# Kiehl's Powerful-Strength Line-Reducing Concentrate for combination skin

**Lovi Fit: High fit for combination skin.**
Combination Skin Fit: High · Effectiveness: High · Safety: Excellent.

Page: https://lovi.care/skincare/it/p/kiehl-s/powerful-strength-line-reducing-concentrate/for/combination-skin

The Lovi Fit is the same in every country; only the stores and prices differ, and the ones here are for Italy.

Brand: [Kiehl's](https://lovi.care/skincare/it/brands/kiehl-s)
Category: [Serums and treatments](https://lovi.care/skincare/it/best/serums)

This fit is calculated for the concerns frequently associated with combination skin: an oily T-zone, enlarged pores, and dry cheeks. For scores based on a full skin profile (12D face scan, goals, preferences), use the Lovi app.

A great choice for combination skin; a few serums fit it even better.

## Why this fit

- Offers high wrinkle reduction for you, as ascorbic acid and adenosine visibly minimize fine lines and wrinkles, while Ascorbic Acid and Glycerin balance your combination skin by providing antioxidant activity and humectant action.
- The formula also addresses oily shine with Ascorbic Acid and Ascorbyl Glucoside, which offer antioxidant and brightening effects.
- This product is safe for your combination skin, with no risks of irritation due to the absence of harsh ingredients and the presence of soothing components like Ascorbyl Glucoside and Hydrolyzed Hyaluronic Acid.

## Fit by skin type

- [Oily skin](https://lovi.care/skincare/it/p/kiehl-s/powerful-strength-line-reducing-concentrate/for/oily-skin): Average
- [Dry skin](https://lovi.care/skincare/it/p/kiehl-s/powerful-strength-line-reducing-concentrate/for/dry-skin): Average
- [Combination skin](https://lovi.care/skincare/it/p/kiehl-s/powerful-strength-line-reducing-concentrate/for/combination-skin): High (this page)
- [Sensitive skin](https://lovi.care/skincare/it/p/kiehl-s/powerful-strength-line-reducing-concentrate/for/sensitive-skin): Average
- [Acne-prone skin](https://lovi.care/skincare/it/p/kiehl-s/powerful-strength-line-reducing-concentrate/for/acne-prone-skin): High
- [Skin with dark spots](https://lovi.care/skincare/it/p/kiehl-s/powerful-strength-line-reducing-concentrate/for/dark-spots): High
- [Mature skin](https://lovi.care/skincare/it/p/kiehl-s/powerful-strength-line-reducing-concentrate/for/mature-skin): Average
- [Dry sensitive skin](https://lovi.care/skincare/it/p/kiehl-s/powerful-strength-line-reducing-concentrate/for/dry-sensitive-skin): High
- [Oily acne-prone skin](https://lovi.care/skincare/it/p/kiehl-s/powerful-strength-line-reducing-concentrate/for/oily-acne-prone-skin): High

## Key ingredients

Ascorbic Acid, Sodium Hyaluronate, Ascorbyl Glucoside, Glycerin, Adenosine

## What the research says

- A topical serum containing vitamin C, vitamin E, and raspberry leaf cell culture extract improved skin color, elasticity, radiance, smoothness, scaliness, and wrinkles compared to the untreated contralateral side in fifty female volunteers. ([Journal of Cosmetic Dermatology, 2020](https://pubmed.ncbi.nlm.nih.gov/31975502/))
- Adenosine-loaded dissolving microneedle patches showed similar or better efficacy on skin wrinkles, dermal density, elasticity, and hydration compared to adenosine cream in 22 female subjects. ([International Journal of Cosmetic Science, 2018](https://pubmed.ncbi.nlm.nih.gov/29574973/))
- Horse oil-spread and adenosine-loaded dissolving microneedle patches significantly improved skin elasticity, hydration, dermal density, and wrinkles compared with adenosine-loaded dissolving microneedle patches in 20 women without causing adverse events. ([Journal of Cosmetic Dermatology, 2019](https://pubmed.ncbi.nlm.nih.gov/30160014/))
- Treatment with ascorbyl glucoside-arginine complex lotion significantly decreased pigmentation scores and melanin index while increasing lightness in solar lentigos of Japanese females compared to placebo over 24 weeks. ([International Journal of Molecular Sciences, 2024](https://pubmed.ncbi.nlm.nih.gov/39769217/))
- Topical application of 5% vitamin C cream significantly improved global clinical scores, increased skin microrelief density, and induced elastic tissue repair in photoaged skin compared to excipient control in healthy female volunteers. ([Experimental Dermatology, 2003](https://pubmed.ncbi.nlm.nih.gov/12823436/))
- Ascorbic acid 2-glucoside gel significantly reduced gingival melanin pigmentation after 4 weeks compared to placebo in 73 subjects with symmetric pigmentation. ([Journal of Periodontology, 2009](https://pubmed.ncbi.nlm.nih.gov/19186973/))
- Topical application of VC-IP cream twice daily for 8 weeks reduces periorbital wrinkles in female subjects compared to a placebo cream. ([Journal of Cosmetic Dermatology, 2022](https://pubmed.ncbi.nlm.nih.gov/34910367/))
- 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](https://pubmed.ncbi.nlm.nih.gov/22052267/))
- 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](https://pubmed.ncbi.nlm.nih.gov/34623507/))
- 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](https://pubmed.ncbi.nlm.nih.gov/31311529/))
- 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](https://pubmed.ncbi.nlm.nih.gov/28860834/))
- 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](https://pubmed.ncbi.nlm.nih.gov/31532576/))
- 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](https://pubmed.ncbi.nlm.nih.gov/18498456/))
- 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](https://pubmed.ncbi.nlm.nih.gov/19239555/))
- 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](https://pubmed.ncbi.nlm.nih.gov/42278371/))
- 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](https://pubmed.ncbi.nlm.nih.gov/34070360/))

## What reviewers say

Based on a very large amount of data, users frequently praise this serum for its high concentration of Vitamin C and Hyaluronic Acid, noting that it visibly brightens dull complexions and smooths skin texture almost immediately. While many appreciate the unique warming sensation and velvety finish, results on deep wrinkles vary, and the silicone-heavy formula can be polarizing for those with oily or acne-prone skin.

- Liked: Smoother skin (mostly mentioned)
- Liked: Visible brightening (often mentioned)
- Liked: Warming sensation (often mentioned)
- Liked: Fine line reduction (sometimes noted)
- Disliked: Greasy residue (sometimes noted)
- Disliked: Pills under makeup (sometimes noted)
- Disliked: Causes breakouts (rarely noted)
- Disliked: Unpleasant scent (rarely noted)

## How to apply

- Use your serum as part of your PM routine. Start using it 3 times a week and move to daily use if your skin likes it.
- Apply the serum after cleansing and toner, and right before your moisturizer.
- Gently press 2-3 drops of the serum into your skin and wait a minute ⏳for it to soak in.
- Apply the serum on clean and dry skin since your skin is not sensitive.
- Always do a patch test before using the serum for the first time, and avoid the eye area .
- Video: https://storage.pora.ai/c879dda8655a61c19d3d8c9ebad6b06d.mp4

## Questions and answers

### What makes Kiehl's Powerful-Strength Line-Reducing Concentrate a great fit for combination skin?

This product is a great fit because ascorbic acid and adenosine help smooth out fine lines while keeping your combination skin balanced. It also helps manage oily shine and is unlikely to cause irritation thanks to its soothing components.
Sources: [Journal of Cosmetic Dermatology, 2020](https://pubmed.ncbi.nlm.nih.gov/31975502/), [International Journal of Cosmetic Science, 2018](https://pubmed.ncbi.nlm.nih.gov/29574973/)

### Which ingredients make this serum a good fit for combination skin?

Ascorbic acid and adenosine make this serum a great fit by smoothing out fine lines, while glycerin keeps your skin soft and balanced. Ascorbic acid and ascorbyl glucoside also help manage oily shine and brighten your complexion without causing irritation.
Sources: [Journal of Cosmetic Dermatology, 2020](https://pubmed.ncbi.nlm.nih.gov/31975502/), [International Journal of Cosmetic Science, 2018](https://pubmed.ncbi.nlm.nih.gov/29574973/)

### What does Vitamin C do for combination skin?

Vitamin C helps brighten dull areas and smooth out uneven texture on combination skin while protecting against daily environmental stress. It may also help keep pores clear and skin firm by supporting collagen production, though drier spots may need an added moisturizer to stay comfortable.
Sources: [Journal of Cosmetic Dermatology, 2020](https://pubmed.ncbi.nlm.nih.gov/31975502/), [Journal of Cosmetic Dermatology, 2023](https://pubmed.ncbi.nlm.nih.gov/37128827/)

### What does Hyaluronic Acid do for combination skin?

Hyaluronic acid is a great fit for combination skin because it quenches dry areas with a boost of hydration while keeping oily zones balanced. Regular use helps smooth out fine lines and makes your skin feel soft and plump without causing irritation.
Sources: [Dermatology and Therapy, 2021](https://pubmed.ncbi.nlm.nih.gov/34176098/), [Journal of Drugs in Dermatology, 2011](https://pubmed.ncbi.nlm.nih.gov/22052267/)

### Where does this serum go in a skincare routine for combination skin?

This treatment goes in the evening routine after cleansing and before moisturizing, though some treatments may also be used in the morning or twice a day. Putting it in the evening offers extra safety around sun exposure and keeps your routine simple.

### Can I use this serum with retinol, and in what order?

You can use this serum with retinol, but it is best to apply them on alternate nights or use one in the morning and the other at night to prevent irritation. Since both ingredients are quite active, separating them helps keep your skin calm while smoothing fine lines and managing shine.
Sources: [Journal of Cosmetic Dermatology, 2020](https://pubmed.ncbi.nlm.nih.gov/31975502/), [International Journal of Cosmetic Science, 2018](https://pubmed.ncbi.nlm.nih.gov/29574973/)

### How often should I use this serum?

This treatment is applied in the evening as part of your routine, or it may be used in the morning or twice a day depending on your preference. Antioxidants like vitamin C serve as a low-risk mainstay intervention that helps brighten and smooth combination skin while minimizing fine lines.
Sources: [Facial Plastic Surgery, 2014](https://pubmed.ncbi.nlm.nih.gov/24488631/), [Journal of Cosmetic Dermatology, 2020](https://pubmed.ncbi.nlm.nih.gov/31975502/)

### Can this serum clog pores, cause breakouts or purging for combination skin?

This serum is unlikely to cause breakouts for combination skin, as it has a low complaint rate for causing blemishes and lacks harsh ingredients that typically trigger irritation. It helps keep skin smooth and balanced without clogging pores.

### Is this serum fragrance-free and alcohol-free?

It has no drying alcohol and contains fragrance (limonene and citral).

## Alternatives for combination skin

- [Neogen Dermalogy Real Niacinamide 15% Firming Serum](https://lovi.care/skincare/it/p/neogen-dermalogy/real-niacinamide-15-firming-serum/for/combination-skin) — Superior fit — €37.99 at Amazon
- [Augustinus Bader The Serum](https://lovi.care/skincare/it/p/augustinus-bader/the-serum/for/combination-skin) — Superior fit — €380.10 at Amazon
- [SkinCeuticals C E Ferulic](https://lovi.care/skincare/it/p/skinceuticals/c-e-ferulic/for/combination-skin) — Superior fit — €129.99 at Amazon

## Pairs well with

- Cleanser: [Dr. Althea Amino Acid Gentle Bubble Cleanser](https://lovi.care/skincare/it/p/dr-althea/amino-acid-gentle-bubble-cleanser/for/combination-skin) — Superior fit — €13.50 at Amazon
- Hydrating Toner: [La Mer The Tonic](https://lovi.care/skincare/it/p/la-mer/the-tonic/for/combination-skin) — Superior fit — €103.91 at Amazon
- Moisturizer: [COSRX Oil-Free Ultra-Moisturizing Lotion with Birch Sap](https://lovi.care/skincare/it/p/cosrx/oil-free-ultra-moisturizing-lotion-with-birch-sap/for/combination-skin) — Superior fit — €18.47 at Amazon

## Where to buy

- Amazon.it: €56.06 (https://www.amazon.it/dp/B078Y96B22?tag=lovi-care-web-product09-21&linkCode=osi&th=1&psc=1)
- Lookfantastic: €74.75 (https://www.lookfantastic.it/p/kiehl-s-powerful-strength-line-reducing-concentrate-various-sizes/12916140/)
Prices checked 17 Oct – 5 Nov 2026.

## Ingredients

Propylene Glycol, Dimethicone, Glycerin, Ascorbic Acid, Ethylhexyl Palmitate, Cetyl Peg Ppg-10 1 Dimethicone, Dimethicone Crosspolymer, Ascorbyl Glucoside, Cyclohexasiloxane, Hydroxyethylpiperazine Ethane Sulfonic Acid, Lauroyl Lysine, Acrylonitrile Methyl Methacrylate Vinylidene Chloride Copolymer, Polysilicone-11, Adenosine, Hydrolyzed Hyaluronic Acid, Limonene, Isobutane, Citrus Aurantium Dulcis Peel Oil, Citrus Limon Lemon Peel Oil, Citral, Pentaerythrityl Tetra-Di-T-Butyl Hydroxyhydrocinnamate
## About the Lovi Fit

Lovi: Unbiased, science-based skincare AI trained on real user outcomes.

Lovi calculates every fit score from the full ingredient list with brand-independent rules its 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. Levels from best to worst: Superior, High, Average, Low, Caution, Warning.

Behind this fit score: Nadia Kapleva, MS (Co-founder, Medical Director); Alexey Shagraev, PhD (Co-founder, CEO and CTO); Dr. Sofía Perea Pérez, MD, MSc (Medical Board); Aishani Shah, MD (Medical Board); Asya Zubkova, MS (Medical Board); Hanna Kurets, MD (Medical Board, Medical Advisor); Elina Nazarenko, MD (Medical Board); Victoria Derkova, MS (Medical Board).

Page built Nov 8, 2026.

More from Lovi: https://lovi.care/skincare/llms.txt

## This page in other countries

- United States: https://lovi.care/skincare/p/kiehl-s/powerful-strength-line-reducing-concentrate/for/combination-skin
- United Kingdom: https://lovi.care/skincare/uk/p/kiehl-s/powerful-strength-line-reducing-concentrate/for/combination-skin
- Ireland: https://lovi.care/skincare/ie/p/kiehl-s/powerful-strength-line-reducing-concentrate/for/combination-skin
- Germany: https://lovi.care/skincare/de/p/kiehl-s/powerful-strength-line-reducing-concentrate/for/combination-skin
- France: https://lovi.care/skincare/fr/p/kiehl-s/powerful-strength-line-reducing-concentrate/for/combination-skin
- Italy: https://lovi.care/skincare/it/p/kiehl-s/powerful-strength-line-reducing-concentrate/for/combination-skin (this page)
- Netherlands: https://lovi.care/skincare/nl/p/kiehl-s/powerful-strength-line-reducing-concentrate/for/combination-skin
- Spain: https://lovi.care/skincare/es/p/kiehl-s/powerful-strength-line-reducing-concentrate/for/combination-skin
- Canada: https://lovi.care/skincare/ca/p/kiehl-s/powerful-strength-line-reducing-concentrate/for/combination-skin
- Australia: https://lovi.care/skincare/au/p/kiehl-s/powerful-strength-line-reducing-concentrate/for/combination-skin
- Singapore: https://lovi.care/skincare/sg/p/kiehl-s/powerful-strength-line-reducing-concentrate/for/combination-skin
- Saudi Arabia: https://lovi.care/skincare/sa/p/kiehl-s/powerful-strength-line-reducing-concentrate/for/combination-skin
- United Arab Emirates: https://lovi.care/skincare/ae/p/kiehl-s/powerful-strength-line-reducing-concentrate/for/combination-skin