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Kiehl's Retinol Skin-Renewing Daily Micro-Dose Serum scores 9.0/9.8 vs Trader Joe's Hair Serum at 6.4/9.8. Kiehl's Retinol Skin-Renewing Daily Micro-Dose Serum wins for active ingredients.
Kiehl's Retinol Skin-Renewing Daily Micro-Dose Serum takes this one, winning 4 of 5 attributes.
Scores last verified: April 2026
41 unique
Where Kiehl's Retinol Skin-Renewing Daily Micro-Dose Serum really shines is active ingredient strength, scoring 7.8 compared to Trader Joe's Hair Serum's 2.1. 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 5.1 for Trader Joe's Hair 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 trader Joe's Hair Serum relies on Rubus Fruticosus (Blackberry) Fruit Extract, Euterpe Oleracea (Acai) Fruit Extract, and Helianthus Annuus (Sunflower) Seed Extract. 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
Trader Joe's Hair Serum is better if you have
Kiehl's Retinol Skin-Renewing Daily Micro-Dose Serum comes in at premium pricing with a 9.0 score, which is solid value at that tier.
Kiehl's Retinol Skin-Renewing Daily Micro-Dose Serum wins this comparison with a meaningfully stronger ingredient profile and overall score.
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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