At AUREIN, we believe that an informed customer is a better customer. Understanding what’s in your skincare — and why — helps you build a routine that genuinely works for your skin, rather than one built on trends and marketing claims.
Here’s a closer look at the key ingredients across our range, and the science behind why we chose them.
Ethyl Ascorbic Acid — Vitamin C, Stabilised
Vitamin C is one of the most well-researched brightening and antioxidant ingredients in skincare. The challenge has always been stability — traditional L-Ascorbic Acid oxidises quickly, turning products orange and reducing their effectiveness before they reach your skin.
We use Ethyl Ascorbic Acid instead. It’s a stabilised ester form of Vitamin C that converts to active ascorbic acid on the skin, delivering the same brightening, collagen-supporting, and antioxidant benefits without the instability. At 15%, it’s a working concentration — not a token amount.
Salicylic Acid + Azelaic Acid — The Clarity Combination
For congested, breakout-prone skin, these two actives complement each other exceptionally well. Salicylic Acid is oil-soluble, meaning it can penetrate into the pore lining to dissolve the sebum and debris that cause blackheads and breakouts. Azelaic Acid works at the surface and follicle level simultaneously — reducing post-breakout pigmentation, calming redness, and gently inhibiting the bacteria associated with acne, all with an excellent tolerability profile.
Together, they cover the full cycle of congestion: prevention, clearing, and recovery.
Ceramides — The Barrier Blueprint
Ceramides are lipid molecules that make up approximately 50% of the skin’s outer barrier. They act like the mortar between bricks — holding skin cells together and preventing transepidermal water loss. When ceramide levels drop (through ageing, harsh cleansing, or over-exfoliation), the barrier weakens, leading to dryness, sensitivity, and increased reactivity.
Our Dew Barrier Moisturiser includes both Ceramide NP and Ceramide AP — two of the most structurally significant ceramide types — alongside Squalane, which replenishes the lipid component of the barrier without occluding pores.
Niacinamide — The Multitasker
Niacinamide (Vitamin B3) appears across our range for good reason. It is one of the most versatile and well-tolerated actives in skincare, with peer-reviewed evidence for reducing hyperpigmentation, strengthening the barrier, regulating sebum, minimising pore appearance, and calming visible redness. It also works well alongside virtually every other active, making it an ideal supporting ingredient.
We use it at 2–5% depending on the product — always at a concentration that contributes meaningfully to the formula.