Kiehl's Vitamin C Line Reducing Serum – 100ml

Kiehl’s Powerful-Strength Line-Reducing Concentrate is a vitamin C serum aimed at dullness, uneven texture, and the look of fine lines. The texture is light and layers easily, so it slots into an existing routine without complicating it.

What sets this serum apart is its vitamin C concentration — a clinically meaningful level that delivers visible results, not just trace amounts. At 100ml it’s a notably generous size for a vitamin C serum, which usually comes in 30ml bottles, making it better value for consistent, long-term use.

Key Ingredients

• 10.5% Pure Vitamin C (Ascorbic Acid) — A clinically active concentration of stabilized vitamin C that visibly brightens, evens skin tone, and stimulates collagen production to reduce the appearance of fine lines over time.
• 2% Vitamin Cg (Ascorbyl Glucoside) — A gentler, more stable derivative of vitamin C that complements pure ascorbic acid, extending antioxidant protection and brightening benefits throughout the day.
• Hyaluronic Acid — Keeps skin hydrated and plump while the vitamin C actives work, preventing the tight or dry feeling that some vitamin C serums can cause.
• Squalane — A lightweight, skin-identical emollient that softens skin texture and helps the formula absorb smoothly without greasiness.

Product Highlights

• Skin looks brighter and more radiant from consistent use
• Softens the appearance of fine lines and surface texture
• Antioxidant protection against daily environmental stressors
• Lightweight formula — layers cleanly under moisturizer and SPF
• Generous 100ml / 3.4oz bottle — 3x the standard serum size

How to Use

Apply to clean, dry skin in the morning, avoiding the immediate eye area. Follow with moisturizer, then a broad-spectrum SPF 30+ — vitamin C and daily sunscreen work synergistically to protect and brighten. Can also be used in the evening; if so, follow with your usual moisturizer.

FAQ

Morning or evening?
Morning is ideal — vitamin C provides antioxidant protection during the day and works best paired with sunscreen. Evening use is also effective if preferred.

Can I use it with retinol?
Yes, but not at the same time. Use vitamin C in the morning and retinol at night to avoid potential irritation from layering both.

Will it irritate sensitive skin?
The 10.5% concentration is active but well-tolerated by most skin types. If you have very sensitive skin, start with every other day and build up.

Can I wear makeup over it?
Yes. Let it absorb for a minute, then apply moisturizer, SPF, and makeup as usual.

Size: 100ml / 3.4oz