SkinCeuticals C E Ferulic Serum is iconic. We don’t use that word lightly here at Allure, but this skin-care product has certainly earned it. C E Ferulic has won eight Best of Beauty and Readers’ Choice Awards (six and two, respectively)—no small feat, especially for a 1-ounce serum that costs nearly $200.

Since its launch in 2005, C E Ferulic has become well-known as one of the best antioxidant formulas on the market. Its primary claims to fame are its ability to brighten skin, combat hyperpigmentation, and add hydration. This has all been done via a potent mix of the three ingredients in the name: 15% vitamin C, 1% vitamin E, and 0.5% ferulic acid. People are, in a word, obsessed with the results they say they see from adding CEF to their routine.

So if you heard a strange, faint gust of wind on July 20, 2026, it was likely the collective gasp of skin-care enthusiasts and dermatologists around the globe after SkinCeuticals announced it had reformulated the best-selling formula. The corresponding press release—which the Allure team got access to in early July, along with product samples—says CEF 2.0 is building on the original’s legacy by way of “exclusive longevity technology.”

Just reading the word “longevity,” a now-inescapable marketing term, fills me with a profound mix of dread and exhaustion. But, as a C E Ferulic loyalist at my core, my interest was piqued. Here’s everything we know about the update, plus our honest thoughts after testing the serum for a few weeks.

Why Did SkinCeuticals Reformulate Its C E Ferulic Serum?

Why on earth would SkinCeuticals go and mess with a formula that is widely considered the best of the best? “It was a delicate decision, obviously,” Stephen Lynch, head of skin-care valorization, research and innovation for North America at L’Oréal Groupe (meaning he helps guide product development and then tells the general public about those new innovations), tells Allure. But it’s been 20 years since the original launch and, according to Lynch, the team has never stopped trying to improve on it.

“We have always been thinking, ‘How could we modernize [the serum] or bring a little extra while preserving what we have?” Lynch says. He insists that the bidecadal anniversary was just “the right time” to roll out a new-and-improved version.

Fair, but also…the patent on the original formula expired last year, leaving doors open for other brands to launch extremely similar serums, at least as far as the ingredient list goes. With no active patent on the formula, L’Oréal, SkinCeuticals’ parent company, couldn’t bring an infringement lawsuit against those brands as it had against Drunk Elephant in 2020. In the US, once a patent expires after the standard 20-year period of exclusivity, it has really expired: You can’t just keep renewing it every two decades, explains Sheila Swaroop, a registered patent attorney and partner at Knobbe Martens in California.

This new version of C E Ferulic is “powered by exclusive double patent-pending technology,” according to the company’s press release, which could certainly be a way to re-establish the claim that no one’s doing it quite like SkinCeuticals. Says Swaroop, “If you develop a different product and it's different enough from the original product that you can secure patent protection for it, then that can be a strategy” to sort of get your patent back. (Patents are different from “trade secrets,” which is the method Coca-Cola has used to keep its formula confidential since its invention in the 1880s, Swaroop notes; those are valid indefinitely, as long as the company never discloses the formula publicly.)

According to Swaroop, there is no set percentage of a formula that needs to change for it to qualify as a new patent. It depends on the patent office, she says, but there generally needs to be a “true difference in the formulation” or “some additional, unexpected benefit” that didn’t come from the original.

When I ask Lynch if the patent expiration has anything to do with the timing of this reformulation, he shakes his head: “We already had a lot of research in process,” he says. “There have been a lot of advances in the science [since the original launched], so we were ready to go.”

What’s Different About the New SkinCeuticals C E Ferulic Serum Formula?

This new C E Ferulic is not going to be an additional SKU in the SkinCeuticals lineup; the brand is phasing out the old version entirely. Now, an assurance for the sweaty-palmed folks who are trying to figure out where they can still buy the original formula before it vanishes for good: Lynch insists that, for the most part, the new C E Ferulic Serum is very similar to the old, beloved version. The only difference the brand is disclosing is the addition of two new ingredients: 1% endophytol and 0.3% carnosine (more on both in a second).

“It can be challenging to predict results just by looking at an ingredient list, but I would also be hesitant to speculate a dramatically different experience with the new formula,” cosmetic chemist Ava Perkins tells Allure after we sent over the press materials for her thoughts. “I would anticipate the main antioxidant system to still be doing the heavy lifting and the new additions to be complementary, or boost the results people already see from the original formula, like improving discoloration, elasticity, radiance, and tone.” Indeed, it seems that those two new ingredients will likely just enhance the CEF experience fans are used to.

New Ingredient: Endophytol

Let’s start with endophytol, a new trademarked ingredient derived from dandelion extract: “It’s a very nice anti-inflammatory,” Lynch says, noting that reports of skin irritation from the original CEF are what inspired the company to look into anti-inflammatory ingredients that might pair well with the existing mix. “If [a customer was] getting a little bit of that redness, a little bit of that irritation, they might see a slight mitigation of that [with the updated formula].”

This is potentially huge news for the group of people whom I can anecdotally confirm find the old formula is too harsh for their skin. “If endophytol helps with inflammation, as it claims, it would be a fantastic addition to the formula considering pure ascorbic acid formulas tend to be irritating for many,” Perkins says. “This would signal to me that they are listening to their consumer feedback and improving their formula in ways that would make it both more efficacious and more friendly to use.” (SkinCeuticals’ research team has conducted in vitro ingredient studies on endophytol, but they will not have results of those studies until closer to the end of this year or early next year.)

New Ingredient: Carnosine

The second new ingredient is carnosine, another antioxidant and dipeptide that Perkins says—unlike endophytol—has been used in skin care for a while. “Simply put, it can help reduce the appearance of fine lines and wrinkles,” she explains, noting that the addition “aligns with the longevity trend booming in the skin-care space right now.” (See? Inescapable.)

Lynch says they added carnosine to the already antioxidant-packed formula after realizing that “vitamin C is maybe not the best ingredient to fight glycation,” a natural process that can lead to early signs of aging, like the aforementioned fine lines and wrinkles, as well as skin sallowness. “We think carnosine is a really great ingredient for this,” Lynch says. Vitamin C, he adds, also helps improve the appearance of fine lines and wrinkles, but its real strength is in brightening and combatting discoloration. The addition of carnosine is meant to complement the ascorbic acid for even more noticeable results.

How does the new formula stand up to the old one in terms of long-term results? That's still a question mark: SkinCeuticals said they are working on clinical studies of the new products, but don't have anything to share yet.

Scent and Texture Differences

While our editors believe there’s a slight difference in the texture and scent of the new formula, Lynch says loyal customers should expect them to be about the same. Of the texture—a rich-but-lightweight liquid that feels quite hydrating for a serum—Lynch says, “It’s going to be very similar to all our consumers. I think they’ll enjoy it.”

The legendary hot-dog scent isn’t going anywhere, either, because as Lynch says, it comes from the blend of ingredients in the original formula, which isn’t being eliminated.

Packaging Differences

There is no visible difference in the new packaging: CEF will still come in an amber, 1-ounce bottle with a dropper applicator. The new label is exactly the same as the original, with no special mention of the two new ingredients anywhere other than the ingredient list.

That’s it! Otherwise, the product—and the price point of $185—remains the same. “It was really a challenging project,” Lynch says of trying to update the product without disappointing hoards of loyal fans. “I'm really proud of the way we were able to keep the essence of the original formula.”

Editor Reviews

I got a bottle of the new formula only about a week before launch, so my impressions are still very much in the “first” stage. To me, the serum texture (lightweight with a touch of hydration) feels and smells (like the OG, often described as “hot-dog water,” a scent I find comforting) about the same as the original. My skin has neither been instantly transformed nor irritated, but I didn’t have any sensitivity with the old formula, either.

Allure senior staff writer Elizabeth Gulino agrees: “I notice zero differences between the old version and the new one, besides the fact that my older one has oxidized,” she says. “This is amazing news for someone like me who hates when things change.”

Kassidy Silva, Allure social director, used up her last bottle two months ago and was tempted to try a dupe, but is happy she ultimately waited it out. “It’s still the C E Ferulic I’ve grown to know and love,” she says. “Dare I say the smell is a little less pungent than the original? I get more ‘mustard ham’ than ‘hot-dog water.’” After just a week, she thinks she’s noticing a little extra glow to her skin.

Allure executive beauty director Jenny Bailly has picked up on even more differences. “OG C E Ferulic feels thicker; there’s more heft to it,” she says. “The new one is more watery and silky.” She, too, feels the smell is less pungent (“Maybe a faint note of bologna?”). “I don't like change, and I was very happy with the color, texture, and yes, the hot-dog-water scent of the old C E Ferulic,” Bailly adds. “But if the people at SkinCeuticals say this updated version will be even better for my skin…they have not steered me wrong in the past, so I’m in.”

The new-and-improved SkinCeuticals CE Ferulic retails for $185 and is out now at skinceuticals.com.