# Peter Thomas Roth Potent-C Niacinamide Discoloration Treatment for combination skin

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

Page: https://lovi.care/skincare/p/peter-thomas-roth/potent-c-niacinamide-discoloration-treatment/for/combination-skin

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

Brand: [Peter Thomas Roth](https://lovi.care/skincare/brands/peter-thomas-roth)
Category: [Serums and treatments](https://lovi.care/skincare/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 excellent brightening and evening of skin tone for your combination skin due to niacinamide and alpha arbutin, which regulate melanogenesis and repair the skin barrier.
- The formula also provides moderate benefits for oily shine by helping to control oil production with niacinamide and tranexamic acid.
- The safety profile is excellent, with no risks of irritation for your combination skin due to the absence of prohibited or harsh ingredients.

## Fit by skin type

- [Oily skin](https://lovi.care/skincare/p/peter-thomas-roth/potent-c-niacinamide-discoloration-treatment/for/oily-skin): Average
- [Dry skin](https://lovi.care/skincare/p/peter-thomas-roth/potent-c-niacinamide-discoloration-treatment/for/dry-skin): Superior
- [Combination skin](https://lovi.care/skincare/p/peter-thomas-roth/potent-c-niacinamide-discoloration-treatment/for/combination-skin): High (this page)
- [Sensitive skin](https://lovi.care/skincare/p/peter-thomas-roth/potent-c-niacinamide-discoloration-treatment/for/sensitive-skin): High
- [Acne-prone skin](https://lovi.care/skincare/p/peter-thomas-roth/potent-c-niacinamide-discoloration-treatment/for/acne-prone-skin): High
- [Skin with dark spots](https://lovi.care/skincare/p/peter-thomas-roth/potent-c-niacinamide-discoloration-treatment/for/dark-spots): Superior
- [Mature skin](https://lovi.care/skincare/p/peter-thomas-roth/potent-c-niacinamide-discoloration-treatment/for/mature-skin): High
- [Dry sensitive skin](https://lovi.care/skincare/p/peter-thomas-roth/potent-c-niacinamide-discoloration-treatment/for/dry-sensitive-skin): High
- [Oily acne-prone skin](https://lovi.care/skincare/p/peter-thomas-roth/potent-c-niacinamide-discoloration-treatment/for/oily-acne-prone-skin): High

## Key ingredients

Niacinamide, Tetrahexyldecyl Ascorbate, Tranexamic Acid, Alpha Arbutin, Kojic Acid

## What the research says

- Niacinamide significantly decreased hyperpigmentation and increased skin lightness compared with vehicle alone after 4 weeks of use in women by inhibiting melanosome transfer. ([The British Journal of Dermatology, 2002](https://pubmed.ncbi.nlm.nih.gov/12100180/))
- Encapsulation of alpha arbutin in an optimized ethosomal gel significantly improved skin melanin reduction, moisture content, and elasticity in human volunteers compared to conventional formulations. ([Heliyon, 2023](https://pubmed.ncbi.nlm.nih.gov/37681127/))
- Topical post-laser application of human adipocyte-derived mesenchymal stem cell media combined with niacinamide significantly improved wrinkle index, melanin index, patient satisfaction, and investigator esthetic improvement scores compared to vehicle cream in patients with aging skin. ([Journal of Cosmetic Dermatology, 2021](https://pubmed.ncbi.nlm.nih.gov/33103316/))
- Topical nicotinamide prevented solar-simulated UV-induced immunosuppression in healthy volunteers, and men experienced immunosuppression at solar-simulated UV doses three times lower than those required for women. ([The Journal of Investigative Dermatology, 2008](https://pubmed.ncbi.nlm.nih.gov/17882270/))
- Topical 5% niacinamide applied twice daily for 12 weeks reduced fine lines and wrinkles, hyperpigmented spots, red blotchiness, and skin sallowness, and improved skin elasticity compared to vehicle control in 50 female white subjects with facial photoaging. ([Dermatologic Surgery, 2005](https://pubmed.ncbi.nlm.nih.gov/16029679/))
- 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/))
- A non-hydroquinone topical formulation (SKNB19) improved hyperpigmentation by 28.5% in patient self-assessment and 27% in independent reviewer assessment compared with 4% hydroquinone in 18 adult subjects, while showing significantly less irritation and better tolerability. ([Journal of Cosmetic Science, 2020](https://pubmed.ncbi.nlm.nih.gov/33022197/))
- Combining a home-based radiofrequency device and arbutin cream reduced mMASI scores by 25.6% and melanin index by 22.8% at 8 weeks compared to baseline in 38 participants. ([Journal of Cosmetic Dermatology, 2025](https://pubmed.ncbi.nlm.nih.gov/39918262/))
- Polyvinyl pyrrolidone-K90/Eudragit RL100 dissolving microneedle patches loaded with alpha-arbutin and resveratrol enhanced intradermal delivery by approximately 2.6 times compared to cream and slightly decreased the melanin index in human participants without causing skin irritation. ([Biomaterials Science, 2023](https://pubmed.ncbi.nlm.nih.gov/37183632/))
- A topical formulation containing kojic acid, emblica extract, and glycolic acid demonstrated efficacy parity compared with hydroquinone 4% in multiethnic participants with mild to moderate facial dyschromia. ([Cutis, 2010](https://pubmed.ncbi.nlm.nih.gov/21049734/))
- A nanoemulsion containing 1 mg/mL kojic dipalmitate and 5% rosehip oil demonstrated high incorporation efficiency, suitable physicochemical stability, antioxidant and depigmenting efficacy close to 1 mM ascorbic acid, and no cytotoxicity at concentrations from 0.06% to 1% in vitro. ([Pharmaceutics, 2023](https://pubmed.ncbi.nlm.nih.gov/36839792/))
- Topical application of iron chelators kojic acid and deferiprone significantly accelerated wound healing in rats compared to control groups, with deferiprone showing superior efficacy due to higher antioxidant and iron chelation abilities. ([International Wound Journal, 2013](https://pubmed.ncbi.nlm.nih.gov/22621771/))

## What reviewers say

Users consistently praise this treatment for its ability to visibly fade post-acne marks and brighten the overall complexion, often noting its lightweight and non-sticky texture. While many see rapid results with general hyperpigmentation, some users report it is less effective on stubborn conditions like melasma and note the high price point.

- Liked: Fades dark spots (mostly mentioned)
- Liked: Brightens complexion (often mentioned)
- Liked: Elegant texture (sometimes noted)
- Liked: Gentle formulation (sometimes noted)
- Disliked: High price point (sometimes noted)
- Disliked: Ineffective on melasma (rarely noted)
- Disliked: Potential breakouts (rarely noted)
- Disliked: Slow results (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 Peter Thomas Roth Potent-C Niacinamide Discoloration Treatment a great fit for combination skin?

This treatment is a great fit because niacinamide and alpha arbutin brighten dark spots and even out your skin tone while keeping oily shine under control. The formula also has a very safe profile, meaning it is unlikely to cause irritation on combination skin.
Sources: [The British Journal of Dermatology, 2002](https://pubmed.ncbi.nlm.nih.gov/12100180/), [Heliyon, 2023](https://pubmed.ncbi.nlm.nih.gov/37681127/)

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

This treatment is a great fit for combination skin because it features niacinamide and alpha arbutin, which help brighten dark spots and even out your skin tone. It also includes tranexamic acid and kojic acid to further target discoloration while keeping oily shine under control.
Sources: [The British Journal of Dermatology, 2002](https://pubmed.ncbi.nlm.nih.gov/12100180/), [Heliyon, 2023](https://pubmed.ncbi.nlm.nih.gov/37681127/)

### What does Niacinamide do for combination skin?

Niacinamide helps balance oily areas by reducing excess shine and pore size while keeping dry patches hydrated and smooth. It also works to calm redness and even out skin tone, making it very suitable for combination skin.
Sources: [The British Journal of Dermatology, 2002](https://pubmed.ncbi.nlm.nih.gov/12100180/), [Antioxidants, 2021](https://pubmed.ncbi.nlm.nih.gov/34439563/)

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

Vitamin C helps brighten combination skin, smooth out uneven texture, and protect against daily environmental stress while keeping it balanced. It may also improve hydration and reduce redness in areas that tend to be dry or irritated.
Sources: [Journal of Cosmetic Dermatology, 2024](https://pubmed.ncbi.nlm.nih.gov/38525606/), [Photochemistry and Photobiology, 2021](https://pubmed.ncbi.nlm.nih.gov/33529350/)

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

This treatment goes in your evening routine after cleansing and before moisturizing, and it may also be used once a week in your weekly routine. Placing treatments in the evening provides extra safety around sun exposure and keeps your daily steps simple.

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

You can use this treatment with retinol by applying the treatment first and following with your retinol on alternate nights to prevent irritation. This formula helps brighten your skin and control oil, and using both active ingredients carefully keeps your skin calm and smooth.

### How often should I use this treatment?

This treatment is applied in the evening as part of your routine. It is very safe and unlikely to cause irritation for your combination skin, allowing for consistent evening use.
Sources: [The British Journal of Dermatology, 2002](https://pubmed.ncbi.nlm.nih.gov/12100180/), [Heliyon, 2023](https://pubmed.ncbi.nlm.nih.gov/37681127/)

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

This treatment is unlikely to clog pores or cause breakouts for combination skin because it has a great safety profile with no harsh ingredients. However, a small number of reviewers report potential breakouts.

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

Yes, it has no fragrance and no drying alcohol. Cetyl alcohol is a fatty alcohol, which soften the skin.

## Alternatives for combination skin

- [Beauty of Joseon Propolis + Niacinamide Glow Serum](https://lovi.care/skincare/p/beauty-of-joseon/propolis-niacinamide-glow-serum/for/combination-skin) — Superior fit — $16.75 at Amazon
- [Neogen Dermalogy Real Niacinamide 15% Firming Serum](https://lovi.care/skincare/p/neogen-dermalogy/real-niacinamide-15-firming-serum/for/combination-skin) — Superior fit — $28.88 at Amazon
- [Augustinus Bader The Serum](https://lovi.care/skincare/p/augustinus-bader/the-serum/for/combination-skin) — Superior fit — $200.00 at Amazon

## Pairs well with

- Cleanser: [Fresh Soy Face Cleanser](https://lovi.care/skincare/p/fresh/soy-face-cleanser/for/combination-skin) — Superior fit — $28.08 at Amazon
- Hydrating Toner: [Paula's Choice Pore-Reducing Toner](https://lovi.care/skincare/p/paula-s-choice/skin-balancing-pore-reducing-toner/for/combination-skin) — Superior fit — $25.60 at Amazon
- Moisturizer: [COSRX Oil-Free Ultra-Moisturizing Lotion with Birch Sap](https://lovi.care/skincare/p/cosrx/oil-free-ultra-moisturizing-lotion-with-birch-sap/for/combination-skin) — Superior fit — $18.99 at Amazon

## Where to buy

No store in United States has a checked price for this product, so the page shows none.

## Ingredients

Water, Niacinamide, Dimethyl Isosorbide, Isononyl Isononanoate, Tranexamic Acid, Dimethicone, Caprylic Capric Triglyceride, Alpha Arbutin, Cetyl Alcohol, Glyceryl Stearate, Pentylene Glycol, Propanediol, C9-12 Alkane, Citric Acid, Glyceryl Stearate Se, Butyrospermum Parkii Butter Shea Butter, Tetrahexyldecyl Ascorbate, Kojic Acid, Resveratrol, Tocopheryl Acetate, Diethylhexyl Syringylidenemalonate, Hydrangea Arborescens Root Extract, Morus Alba Root Extract, Scutellaria Lateriflora Extract, Hydrolyzed Protein, Silica, Sodium Stearoyl Glutamate, Coco-Caprylate Caprate, Dimethiconol, Glycerin, Sodium Phytate, Potassium Sorbate, Sodium Benzoate, Caprylyl Glycol, Hexylene Glycol, Polysorbate 20, Ceteth-20, Steareth-20, Polyacrylate Crosspolymer-6, Peg-75 Stearate, Titanium Dioxide Ci 77891, Phenoxyethanol
## 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/peter-thomas-roth/potent-c-niacinamide-discoloration-treatment/for/combination-skin (this page)
- United Kingdom: https://lovi.care/skincare/uk/p/peter-thomas-roth/potent-c-niacinamide-discoloration-treatment/for/combination-skin
- Ireland: https://lovi.care/skincare/ie/p/peter-thomas-roth/potent-c-niacinamide-discoloration-treatment/for/combination-skin
- Germany: https://lovi.care/skincare/de/p/peter-thomas-roth/potent-c-niacinamide-discoloration-treatment/for/combination-skin
- France: https://lovi.care/skincare/fr/p/peter-thomas-roth/potent-c-niacinamide-discoloration-treatment/for/combination-skin
- Italy: https://lovi.care/skincare/it/p/peter-thomas-roth/potent-c-niacinamide-discoloration-treatment/for/combination-skin
- Netherlands: https://lovi.care/skincare/nl/p/peter-thomas-roth/potent-c-niacinamide-discoloration-treatment/for/combination-skin
- Spain: https://lovi.care/skincare/es/p/peter-thomas-roth/potent-c-niacinamide-discoloration-treatment/for/combination-skin
- Canada: https://lovi.care/skincare/ca/p/peter-thomas-roth/potent-c-niacinamide-discoloration-treatment/for/combination-skin
- Australia: https://lovi.care/skincare/au/p/peter-thomas-roth/potent-c-niacinamide-discoloration-treatment/for/combination-skin
- Singapore: https://lovi.care/skincare/sg/p/peter-thomas-roth/potent-c-niacinamide-discoloration-treatment/for/combination-skin
- Saudi Arabia: https://lovi.care/skincare/sa/p/peter-thomas-roth/potent-c-niacinamide-discoloration-treatment/for/combination-skin
- United Arab Emirates: https://lovi.care/skincare/ae/p/peter-thomas-roth/potent-c-niacinamide-discoloration-treatment/for/combination-skin