15% Vitamin C + EGF Serum | The INKEY List

Can be used in the AM and PM, but recommend in the AM. Antioxidants protect skin against daytime aggressors (UV, pollution and environmental stress), so you'd get more out of this egf serum if used in the morning.

On damp, cleansed skin, apply a pea-sized amount to face and neck. Gently pat in.

Follow with

Treatments → moisturizer.

Finish with SPF in your AM routine.

INKEY Tip

Layer serums thinnest to thickest. Wait 60 seconds between layers to avoid pilling.

Heads up

Don’t mix with Retinol, AHAs, BHAs or PHAs in the same routine. Use Vitamin C in the AM, Retinol or Acids in the PM.When adding new products to your skincare routine, we always recommend patch testing. Learn more here.

Storage

Store in a cool, dry place (15–25°C). Keep out of direct sunlight. Avoid eyes. For external use only. Keep out of reach of children.

*4-week independent consumer trial of 64 people

• 15% Ascorbyl Glucoside (Vitamin C): Stable, effective Vitamin C that converts on skin to brighten and target sun damage and hyperpigmentation.
• 1% Epitensive™ (EGF Epidermal Growth Factor): Plant-based peptide that supports skin renewal and boosts elasticity. 

Aqua (Water/Eau), Ascorbyl Glucoside, Sodium Hydroxide, PEG-40 Hydrogenated Castor Oil, Phenoxyethanol, Benzyl Alcohol, Butylene Glycol, Xanthan Gum, Ethylhexylglycerin, Sodium Metabisulfite, Dehydroacetic Acid, Phytic Acid, Oligopeptide-1.

Epitensive™ is a trademark of Lipotrue and is used with permission 

HOW OFTEN SHOULD I USE VITAMIN C SERUM? For beginners: Start with 2-3 times per week in your morning routine. After 2 weeks, you can increase to daily use if your skin tolerates it well. Always follow with SPF as vitamin C can increase sun sensitivity.

SHOULD I USE VITAMIN C SERUM IN THE MORNING OR NIGHT? Morning is best! Vitamin C provides antioxidant protection against daily environmental damage from pollution and UV rays. Apply to clean skin, follow with moisturizer and SPF. This timing maximizes both protective and brightening benefits.

CAN I LAYER IT WITH OTHER ACTIVES? Don’t layer with exfoliating acids (AHAs, BHAs) or Retinol in the same routine. Alternate: Vitamin C in the AM, Retinol or acids in the PM. Learn how to layer skincare.

CAN I USE VITAMIN C SERUM WITH RETINOL? Yes, but not at the same time. Use vitamin C in your morning routine and retinol at night. This prevents any potential interaction while maximizing the benefits of both ingredients. Wait at least 12 hours between applications

CAN I USE IT WITH NIACINAMIDE? Yes - safe to layer with Niacinamide. But don’t mix with pure L-Ascorbic Acid.

DO I NEED TO WAIT BEFORE APPLYING OTHER PRODUCTS? If layering, give it 10 minutes before applying your next product to let EGF do its job.

IS IT SUITABLE FOR SENSITIVE SKIN? Yes - it’s a gentler Vitamin C. But always patch test. Learn more here

WHAT IS EGF? Epitensive™ is a plant-derived Epidermal Growth Factor. A plant-based peptide that supports skin renewal, elasticity and regeneration.

WHAT IS VITAMIN C SERUM? Vitamin C serums are brightening treatments that help fade dark spots, boost glow, and protect against environmental damage. Our 15% formula uses Ascorbyl Glucoside—a stable, gentle form of vitamin C perfect for sensitive skin and beginners to vitamin C skincare.

WHAT’S THE % OF EGF? 1% EGF.

WHAT’S THE PH? 6.8–7.2.

VITAMIN C VS EGF - WHAT’S THE DIFFERENCE? Vitamin C protects, brightens, and targets pigmentation. EGF boosts skin renewal and elasticity. Together? A power duo for brighter, smoother skin.

HOW IS THIS DIFFERENT TO YOUR 30% VITAMIN C? 30% Vitamin C uses pure L-Ascorbic Acid for experienced users. This 15% formula is gentler, beginner-friendly, and boosted with EGF.

WHAT IS THE BEST VITAMIN C SERUM FOR BEGINNERS? Our 15% Vitamin C + EGF Serum is specifically formulated for vitamin C beginners. Unlike harsh L-Ascorbic Acid formulas that can irritate, our stable Ascorbyl Glucoside provides effective brightening without burning or stinging. Start with 2-3 times per week and build up to daily use.

CAN I USE THIS VITAMIN C SERUM IF I HAVE SENSITIVE SKIN? Yes! This is one of the most gentle vitamin C serums available. Our Ascorbyl Glucoside is a stable, non-irritating form of vitamin C that's dermatologically tested for sensitive skin. Unlike pure L-Ascorbic Acid, it won't cause redness, stinging, or peeling. But always patch test. Learn more here

WHAT SKIN TYPES CAN USE THIS VITAMIN C SERUM? All skin types! Our gentle formula works for oily, dry, combination, and sensitive skin. Oily skin benefits from pore-refining effects, dry skin gets brightening hydration, and sensitive skin enjoys irritation-free vitamin C benefits.

WHY IS MY SERUM YELLOW? A light yellow tint is normal., the tint comes from the nature of the ingredients.

WHY HAS THE COLOUR CHANGED? Natural oxidation may cause colour shift but won’t affect safety or performance.

HOW SHOULD I STORE MY VITAMIN C SERUM? Store in a cool, dark place away from direct sunlight. Unlike unstable L-Ascorbic Acid formulas, our Ascorbyl Glucoside won't oxidize or turn brown. No refrigeration needed - room temperature is perfect for maintaining potency.

WHAT ELSE CAN I USE TO BRIGHTEN SKIN? Try our Fulvic Acid Cleanser alongside this serum. IS EGF SAFE? Yes. EGF is naturally found in the body. The amount here is tiny and safe for skin.

HOW LONG DOES IT TAKE TO SEE RESULTS FROM VITAMIN C SERUM? Most users see initial brightening within 2-4 weeks of consistent use. In our clinical studies, 87% of participants saw visible skin brightness improvement after 8 weeks. Dark spots and uneven tone typically take 6-12 weeks to fade significantly.

IS IT VEGAN? Yes - certified by The Vegan Society.

IS THIS VITAMIN C SERUM SAFE DURING PREGNANCY? Yes, vitamin C is considered safe during pregnancy and breastfeeding. Our formula contains no retinoids, salicylic acid, or other pregnancy-restricted ingredients. However, always consult your healthcare provider before starting any new skincare products. Find out more about pregnancy safe skincare.

CAN I USE WITH PRESCRIPTION PRODUCTS? Check with your doctor first.

Skincare can be confusing.

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This product is;

Dermatologically tested

Fragrance-free

Gluten-free

Paraben-free

Pregnancy & Breastfeeding safe