Powerful-Strength Vitamin C Serum

If you want vitamin C at a serious concentration, Kiehl's Powerful-Strength Vitamin C Serum is exactly what the name promises: 12.5% vitamin C paired with hyaluronic acid. It's a radiance and firmness serum aimed at fine lines, rough texture and skin that's starting to lose its bounce.

What it actually does

• Delivers a double dose of vitamin C. 10% pure vitamin C to soften the look of fine lines and refine texture, plus ascorbyl glucoside — a gentler derivative — to reinforce the effect.
• Pairs the actives with hyaluronic acid to smooth how skin looks and feels, rather than leaving it tight the way strong actives sometimes do.
• Boosts radiance and visible firmness. Kiehl's positions this as its serum for dullness, wrinkles and enlarged-looking pores — skin that reads smoother overall.
• Suits every basic skin type. The brand lists it for normal, dry, combination and oily skin.

How to use

1. After cleansing, smooth two pumps across the face, keeping well clear of the eye area.
2. Expect a brief sensation of warmth as it absorbs — Kiehl's notes this is the formula activating, not a reaction.
3. Begin with once a day and build up to morning and evening as your skin adjusts.
4. In the daytime, always follow with a sunscreen.
5. If it gets into your eyes, rinse immediately.

Is it right for you?

Questions

Why does my face feel warm after applying it?

That warmth is expected with this particular formula — Kiehl's describes it as the serum activating as it blends in. It should be brief and mild. If you ever get real stinging or redness, stop and reassess.

Morning or night?

Both, eventually — the brand suggests starting once daily and working up to twice. If you use it in the morning, a sunscreen on top is non-negotiable.

How long does delivery take?

Delivery takes 3 to 21 working days, depending on availability — faster for items already in stock, longer for items we bring in to order.

What payment methods do you accept?

Credit card, debit card, Instapay and mobile wallets. We don't offer cash on delivery.

Can I return it if I change my mind?

No — returns are for defective, damaged or expired items only, and must be reported within 1 day of delivery. Verified refunds go back to the original payment method within 15–30 days.