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Anti-aging facial serum with 12.5% Vitamin C, a wrinkle-reducing serum that provides long-lasting antioxidant action (preventing damage and aging), and stimulates collagen and elastin production (most active at night). A targeted facial treatment that minimizes wrinkles and fine lines, restores radiance, and improves skin texture.
For all skin types. WATER-FREE, ALCOHOL-FREE, COLOR-FREE, PARABEN-FREE, FRAGRANCE-FREE
This facial serum contains: Vitamin C 10.5% (L-ascorbic acid): Maximum recommended percentage of vitamin C for sensitive skin, Ascorbyl Glucoside – Vitamin Cg: 2%, Fragmented Hyaluronic Acid: reduces roughness and minimizes the appearance of deep wrinkles through deep hydration.
It can be used day and night, avoiding the eye contour.
The sensation of softness and radiance is immediate. Using this product mitigates the harmful effects of free radicals through its antioxidant action.
The lists of ingredients contained in product composition are updated regularly. Consult the list of ingredients on the packaging before using the product.
Brand Safety Warning
In case of contact with eyes, rinse immediately and thoroughly with water.
I bought this product several months ago and I haven’t finished the bottle. I don’t think it’s bad, but at least on my combination skin, it causes quite a few breakouts due to its texture. I prefer serums with liquid formulations.
Comment made on sample product
Translated by Google
Gender: Woman
Age: ---
Country: España
Has been using this product for: Not specified
Skin Type:
Mixed
RAQUEL recommends this product
Elisabet
08/05/2025
For me it’s a redundant NO
I’ve been trying it for a couple of weeks now, and obviously I don’t have a clear opinion yet, but what I do know is that the texture is incredibly greasy (I have dry skin... imagine what it’s like on normal or oily skin) and very, very sticky. The feeling on my face is very unpleasant. I’m trying to use it at night because I feel bad leaving it in a drawer, given the price. I hope it’s at least miraculous! :)
Comment made on sample product
Translated by Google
Gender: Woman
Age: ---
Country: España
Has been using this product for: Not specified
Skin Type:
Normal
Elisabet recommends this product
César
09/04/2025
Fantastic
I’ve been using it for over 6 years. My skin is combination and sensitive. It’s the best thing I’ve ever used. I always recommend it. It might seem expensive, but you don’t need to use too much. A 75ml bottle lasts me more than 6 months. My skin looks much clearer.
Comment made on sample product
Translated by Google
Gender: ---
Age: ---
Country: España
Has been using this product for: Not specified
Skin Type:
César recommends this product
María Jesús
29/03/2025
Perfect!
I’ve been using it for several years and the results are incredible. I think you’ve improved the formula and especially the texture; my skin feels hydrated throughout the day after using it. It’s also worth noting that it lasts up to 6 months once opened.
Comment made on sample product
Translated by Google
Gender: Woman
Age: ---
Country: España
Has been using this product for: Not specified
Skin Type:
Dry
María Jesús recommends this product
Mariadelmar
06/03/2025
Luminous and silky
The texture feels silky smooth on the skin. It leaves the skin luminous and nourished. And after applying it, it feels like soft, flawless silk.
Comment made on sample product
Translated by Google
Gender: Woman
Age: ---
Country: España
Has been using this product for: Not specified
Skin Type:
Dry
Mariadelmar recommends this product
Elvira 34
23/02/2025
Very sticky texture
I don’t like the texture of the serum; when I applied it, I had to wash my hands several times to remove the remaining product.
What benefits does Kiehl's Powerful-Strength Line-Reducing offer?
Translated by Google
-25/03/2026
It is the ultimate illuminating ally that guarantees: • Much firmer, smoother and rejuvenated skin. • Visible improvement in pores and skin texture. • Antioxidant protection against free radicals.
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How should this Vitamin C serum be stored?
Translated by Google
-26/02/2026
To maintain its effectiveness, it is recommended to store it in a cool, dark place, making sure to close the container tightly to prevent the formula from oxidizing.
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Is it normal to feel heat when applying Powerful-Strength Vitamin C?
Translated by Google
-12/01/2026
Yes, this is a common reaction to pure vitamin C coming into contact with the skin. This warming sensation indicates that the product is being activated correctly.
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How does Kiehl's Powerful-Strength Line-Reducing work?
Translated by Google
-15/11/2025
Formulated with 12.5% Vitamin C and Hyaluronic Acid, this concentrate helps to visibly reduce wrinkles while improving skin radiance.
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