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Vitamin C

3 Products

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Clearly Corrective Dark Spot Solution 30ml bottle.

A person applying Clearly Corrective Dark Spot Solution to their skin.

Bottle of Clearly Corrective Dark Spot Solution with text: Visibly Reduces Dark Spots and Hyperpigmentation.

Graphic showing key ingredients: Activated C, Buffered Salicylic Acid, and Proxylane.

Clearly Corrective Dark Spot Correcting Serum

A face dark spot corrector and brightening serum that helps visibly reduce dark spots, hyperpigmentation, and post-acne marks.

23% Off

Old price €86.00 New price €66.22

A 75ml bottle of Kiehl's Powerful-Strength Line-Reducing Concentrate against a white background.

A close-up of Powerful-Strength Line-Reducing Concentrate texture swipe. Text highlights its ability to reduce fine lines, improve texture, and suitability for all skin types.

Powerful-Strength Line-Reducing Concentrate

A potent anti-wrinkle serum formulated with 12.5% Vitamin C and Hyaluronic Acid.

Old price New price €125.00

Bottle of Kiehl's Facial Fuel Energizing Moisture Treatment for Men

Model with Facial Fuel Energizing Moisture Treatment for Men on face

Facial Fuel Energizing Moisture Treatment for Men

A lightweight daily moisturiser for men powered by Caffeine, Vitamin C, Vitamin E and Chestnut Extract. Benefits: energises tired-looking skin, strengthens the skin barrier, provides long-lasting hydration and helps control shine. Suitable for all skin types.

15% off

Old price €35.00 New price €29.75

Frequently Asked Questions

Which Kiehl's vitamin C serum is right for my skin concern?

It depends on what you are looking to address. If your main concern is fine lines and firming, we recommend our Powerful-Strength Line-Reducing Concentrate, which features stabilised 12.5% Vitamin C alongside Hyaluronic Acid. If you are focused on dark spots and uneven skin tone, our Clearly Corrective Dark Spot Solution is formulated with Activated C to help visibly reduce discolouration.

How long does it take to see results from a vitamin C serum?

Most people begin to notice visible improvements in skin brightness and tone within 4 to 8 weeks of consistent daily use. Vitamin C serum works gradually, so the key is making it a regular part of your routine rather than expecting overnight changes. For best results, apply it every morning before your moisturiser and broad-spectrum SPF.

Can I use the Kiehl's Powerful-Strength Line-Reducing Concentrate every day?

Yes, our Powerful-Strength Line-Reducing Concentrate is designed for daily use as part of your morning and evening skincare routine. Its stabilised 12.5% Vitamin C formula balances efficacy with tolerability, so it is suitable for everyday application. We recommend starting with once a day if your skin is new to vitamin C serum, then building up to twice daily as your skin adjusts.

What Does Vitamin C Serum Do for Your Face?

Vitamin C serum delivers powerful antioxidant protection while helping to brighten skin, reduce the appearance of fine lines, and fade dark spots. It works by neutralising free radicals from environmental stressors like pollution and UV exposure, which can accelerate visible signs of ageing. We recommend pairing your vitamin C serum with a broad-spectrum SPF for maximum protection.

Can I Use Vitamin C Serum With Retinol?

Yes, you can absolutely use vitamin C serum alongside retinol, though we recommend applying them at different times of day. Vitamin C works best in the morning to protect against environmental damage, while retinol is typically more effective in your evening routine. Our Retinol Skin-Renewing Daily Micro-Dose Serum pairs beautifully with a morning vitamin C application.

Should I Apply Vitamin C Serum Before or After Moisturiser?

Apply your vitamin C serum before moisturiser, as serums have smaller molecules that penetrate best when applied directly to clean, slightly damp skin. After your serum has absorbed (typically 30 seconds to a minute), follow with your moisturiser to lock in hydration. This layering order ensures your vitamin C serum can work effectively without any barriers.

Can Vitamin C Serum Cause Irritation?

Some people may experience mild tingling when first introducing vitamin C serum to their routine, particularly with higher concentrations or if you have sensitive skin. This is typically normal and tends to subside as your skin adjusts over the first week or two. If irritation persists, we recommend starting with every other day application and gradually building up to daily use.

Does Vitamin C Serum Help With Acne Scars?

Yes, vitamin C serum can help fade the appearance of post-acne marks and hyperpigmentation by inhibiting excess melanin production. Consistent daily use over several weeks typically yields the most noticeable improvements in skin tone and texture. For targeted dark spot correction, our Clearly Corrective Dark Spot Solution is formulated specifically to address discolouration.

Can I Use Vitamin C Serum With Hyaluronic Acid?

Yes, vitamin C and hyaluronic acid make an excellent pairing and can be used together in the same routine. Vitamin C provides antioxidant protection and brightening benefits, while hyaluronic acid delivers deep hydration. Our Powerful-Strength Line-Reducing Concentrate actually combines both ingredients, featuring stabilised 12.5% Vitamin C alongside Hyaluronic Acid.

Can I Use Vitamin C Serum With Niacinamide?

Yes, despite older advice suggesting otherwise, vitamin C serum and niacinamide work well together and can be layered in the same routine. Both ingredients offer complementary benefits for brightening and improving skin texture. If you prefer to use them separately, apply your vitamin C serum in the morning and your niacinamide serum in the evening.