This little-known Korean brand has just cracked the top 10 in skincare: we’ve broken down its best-seller ingredient by ingredient
This week's surprise brand is all about vitamin C: we've broken down its formula
Every week, the Beauty Decoded community reveals the rising marquess (these are the most-searched marquess on the Beauty Decoded app). And this time, an unknown entry has slipped into the rankings: Arencia, a Korean brand that hardly anyone was looking for just seven days ago.
Its flagship product? A vitamin C booster. The perfect opportunity to do what we do best: take a closer look and examine the formula. Because when it comes to vitamin C, two bottles that look alike can yield radically different results.
This Week's Rankings
At the top, stability: Anua remains the leader, followed by CeraVe (up sharply) and SVR. Then comes the surprise: Arencia jumps straight to the top of the standings, alongside established names such as Avène, Medicube, Caudalie, Yepoda, Aromazone and Cosrx.
Vitamin C: The Most Misunderstood Ingredient in Your Bathroom
Before we break down Arencia, here’s a helpful reminder. Vitamin C isn’t an ingredient—it’s a family ingredients. And not all of them are created equal.
There is the pure and powerful form, the’ascorbic acid incredibly effective but unstable and sometimes irritating. And then there are its derivatives (ascorbyl glucoside, sodium ascorbyl phosphate, 3-O-ethyl ascorbic acid…), which are gentler and more stable, but often have lower concentrations and are less easily absorbed.
That's the whole point. And that's also why, on the app, vitamin C serums are among those that are the most divisive : Some are loved, while others are considered ineffective or annoying.
What Arencia's Formula Reveals
Let's take a hard look at the list of ingredients in Arencia's vitamin C booster.
First, the good news: the brand doesn't rely on just one form of vitamin C, but on a cocktail. It includes 3-O-ethyl ascorbic acid at a concentration of 5 % (50,000 ppm) a stable and well-tolerated derivative backed by a microdose of pure ascorbic acidtheascorbyl glucoside and sodium ascorbyl phosphate. A rather clever «multivitamin C» strategy: targeting several mechanisms of action at once.
The rest of the formula makes sense: from the niacinamide (brightness and control), of the glutathione and theadenosine(antioxidants), and a soothing trio panthenol / allantoin / arginine to minimize the risk of irritation associated with vitamin C.
The downside, to be completely transparent: the presence of’pure ascorbic acid, even in small doses, as a base ingredient, raises the classic question of stability over time.
Beautydecoded's opinion
«This formula is cleverly designed, and that's exactly why we need to be cautious. Combining multiple forms of vitamin C doesn't guarantee greater effectiveness—it's sometimes just a marketing ploy.".
What matters clinically is the dominant form and its concentration. In this case, 3-O-ethyl ascorbic acid at 5 % is a good choice—it is stable and well-tolerated, and it is the true active ingredient. Microdoses of the other forms primarily serve a supplementary role.
The Beauty Decoded Community's Opinion
Arencia is too new to have accumulated verified reviews on the app—that’s the nature of a surprise newcomer: the buzz comes before the experience. But the community data on vitamin C in general speaks volumes.
The contrast is striking. A vitamin C serum like the C Glow by Geek and Gorgeous reaches a peak at 4,76/5 (48 reviews), while another vitamin C product from a popular brand tops out at 3,13/5 (38 reviews) for a product that makes a similar claim. Proof that price and hype are no guarantee of results.
When it comes to safe bets, the’SVR Hydra Vitamin B3 Ampoule reassures the community (4.44/5, 54 reviews), just like the C15 Super Booster by Paula’s Choice (4.8/5). The lesson is clear: when it comes to vitamin C, it’s never the brand that makes the difference, but the formula and how to use it.
Things to remember
The launch of Arencia is a great opportunity to remember what really matters: an appealing new product deserves to be analyzed, not just taken at face value. Its vitamin C formula is well-designed, but its actual effectiveness will depend on its stability and your skin.
A serum that leaves you puzzled?
Stop guessing. Download the app for free Beauty Decoded (iOS & Android), scan the vitamin C serum you’re interested in—whether it’s Arencia or any other brand—and instantly discover its actual formula, stability, and verified reviews from the community. Do your research before you buy.
