Potent-C Power Serum
Potent-C Power Serum
Product Description
Product overview
By Peter Thomas Roth — a high-potency, lightweight brightening serum built around 20% THD Ascorbate, an ultra-stable, oil-soluble form of Vitamin C that resists oxidation far better than traditional L-ascorbic acid. Boosted by 3% Vitamin E and 2% Ferulic Acid, plus turmeric, ginseng, squalane and hyaluronic acid, it targets dullness, dark spots, uneven tone and early signs of aging while keeping skin hydrated. Fragrance-free formula.
Ultra-Stable Vitamin C
THD Ascorbate is oil-soluble and far more resistant to oxidation than L-ascorbic acid, so the formula stays potent longer.
Texture & feel
SENSORYUltra-Stable Vitamin C
THD Ascorbate is oil-soluble and far more resistant to oxidation than L-ascorbic acid, so the formula stays potent longer.
Brightening Power
Targets dark spots, dullness and uneven tone for a visibly more radiant, even complexion over time.
Antioxidant Trio
Vitamin C, Vitamin E and Ferulic Acid work synergistically to neutralize free radicals from sun and pollution.
Hydrating Base
Squalane, sodium hyaluronate and jojoba esters cushion skin, easing the dryness many vitamin C serums cause.
Safety & compatibility
SAFEContains no retinoids, salicylic acid, hydroquinone or chemical sunscreens. Vitamin C derivatives are generally considered safe — confirm with your doctor.
Not malassezia-safe. Contains polyglyceryl esters, fatty alcohols and coco-caprylate that can feed malassezia in fungal-acne-prone skin.
Built mainly on squalane and jojoba esters; lightweight and unlikely to clog pores for most skin types.
Pairs well with niacinamide, peptides, hyaluronic acid and SPF. Best used in the morning under sunscreen.
Medium irritation potential. A handful of users report tingling or reactions — always patch test before full-face use.
Boosts daytime antioxidant defense but is not a sunscreen. Always finish your AM routine with broad-spectrum SPF.
Ingredient breakdown
INGREDIENTSTetrahexyldecyl Ascorbate (THD) 20%Proven
An oil-soluble, ultra-stable derivative of Vitamin C. Because it is lipid-soluble, it penetrates deeper into skin's fatty layers than plain ascorbic acid while delivering the same antioxidant and brightening benefits.
- Stability: Far more resistant to oxidation than L-ascorbic acid, so it stays effective longer.
- Brightening: Concentrations of 5%+ help fade dark spots and hyperpigmentation; this serum uses a high 20%.
- Tolerance: Generally gentler and less likely to sting than traditional Vitamin C.
Vitamin E (Tocopheryl Acetate) 3%Proven
A lipid-soluble antioxidant that protects skin from free-radical damage and helps stabilize Vitamin C. Studies show Vitamin C and E together reduce sun-induced cell damage more than either alone.
- Synergy: Regenerates oxidized Vitamin C, extending antioxidant performance.
- Barrier support: Helps soften skin and reduce moisture loss.
Ferulic Acid 2%Proven
A plant-based antioxidant that both fights free radicals and acts as a stabilizer, helping prevent Vitamin C from breaking down. The C + E + Ferulic combination is a well-documented antioxidant trio.
- Stabilizer: Extends the shelf life and potency of the Vitamin C in the formula.
- Protection: Helps reduce the formation of fine lines and hyperpigmentation from UV exposure.
Squalane EmollientProven
A lightweight, non-irritating emollient that mimics skin's own oils. It boosts hydration and adds antioxidant support, helping offset the dryness that potent Vitamin C can cause.
- Tolerance: Research shows squalane is non-irritating even at high concentrations.
- Note: Fungal-acne safety depends on the source (sugarcane-derived is preferred).
Sodium Hyaluronate HumectantProven
The salt form of hyaluronic acid. It draws water into the skin to keep it hydrated and plump, supporting a smoother, more cushioned feel after application.
- Hydration: Holds many times its weight in water for lasting moisture.
- Barrier: Well-hydrated skin maintains a healthier protective barrier.
Turmeric & Ginseng Blend BotanicalsPromising
Curcuma Longa (turmeric) and Panax Ginseng root extracts add antioxidant and anti-inflammatory support. Both are studied for helping even tone, soothe skin and inhibit the enzyme involved in pigmentation.
- Turmeric: Antioxidant curcumin may help calm skin and reduce sun-induced pigmentation.
- Ginseng: Supports circulation and radiance; may help reduce the look of hyperpigmentation.
29 ingredients
Water, Tetrahexyldecyl Ascorbate, Butylene Glycol, C9-12 Alkane, Caprylyl Methicone, Tocopheryl Acetate, C10-18 Triglycerides, Polyglyceryl-6 Distearate, Ferulic Acid, Squalane, Hydrogenated Lecithin, Propanediol, Sodium Hyaluronate, Zingiber Officinale Root Extract, Curcuma Longa Root Extract, Panax Ginseng Root Extract, Jojoba Esters, Leuconostoc/Radish Root Ferment Filtrate, Coco-Caprylate/Caprate, Glycerin, Cetyl Alcohol, Polyglyceryl-3 Beeswax, Xanthan Gum, Disodium EDTA, Mica, Ethylhexylglycerin, Potassium Sorbate, Sodium Benzoate, Phenoxyethanol.
Where it fits in your routine
ROUTINEApply after cleansing and toning, before heavier creams. It can be used AM and PM, but morning use maximizes antioxidant protection under sunscreen.
How to use
HOW TO USEStart clean & dry
Cleanse and pat skin dry. Apply Vitamin C to dry skin for best absorption.
Apply 1–2 pumps
Warm between fingertips and gently press over the face, neck and back of hands.
Let it absorb
Wait about 60 seconds. It may feel slightly tacky at first, then settles into a dewy finish.
Seal & protect
Follow with moisturizer. In the morning, always finish with broad-spectrum SPF.
Who is it for?
WHOPerfect for you if:
- You want a stable Vitamin C that won't oxidize quickly
- You have normal, dry or combination skin
- You're targeting dullness, dark spots and early fine lines
- L-ascorbic acid has stung or broken you out before
- You're pregnant or breastfeeding and want a safer brightener
Consider alternatives if:
- You have fungal (malassezia) acne concerns
- You're very sensitive to scent — it has a distinct natural odor
- You're shopping on a tight budget
- You want a clinically maxed-out L-ascorbic acid formula
- Your skin is highly reactive without patch testing first
Skin type compatibility
SKIN TYPESLightweight and fast-absorbing, though slightly emollient — a little goes a long way.
Squalane and hyaluronic acid add comfort and glow without feeling stripping.
Balances brightening with hydration across both oily and dry zones.
Gentler than L-ascorbic acid, but medium irritation potential means a patch test is wise.
Low pore-clogging risk and rarely breaks people out — but it is not fungal-acne safe.
Results timeline
8–12 WEEKSInitial Radiance
Skin looks brighter, more hydrated and a touch more even — the brand markets visible improvement in 7 days based on a consumer perception study.
Brand 7-day claimTone & Texture
Dark spots and uneven tone begin to soften and skin feels smoother, supported by a 4-week study on women aged 49–65.
Backed by 4-week studyFirmness & Fine Lines
With consistent daily use, fine lines, firmness and overall brightness show their most noticeable improvement.
Long-term useRatings by platform
784+ REVIEWSPros & cons
BALANCEDPraised
- Stable, non-oxidizing Vitamin C that stays effective
- Visible brightening and radiance, often within a week
- Gentler than L-ascorbic acid — rarely stings or breaks out
- Hydrating, lightweight feel from squalane and HA
- Opaque packaging protects the formula from light and air
Criticized
- Distinct, polarizing natural scent despite being fragrance-free
- Premium price (~$95 for 1 oz)
- Can feel tacky for the first minute after applying
- Not fungal-acne (malassezia) safe
- Occasional reports of a faulty or finicky pump
Budget-friendly alternatives (dupes)
DUPESUses the same 20% oil-soluble THD-type Vitamin C in a simple fatty-acid base. Closest formula match, but skips the Vitamin E, ferulic acid and botanical extras.
15% L-ascorbic acid with Vitamin E and ferulic acid. Strong antioxidant data, but the L-AA form oxidizes faster and can sting more than THD.
A gentle multi-form Vitamin C complex at a great price. Easy to tolerate, but less concentrated and less targeted than the 20% THD formula.
Comparison with competitors
SIDE-BY-SIDEPotent-C Power Serum
SkinCeuticals C E Ferulic
Storage & shelf life
12 MONTHS12 months after opening. For peak Vitamin C potency, aim to finish within that window.
Store in a cool, dry place away from direct sunlight; keep the cap closed to preserve potency.
Opaque pump bottle that shields the formula from light and air to slow oxidation.
Yes — at 30ml it's well under the 100ml carry-on liquid limit.
Frequently asked questions
FAQGenerally, yes. It contains no retinoids, salicylic acid, hydroquinone or chemical sunscreens — the ingredients usually flagged during pregnancy. Its Vitamin C, Vitamin E, ferulic acid and hyaluronic acid are widely considered pregnancy-friendly. As always, confirm with your OB-GYN or dermatologist before adding any product during pregnancy or nursing.
No. The formula contains polyglyceryl esters (Polyglyceryl-6 Distearate, Polyglyceryl-3 Beeswax), fatty alcohols and coco-caprylate/caprate, which can feed malassezia. If you're prone to fungal acne, this serum is best avoided in favor of a malassezia-safe alternative.
Yes, with smart timing. Many people use Vitamin C in the morning and retinol or exfoliating acids (AHA/BHA) at night to minimize irritation. It also layers well with niacinamide, peptides and hyaluronic acid. Introduce one active at a time and use SPF daily.
It suits most skin types but performs best on normal, dry and combination skin looking to brighten dullness, fade dark spots and soften early fine lines. The THD form is also a good pick for those whose skin reacts to traditional L-ascorbic acid. Very sensitive skin should patch test first.
Many users notice brighter, more hydrated skin within about a week (the brand markets a 7-day radiance claim). Tone and texture typically improve over roughly 4 weeks, while firmness and fine lines show the most change with 8–12 weeks of consistent daily use.
Apply it after cleansing and toning, before eye cream and moisturizer. Morning use is ideal so the antioxidants can support your skin's defense against daily UV and pollution under sunscreen. It can also be used at night.
It carries a low pore-clogging risk (around 2 out of 5). The base relies on squalane and jojoba esters, which are well tolerated by most skin. It rarely causes breakouts, though it is not suitable for those specifically managing fungal acne.
The Period After Opening is 12 months. Thanks to the stable THD Ascorbate and opaque, air-protective packaging, it holds up better than many L-ascorbic acid serums — but storing it cool and away from light, and finishing it within the PAO window, keeps it at peak potency.
Verdict: Peter Thomas Roth's Potent-C Power Serum is a standout for anyone who wants the brightening benefits of Vitamin C without the instability and sting of L-ascorbic acid. The high 20% THD Ascorbate, backed by Vitamin E, ferulic acid and a hydrating squalane-and-HA base, delivers visible radiance and gentle, reliable performance. The main trade-offs are its distinct natural scent and premium price — but for stable, well-tolerated, results-driven Vitamin C, it earns its place as a worthwhile splurge.
Product Overview
Quick product notes are a great way to check if a product is free from commonly avoided ingredients by skincare enthusiasts. These preferences come about for different reasons depending on the ingredient such as personal experiences, sensitivities, health preferences & etc.
Just because a product is not free from a common preference does not mean it's a bad product! You can make a personal decision whether or not you want to use a product that contains these ingredients or not - click the labels of the preference to read more about them.
Quick Product Notes
Ever used a product that promised a certain effect but provided no results? It might not have contained any notable ingredients that could have been responsible for that promised effect. It doesn't matter what the marketing or packaging «promises» it can do, if it doesn't contain anything that can help - then the likelihood of it helping is low.
We help you identify key notable ingredients that have been shown to help with effects such as acne-fighting, brightening, UV-protection, wound healing & anti-aging to help you achieve your skincare goals smarter. Please note that different notable ingredients have varying levels of research behind them, some are extremely well proven yet some have mixed research in their efficacy.
Just because a product doesn't contain any notable ingredients doesn't mean it's bad. And a product with notable ingredients (or even many) doesn't necessarily guarantee the efficacy of the product performing these effects either. There are other factors such as ingredient quality, concentration and formulation that will ultimately determine this.
Be smart and use this as just a starting point for you to make more informed and smarter choices and compare it with reviews to see if the product is right for you
Notable Effects & Ingredients
Why are some products great for some people and horrible for others? Well everyone has different skin types and different reactions to the same ingredients.
We've identified a range of ingredients that are commonly regarded as potentially good or bad for those with Dry, Oily/Acne-Prone or Sensitive skin.
A product that contains good or bad ingredients for your skin type doesn't always flat out make the entire product good or bad for your skin. There are other factors such as ingredient quality, concentration and formulation that will ultimately determine your skins reaction.
One of the best ways to use this section is to troubleshoot products you've had bad experiences with in the past. Check if it contains any of the marked ingredients to point out suspect ingredients to avoid in the future!
Ingredients Related to Skin Types
Ingredient Safety Breakdown refers to the percentage % of ingredients in different risk categories as classified by EWG (Environment Working Group) if they are available. There are almost endless cosmetic ingredients and they are one of the few organisations globally that have assigned ratings to a lot of the more commonly used ingredients which is why we reference them.
EWG is seen by many to be more on the alarmist side in their assignment of health ratings resulting in rating ingredients as riskier than they actually are. We recommend using this a reference point rather than a strict guide of ingredient safety and to always do further research if into ingredients that you may find suspect.
Ingredient Safety Breakdown
Product ingredient list
| EWG | CIR | Ingredient Name & Cosmetic Functions | Notes |
|---|---|---|---|
| 1 |
Water
Solvent, Skin Conditioning
|
|
|
| 1 |
Tetrahexyldecyl Ascorbate
Skin Conditioning, Antioxidant
|
Redness
Texture
Pores
|
|
| 1 |
Butylene Glycol
Solvent, Skin Conditioning, Masking, Fragrance, Humectant, Viscosity Controlling, Viscositydecreasing Agent
|
Hydrating
|
|
| 0 |
C9-12 Alkane
Solvent
|
|
|
| 1 |
Caprylyl Methicone
Skin Conditioning
|
|




