Peter Thomas Roth Potent-C Power Serum Review (2020 Update)


Today, I’m going to discuss the popular Peter Thomas Roth Potent-C Power Serum.

Does this product live up to its claims? Let’s find out. ⭐


ⓘ In today’s post, I’ll share my 2¢ on Peter Thomas Roth Potent-C Power Serum!

Peter Thomas Roth Potent-C Power Serum

Summary: The Potent-C Power Serum offers a high concentration of stable vitamin C to help fade stubborn hyperpigmentation. 💪

Best For: Melasma, Age Spots

Key Ingredients:
20% Vitamin C (THD Ascorbate)
3% Vitamin E
2% Ferulic Acid

Get It @ Ulta Beauty, Amazon

Peter Thomas Roth Potent-C Power Serum
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(The following review is taken from my post on the Best Vitamin C Serums for Hyperpigmentation)

For more stubborn forms of hyperpigmentation like melasma and age spots, I recommend trying a higher potency vitamin C serum like the Peter Thomas Roth Potent-C Power Serum.

(Sorry, I just couldn’t resist making that pun 😂).

Peter Thomas Roth is a skincare brand inspired by the old-world spas in Hungary’s thermal springs. I’ve bought a few of their products in the past and have always been impressed with the results, including the Acne Spot & Area Treatment and Anti-Aging Cleansing Gel.

The Potent-C Power Serum features a high concentration of 20% Tetrahexyldecyl (THD) Ascorbate, which is an oil-soluble vitamin C derivative (called an ester), plus 3% Vitamin E and 2% Ferulic Acid.

But what exactly is Tetrahexyldecyl Ascorbate? Let’s break down what this really means:

  • Tetra (meaning four)
  • Hexyl (a chemical derivative of hexane, C6H14, but with one less hydrogen molecule, C6H13)
  • Decyl (a chemical derivative of decane, C10H22, but with one less hydrogen molecule, C10H21)
  • Ascorbate (the conjugate base of L-Ascorbic Acid, for our purposes, just Vitamin C)

In short, THD ascorbate is a vitamin C derivative where four long carbon chains (the hexyl-decyl’s) are attached to our good friend, L-ascorbic acid. This makes the resulting compound more stable and oil-soluble, which might even increase its skin penetration abilities (source: Stability, Transdermal Penetration, and Cutaneous Effects of Ascorbic Acid and its Derivatives, 2012).

L-Ascorbic Acid vs Tetrahexyldecyl Ascorbate
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However, as InciDecoder explains, studies into THD ascorbate so far are mainly in-vitro (lab tests) with only two in-vivo studies (clinical trials) with small sample sizes (source: here and here).

In contrast, L-ascorbic acid is supported by in-vitro and in-vivo studies for antioxidant protection, melanin inhibition (skin brightening), and collagen synthesis. It remains the gold standard.

Finally, Peter Thomas Roth claims THD ascorbate is “50x more powerful than traditional Vitamin C”, but I have not found any evidence to support this claim. THD ascorbate is more stable but no studies have directly compared the efficacy between the two forms.

In terms of additional ingredients in Potent-C Power Serum, there’s a very strong antioxidant blend of 3% Vitamin E and 2% Ferulic Acid (compared to 1% and 0.5% in SkinCeuticals C E Ferulic). Hyaluronic Acid and botanical extracts of Ginger, Turmeric, and Ginseng are also included.

Peter Thomas Roth Vita-C Glycolic Brightening Serum Ad
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Customer reviews have been very positive so far, including comments about:

  • Clearer, smoother, and more even-looking complexion
  • Leaves skin feeling hydrated and tightened at the same time
  • Product feels like a lotion and absorbs well into the skin
  • Helps resolve dark spots, sun spots, milia, redness, and bumps
  • Pump container packaging prevents vitamin C oxidation

On the other hand, some of the most common complaints included:

  • One user said it smelled “horrible”, others said the smell was tolerable and like hot dog juice (notably, Peter Thomas Roth does not use any fragrance in this product)
  • Some users also said that it left their skin feeling greasy afterwards

My Verdict: If you need a more powerful vitamin C serum for stubborn forms of hyperpigmentation, I recommend the Peter Thomas Roth Potent-C Power Serum with next-generation Vitamin C alongside antioxidants Vitamin E and Ferulic Acid. But bring your wallet because the Power Serum comes with a pretty potent price tag as well. 💳

Up Next:
The Best Vitamin C Serums for Hyperpigmentation

Best Vitamin C Serum for Hyperpigmentation
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