Vitamin C Without the Irritation: Next-Generation Serum for Sensitive Skin

Vitamin C · Ingredient Science

• Brightens — Revives dull, lacklustre skin for a more luminous complexion.
• Evens skin tone — Reduces the appearance of dark spots and uneven pigmentation.
• Protects against environmental damage — Neutralises free radicals from UV exposure and pollution.
• Boosts collagen production — Supports firmness and elasticity for more youthful-looking skin.

If you've struggled with traditional vitamin C serums causing redness, stinging or sensitivity, there's now a solution. Exo C Booster is powered by 3-O-Ethyl ascorbic acid, a non-irritating, bioavailable vitamin C alternative designed specifically for reactive and sensitive skin. Here's how it delivers clinical results without the irritation.

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01 — The Problem

Choosing the Right Vitamin C Formula for Sensitive Skin

Vitamin C is one of the most researched ingredients in skincare, but not all formulas are created equal. The most common form, L-ascorbic acid, is powerful and well-studied — however its formulation requirements mean it isn't always the best fit for sensitive or reactive skin:

• pH dependency — It requires a very acidic formulation pH — as low as pH 3 — to remain active, which can disrupt the skin barrier and increase sensitivity.
• Oxidative instability — It oxidises quickly, becoming less effective and, once degraded, can actually generate the free radicals it was meant to neutralise.
• Skin sensitivity — At a low pH, some skin types may experience a period of adjustment when first introducing L-ascorbic acid, particularly if the skin barrier is reactive or compromised.

These are the very challenges that informed Dr Sebagh's approach to vitamin C innovation. The Pure Vitamin C Powder Cream uses encapsulation technology to address L-ascorbic acid's fragility directly, keeping the active ingredient stabilised, protected from oxidation, and fresh until the moment of application.

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02 — The Ingredient

What Is 3-O-Ethyl Ascorbic Acid? A Gentler Vitamin C Alternative

3-O-Ethyl ascorbic acid is a next-generation, non-irritating vitamin C alternative engineered for stability, efficacy and, crucially, comfort. It is the most advanced form of vitamin C available in skincare today.

• Gentle alternative to L-ascorbic acid — Formulated at a skin-compatible pH — far gentler than the pH 3 required by traditional vitamin C — with a gradual, sustained release that is less aggressive on the skin, making it suitable for even the most reactive complexions.
• Superior stability — Far more resistant to oxidation than L-ascorbic acid, producing fewer irritating by-products over time. The Exo C Booster is also housed in a specialist amber glass bottle to minimise light exposure and preserve potency from first use to last.
• Highly bioavailable — Once absorbed, it converts into active vitamin C within the skin, achieving the same clinical results as L-ascorbic acid without surface irritation.
• Supports a resilient skin barrier — By working at a skin-compatible pH with a gradual release formula, Exo C Booster is kind to the skin's natural protective layer, helping to keep it strong and healthy with continued daily use.

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03 — The Benefits

Exo C Booster Benefits for Sensitive & Reactive Skin

Unlike traditional vitamin C serums, Exo C Booster delivers brightening, firming and antioxidant benefits without irritation, making it the ideal vitamin C for reactive skin.

• Brightens without irritation — Improves luminosity, revives dull and lacklustre skin, and enhances clarity for a more even skin tone, without the redness or stinging of traditional formulas.
• Reduces dark spots on reactive skin — Vitamin C acts as a tyrosinase inhibitor, reducing the enzyme required to produce excess pigment. The result: visibly reduced sun damage, post-blemish marks and uneven tone over time.
• Supports skin barrier and collagen — Vitamin C is an essential co-factor in natural collagen synthesis. The Exo C Booster goes further still: blended with bio-synthesised collagen, it supports firmness and elasticity from two directions — stimulating the skin's own collagen production while replenishing collagen directly, for a more lifted, youthful appearance.
• Antioxidant protection for sensitive complexions — Neutralises the free radicals generated by UV exposure and pollution, protecting collagen and skin health from daily environmental damage.

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04 — How to Use

How to Add Vitamin C to Your Sensitive Skin Routine

Here's how to safely introduce a vitamin C serum into your sensitive skin routine:

• Apply 2–3 drops to freshly cleansed skin, morning or night, before your moisturiser.
• Blend with your serums — pairs effortlessly with Serum Repair and sits cleanly beneath SPF without pilling. Think of Exo C Booster as your radiance amplifier: your serums and creams just got smarter.
• Always finish with SPF — vitamin C and UV protection are synergistic. Sunscreen reduces the oxidative load that vitamin C then neutralises throughout the day.
• New to vitamin C serum? Start 3–4 mornings per week to build tolerance, then move to daily use. Fully compatible with peptides and all Dr Sebagh hero products.

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05 — Shop

Best Vitamin C Serum Products to Pair with Exo C Booster

Complete your sensitive skin vitamin C routine with these complementary Dr Sebagh products, each formulated to work alongside the Exo C Booster for brighter, firmer and more even-toned skin.