Peter Thomas Roth Potent-C Niacinamide Discoloration Treatment, 15% Brightening Complex for Dark Spots

This lightweight gel-cream combines a multi-ingredient brightening blend with a stable form of Vitamin C to visibly even skin tone and restore radiance. Formulated to address pigmentation from sun exposure, aging and acne, it layers comfortably under moisturizers and makeup. The texture absorbs quickly and is designed for targeted use where dark spots and uneven tone appear.

How does this treatment work to reduce dark spots?

The formula uses multiple complementary actives that interrupt pigment formation and promote a brighter-looking complexion. Niacinamide calms and evens tone while tranexamic acid and kojic acid help reduce visible discoloration. Alpha arbutin and pentapeptide support a more uniform surface appearance, and THD ascorbate delivers antioxidant brightening benefits in a stable form.

• 15% Brightening Complex: niacinamide, tranexamic acid, kojic acid, alpha arbutin, pentapeptide.
• THD ascorbate Vitamin C for enhanced stability and brightness.
• Gel-cream texture absorbs rapidly for layered skincare routines.

When should I use it in my skincare routine?

Use this treatment after cleansing and any lightweight serums, and before heavier moisturizers or sunscreen in the morning and evening. In the morning, follow with a broad-spectrum sunscreen to protect treated areas from further sun-induced discoloration. For nighttime use, pair with your usual hydrator to support skin renewal while you sleep.

• Apply to clean, dry skin as a spot treatment or all-over brightening step.
• In AM, always follow with SPF 30+ to prevent new pigmentation.
• Layer under moisturizer and makeup without pilling.

Is this suitable for my skin type and post-acne marks?

The lightweight gel-cream formula suits combination to oily and normal skin types, and can be used on areas with post-acne marks to reduce the appearance of dark spots. Those with very dry or reactive skin should patch-test first and introduce the product gradually. Avoid use on broken or inflamed skin and discontinue if irritation occurs.

• Works well for combination, oily and normal skin textures.
• Can help lessen the visibility of post-acne hyperpigmentation.
• Patch-test recommended for sensitive or reactive skin.

How long until I see results?

Visible improvements in tone and clarity typically appear with consistent use over several weeks, though timelines vary by individual and the severity of discoloration. Many users report progressive fading of dark spots and a more even-looking complexion after consistent twice-daily application. Continual sun protection helps maintain results and prevent recurrence.

• Regular twice-daily application encourages gradual brightening.
• Visible changes commonly take a few weeks to appear.
• Daily sunscreen use helps preserve improvements.

Who is this for: Peter Thomas Roth Potent-C Niacinamide Discoloration Treatment is aimed at people seeking a potent over-the-counter brightening step for uneven tone, sun spots, and post-acne marks who prefer a non-greasy gel-cream. It's a good fit for adults with combination to oily skin types who want a multi-ingredient approach combining niacinamide, tranexamic acid, kojic acid, alpha arbutin, pentapeptide and stable Vitamin C to help even skin tone. If you have sensitive skin, introduce it slowly and patch-test first.

Ingredients

Water/Aqua/Eau, 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 (Shea) Butter, Tetrahexyldecyl Ascorbate, Kojic Acid, Resveratrol, Tocopheryl Acetate, Diethylhexyl Syringylidenemalonate, Hydrangea Arborescens Root Extract, Morus Alba Root Extract, Scutellaria Lateriflora Extract, Hydrolyzed Vegetable 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.