Kiehl's Iris Extract Activating Treatment Essence for skin with dark spots

How to apply

Questions and answers

What the research says

• Capryloyl salicylic acid peel reduced fine lines, wrinkles, and hyperpigmentation comparably to glycolic acid peel in 44 female volunteers, with no statistically significant differences between the two treatments.

  Journal of Cosmetic Dermatology, 2008

• A single application of a moisturizing fluid containing hyaluronic acid 1%, glycerin 5%, and Centella asiatica stem cells extract significantly increased skin hydration by 29% and reduced transepidermal water loss at 24 hours compared to baseline and an untreated control site in twenty healthy women.

  Clinical, Cosmetic and Investigational Dermatology, 2017

• Iris pallida extract alleviated the cortisol-induced decrease in procollagen type 1 and hyaluronic acid levels by 106% and 31%, respectively, and blocked glucocorticoid receptor nuclear translocation in human skin cells.

  Current Issues in Molecular Biology, 2023

• Phytochemicals from Iris florentina rhizome extract exhibited dual modulatory effects, where germanaism B stimulated melanogenesis while iriflorental and iripallidal inhibited it, enabling targeted management of pigmentation disorders.

  Molecules, 2025

• Combining a salicylic acid and lipohydroxy acid facial serum and mask improved closed comedones and acne severity significantly more than serum alone in adults with acne over 8 weeks, with no adverse reactions reported.

  Journal of Cosmetic Dermatology, 2023

• Parity was demonstrated between an OTC BPO 5.5% formulation with lipohydroxy acid and tretinoin cream 0.025% versus prescription clindamycin 1%-BPO 5% gel and tretinoin cream 0.025% in participants with mild to moderate acne vulgaris at 12 weeks.

  Cutis, 2012

• Daily use of a deep cleansing gel containing salicylic acid 2%, zinc gluconate 0.2% and lipohydroxy acid 0.05% significantly reduced total lesion count by 56.3% after 84 days in 35 subjects with mild to moderate truncal acne.

  Clinical, Cosmetic and Investigational Dermatology, 2023

• Topical application of 0.1% hyaluronic acid formulations of different molecular weights led to significant improvements in skin hydration and elasticity, with low-molecular-weight formulations also significantly reducing wrinkle depth in seventy-six female subjects compared to a vehicle control.

  Journal of Drugs in Dermatology, 2011

• Topical application of hyaluronic acid in conjunction with free gingival graft significantly reduced donor site postoperative pain until day 7 compared to normal saline, with no significant differences in graft dimensions or patient satisfaction.

  Clinical Oral Investigations, 2022

• Treatment with a hyaluronic acid-containing mouth rinse or topical gel led to significant lesion reduction, pain relief, and normalization of lesion color in adult patients with minor recurrent aphthous stomatitis, with the gel formulation showing an earlier healing onset at 3 days.

  BMC Oral Health, 2019

• The emollient V0034CR significantly reduced TEWL compared to vehicle and vehicle plus glycerol, and significantly increased corneometry scores compared to vehicle and vehicle plus petrolatum in healthy volunteers with dry skin, demonstrating combined barrier function improvement from petrolatum and hydration improvement from glycerol.

  Journal of Cosmetic Dermatology, 2020

• Ten days of treatment with a cream containing 20% glycerin significantly increased skin hydration measured by corneometer values in 17 healthy volunteers compared to a placebo cream, but showed no influence on transepidermal water loss or skin sensitivity to an irritating surfactant.

  International Journal of Cosmetic Science, 2001

• Niacinamide/glycerin body moisturizers provided better rapid and prolonged improvement of cosmetic xerosis through functional improvement of stratum corneum barrier function compared to no treatment and conventional moisturizers in female subjects.

  Journal of Drugs in Dermatology, 2012

• Topical adenosine treatment significantly increased the anagen hair growth rate and thick hair rate compared to placebo in Japanese women with female pattern hair loss over 12 months.

  The Journal of Dermatology, 2008

• Topical application of a disodium adenosine monophosphate-based formulation reduced wrinkles and hyperpigmentation while improving hydration, barrier function, skin lifting, and epidermal turnover in female participants.

  International Journal of Molecular Sciences, 2026

• Adenosine and cordycepin stimulate the Wnt/beta-catenin signaling pathway through adenosine receptor and PKA activation, promoting cell proliferation, migration, and growth factor secretion in cultured dermal fibroblasts.

  International Journal of Molecular Sciences, 2021

Ingredients

Water, Butylene Glycol, Glycerin, Dipropylene Glycol, Alcohol Denat, Methyl Gluceth-10, Phenoxyethanol, Ppg-6-Decyltetradeceth-30, Chlorphenesin, Parfum, Capryloyl Salicylic Acid, Tetrasodium Edta, Iris Florentina, Iris Florentina Root Extract, Sodium Hyaluronate, Xanthan Gum, Citric Acid, Sodium Citrate, Adenosine, Limonene

Behind this fit score

Lovi calculates every fit score from the full ingredient list with brand-independent rules our dermatologists and cosmetic chemists build and review, and personalizes every pick with AI trained on the real results of millions of users. Lovi trains its fit score models on a proprietary dataset built from more than 10,000 expert-labeled products and more than 100,000 simulated examples, following an internally consistent methodology presented at Cosmoprof, AMWC, and Skin of Color Update.