation, but Jack Black Protein Booster Skin Serum is still a solid pick.
Frequently asked questions
Which is better: Jack Black Protein Booster Skin Serum or Kiehl's Retinol Skin-Renewing Daily Micro-Dose Serum?
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 Jack Black Protein Booster Skin Serum and Kiehl's Retinol Skin-Renewing Daily Micro-Dose 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 Jack Black Protein Booster Skin Serum and Kiehl's Retinol Skin-Renewing Daily Micro-Dose Serum?
The key differences are in their active ingredients and formulation approach. Check the attribute battle above for a detailed breakdown.