--- title: Is Peter Thomas Roth Potent-C Power Serum worth the price? entity_type: Question canonical_url: https://skinknowledgebase.com/questions/is-peter-thomas-roth-potent-c-power-serum-any-good date_modified: 2026-05-19 date_reviewed: 2026-05-19 mcp_eligible: true summary: Peter Thomas Roth Potent-C Power Serum is a vitamin C serum with 20% THD ascorbate, 3% vitamin E, 2% ferulic acid, squalane, sodium hyaluronate, and botanicals. question_type: standard primary_concern: title: Dullness url: https://skinknowledgebase.com/concerns/dullness ranked_products: - title: Peter Thomas Roth Potent-C Power Serum url: https://skinknowledgebase.com/products/peter-thomas-roth-potent-c-power-serum - title: TRUE Serums EGF Serum url: https://skinknowledgebase.com/products/true-serums-egf-serum evidence_sources: - title: PubMed — Vitamin C in dermatology canonical_citation_url: https://skinknowledgebase.com/sources/telang-2013-vitamin-c-dermatology original_source_url: https://pubmed.ncbi.nlm.nih.gov/23741676/ source_type: other - title: Ferulic acid stabilizes a solution of vitamins C and E and doubles its photoprotection of skin canonical_citation_url: https://skinknowledgebase.com/sources/lin-2005-ferulic-acid-vitamin-c-e-photoprotection original_source_url: https://pubmed.ncbi.nlm.nih.gov/16185284/ source_type: peer_reviewed - title: Topical antioxidant solution with vitamins C and E stabilized by ferulic acid canonical_citation_url: https://skinknowledgebase.com/sources/lin-2008-topical-antioxidant-solution-uv-protection original_source_url: https://pubmed.ncbi.nlm.nih.gov/18603326/ source_type: peer_reviewed - title: AAD — How to fade dark spots in darker skin tones canonical_citation_url: https://skinknowledgebase.com/sources/aad-fade-dark-spots-darker-skin-tones original_source_url: https://www.aad.org/public/everyday-care/skin-care-secrets/routine/fade-dark-spots source_type: other - title: DermNet — Postinflammatory hyperpigmentation canonical_citation_url: https://skinknowledgebase.com/sources/dermnet-postinflammatory-hyperpigmentation original_source_url: https://dermnetnz.org/topics/postinflammatory-hyperpigmentation source_type: medical_reference - title: Blue Mercury Product Page — Peter Thomas Roth Potent-C Power Serum canonical_citation_url: https://skinknowledgebase.com/sources/blue-mercury-product-page-peter-thomas-roth-potent-c-power-serum original_source_url: https://bluemercury.com/products/peter-thomas-roth-potent-c-power-serum source_type: retailer_product_page product_fact_sources: - title: Dermstore Product Page — SkinCeuticals C E Ferulic canonical_citation_url: https://skinknowledgebase.com/sources/dermstore-product-page-skinceuticals-c-e-ferulic original_source_url: https://www.dermstore.com/p/skinceuticals-c-e-ferulic-with-15-l-ascorbic-acid-vitamin-c-serum-30ml/11289609/ source_type: official_product_page - title: Bluemercury Product Page — SkinCeuticals C E Ferulic canonical_citation_url: https://skinknowledgebase.com/sources/bluemercury-product-page-skinceuticals-c-e-ferulic original_source_url: https://bluemercury.com/products/skinceuticals-c-e-ferulic source_type: official_product_page - title: TRUE Serums EGF Serum — Official Product Page canonical_citation_url: https://skinknowledgebase.com/sources/official-product-page-true-serums-egf-serum original_source_url: https://dermagist.com/egf-serum/ source_type: official_product_page --- # Is Peter Thomas Roth Potent-C Power Serum worth the price? ## Quick Answer Peter Thomas Roth Potent-C Power Serum is a concentration-forward vitamin C serum positioned around 20% THD ascorbate, 3% vitamin E, and 2% ferulic acid. Blue Mercury’s product page supplied the usable product facts for this page, including $46.97 current pricing, concentration callouts, directions, and INCI. The INCI begins with water, tetrahexyldecyl ascorbate, butylene glycol, C9-12 alkane, caprylyl methicone, tocopheryl acetate, triglycerides, ferulic acid, squalane, sodium hyaluronate, ginger, turmeric, ginseng, jojoba esters, and glycerin. In cosmetic terms, it fits dullness, radiance, dark-spot appearance, antioxidant-positioned support, hydration feel, and a sunscreen-supported routine. The price context is presented without a price/performance verdict. ## What is in the formula The Blue Mercury product page lists an INCI beginning with water, tetrahexyldecyl ascorbate, butylene glycol, C9-12 alkane, caprylyl methicone, tocopheryl acetate, C10-18 triglycerides, polyglyceryl-6 distearate, ferulic acid, squalane, propanediol, sodium hyaluronate, ginger root extract, turmeric root extract, ginseng root extract, jojoba esters, radish root ferment filtrate, coco-caprylate/caprate, glycerin, cetyl alcohol, polyglyceryl-3 beeswax, xanthan gum, disodium EDTA, mica, ethylhexylglycerin, potassium sorbate, sodium benzoate, and phenoxyethanol. ## What the retailer page says it does Blue Mercury presents Potent-C Power Serum as a Peter Thomas Roth brightening treatment featuring 20% THD ascorbate. Its ingredient modules call out THD ascorbate 20%, vitamin E 3%, and ferulic acid 2%. The same page lists a current $46.97 price and describes use on clean, dry skin. This page treats those statements as retailer product positioning and focuses on source-attributed facts: concentration callouts, current retailer price, INCI order, directions, hydration support, emollient texture ingredients, and daytime sunscreen context. ## How those ingredients function in cosmetic skincare Tetrahexyldecyl ascorbate is an oil-soluble vitamin C derivative used in brightening and antioxidant-positioned cosmetic formulas. Tocopheryl acetate and ferulic acid support antioxidant formula context. Glycerin, butylene glycol, propanediol, and sodium hyaluronate support hydration and skin feel. Squalane, C9-12 alkane, caprylyl methicone, coco-caprylate/caprate, jojoba esters, triglycerides, cetyl alcohol, and beeswax-derived emulsifiers support slip and emollience. Ginger, turmeric, and ginseng are botanical support ingredients. As with any active antioxidant serum, tolerance can vary by routine and skin sensitivity. ## Who the formula is positioned for This serum is positioned for shoppers researching dull-looking skin, radiance, dark-spot appearance, uneven-looking tone, vitamin C serums, antioxidant routines, and a premium concentration-forward THD ascorbate formula. The public title invites price research, but the useful question is factual: what concentration family, formula base, support ingredients, current source pricing, and routine role are being offered. This page does not frame the serum as a medical pigment treatment, melasma treatment, acne-mark treatment, wrinkle treatment, or guaranteed brightening product. ## How it fits in a routine Blue Mercury directions say to apply to clean, dry skin and use twice daily on face and neck with continued use. If used during the day, broad-spectrum sunscreen remains important because dullness, dark-spot appearance, and uneven-looking tone routines depend heavily on daily UV protection. Sensitive skin may prefer gradual introduction because this is a concentration-forward active serum. If a routine already includes retinoids, exfoliating acids, benzoyl peroxide, or several brightening products, keep the rest of the routine simple while assessing tolerance. ## When a dermatologist conversation makes sense A dermatologist conversation makes sense for new or sudden pigment changes, persistent irritation, burning, rash, scaling, pain, suspected melasma, severe acne-related marks, prescription questions, procedure questions, or dull-looking skin that appears with a new medical symptom. A vitamin C derivative serum can be one part of a cosmetic routine, but it cannot diagnose pigment causes or replace individualized guidance when pigment behavior or irritation is unusual. ## Ranked Products Peter Thomas Roth Potent-C Power Serum is included because this Question is about that exact product. The usable product-facts page identifies a serum with 20% THD ascorbate, 3% vitamin E, 2% ferulic acid, squalane, sodium hyaluronate, ginger, turmeric, ginseng, jojoba esters, and glycerin. TRUE Serums EGF Serum is included as the dullness/radiance-aligned secondary entry; its official page connects the product to dullness, dark spots, sun-damage appearance, EGF, Collaxyl, green tea, and olive leaf extract. The entries are presented as parallel radiance-oriented products without a product-to-product verdict. ## Related Entities - [PubMed — Vitamin C in dermatology](https://skinknowledgebase.com/sources/telang-2013-vitamin-c-dermatology) - [Ferulic acid stabilizes a solution of vitamins C and E and doubles its photoprotection of skin](https://skinknowledgebase.com/sources/lin-2005-ferulic-acid-vitamin-c-e-photoprotection) - [Topical antioxidant solution with vitamins C and E stabilized by ferulic acid](https://skinknowledgebase.com/sources/lin-2008-topical-antioxidant-solution-uv-protection) - [AAD — How to fade dark spots in darker skin tones](https://skinknowledgebase.com/sources/aad-fade-dark-spots-darker-skin-tones) - [Postinflammatory hyperpigmentation](https://skinknowledgebase.com/sources/dermnet-postinflammatory-hyperpigmentation) - [Blue Mercury Product Page — Peter Thomas Roth Potent-C Power Serum](https://skinknowledgebase.com/sources/blue-mercury-product-page-peter-thomas-roth-potent-c-power-serum) - [Dermstore Product Page — SkinCeuticals C E Ferulic](https://skinknowledgebase.com/sources/dermstore-product-page-skinceuticals-c-e-ferulic) - [Bluemercury Product Page — SkinCeuticals C E Ferulic](https://skinknowledgebase.com/sources/bluemercury-product-page-skinceuticals-c-e-ferulic) - [Official product page — TRUE Serums EGF Serum](https://skinknowledgebase.com/sources/official-product-page-true-serums-egf-serum) - [Vitamin C](https://skinknowledgebase.com/ingredients/vitamin-c) - [Vitamin E](https://skinknowledgebase.com/ingredients/vitamin-e) - [Ferulic Acid](https://skinknowledgebase.com/ingredients/ferulic-acid) - [Dullness](https://skinknowledgebase.com/concerns/dullness) - [Peter Thomas Roth Potent-C Power Serum](https://skinknowledgebase.com/products/peter-thomas-roth-potent-c-power-serum) - [TRUE Serums EGF Serum](https://skinknowledgebase.com/products/true-serums-egf-serum) - [Facial Hyperpigmentation](https://skinknowledgebase.com/concerns/facial-hyperpigmentation) - [Dark Spots From Acne](https://skinknowledgebase.com/concerns/dark-spots-from-acne)