ISDIN Flavo-C Intense Antioxidant Serum 50 ml

When should you use this vitamin C serum to boost your skin’s radiance?

ISDIN Flavo-C Intense is a two-phase serum from the Isdinceutics line, containing a 15% concentration of vitamin C. It combines three complementary forms of this vitamin: L-ascorbic acid, its pure form; 3-O-ethyl ascorbic acid, a more stable water-soluble derivative; and ascorbyl tetraisopalmitate, a fat-soluble derivative. The formula also includes tocopherol (vitamin E), hinokitiol, levulinic acid, and two forms of hyaluronic acid. The two phases, kept separate in the bottle, mix in the palm of the hand upon application.

Vitamin C and vitamin E are antioxidants capable of neutralizing free radicals—unstable molecules that form, in particular, as a result of UV exposure and pollution. Their combination gives the formula a powerful antioxidant effect that enhances radiance: the serum brightens the skin. In a 112-day study involving 35 people aged 40 to 70 with all skin types, skin radiance increased by 53%.

Vitamin C also helps improve skin tone evenness and the appearance of wrinkles. When applied daily, the serum helps even out the complexion and reduce the appearance of wrinkles: in the same study, skin tone evenness improved by 42%, wrinkles decreased by 31%, and firmness increased by 13%. Hyaluronic acid rounds out the formula by hydrating the skin’s surface. The serum is one of a line of anti-aging serums designed for daily use.

Flavo-C Intense is intended for dull complexions and skin showing the first signs of aging: wrinkles, lack of radiance, and an uneven complexion. It has been tested on all skin types, including sensitive skin, and under ophthalmological supervision. It integrates seamlessly into a daily anti-aging routine, regardless of which moisturizer is used afterward.

Vitamin C does not filter UV rays: it complements sun protection without replacing it. For this, we recommendIsdin Fotoprotector Fusion Water Magic SPF50, a water-based facial sunscreen applied once the serum has been absorbed. The sunscreen reduces UV exposure, while the serum enhances the complexion’s radiance: the two steps complement each other.

How do you apply this two-phase serum?

Directions for Use

Each day, dispense two pumps into the palm of your hand and mix the two phases until the color is uniform. Apply a thin layer to a clean, dry face, then finish by gently patting until fully absorbed. Follow with sunscreen during the day.

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Precautions

• For external use only. Do not ingest.
• Avoid contact with the eyes and mucous membranes. In case of contact, rinse thoroughly with water.
• Do not apply to broken, irritated, or sunburned skin, or immediately after a dermatological procedure (such as a peel or laser treatment) without the practitioner’s approval.
• Do not use if you have a known allergy to any of the ingredients, particularly sulfites: the formula contains sodium metabisulfite. It also contains fragrance.
• If you have sensitive skin, test the product on a small area 48 hours before applying it to your entire face for the first time. A mild, temporary tingling sensation may occur; discontinue use if redness, a burning sensation, or persistent itching develops.
• A brown spot that changes in size, shape, or color, or that bleeds or itches, requires medical attention rather than a radiance-boosting serum.
• Close the bottle tightly after use; store away from heat and light. Keep out of reach of children.

What are the ingredients in this 15% vitamin C serum?

Ingredients

Propylene Glycol, Aqua (Water), Alcohol Denat., Dimethicone, 3-O-Ethyl Ascorbic Acid, Ascorbyl Tetraisopalmitate, Ascorbic Acid, Tocopherol, 1,2-Hexanediol, Hydroxyacetophenone, Levulinic Acid, Parfum (Fragrance), Sodium Metabisulfite, Hydrolyzed Hyaluronic Acid, Sodium Hyaluronate, Tetrasodium Glutamate Diacetate, Hinokitiol, CI 19140 (Yellow 5).

Product Details

50 ml two-phase pump bottle, providing approximately four months of daily use.

Our Expert Advice on Flavo-C Intense for a Radiant Complexion

The question we’re asked most often at the counter is about how long it takes to see results. A more radiant complexion is often visible within the first few weeks; however, achieving an even skin tone and reducing the appearance of wrinkles takes longer: the measurable results of this serum were observed after nearly four months—the duration of one bottle. Therefore, a serum of this type should be evaluated based on a full bottle used continuously, not after just a few applications.

Mixing the two phases is the key step that determines everything. If the color still appears marbled in the palm of your hand, it means the vitamin C hasn’t been fully distributed: a few more seconds of blending with your fingertips is all it takes. As part of your routine, apply the serum before your moisturizer, never on top of it: its fluid texture doesn’t absorb well through a rich moisturizer.

FAQ

Should ISDIN Flavo-C Intense be used in the morning or at night?

Morning is the most logical time: apply the serum under sunscreen, before exposure to light and pollution. You can also apply it in the evening, but it shouldn’t replace your morning routine.

Can I use ISDIN Flavo-C Intense with a retinol serum?

Yes, but at different times. Vitamin C is best used in the morning, while retinol or retinal is best used in the evening. Layering the two in the same routine increases the risk of tingling, especially during the first few weeks of using a retinoid.

Why is ISDIN Flavo-C Intense yellow?

The color comes partly from a dye listed in the ingredients: tartrazine (CI 19140). Once the two phases are thoroughly mixed, the serum takes on a uniform color. Do not use a bottle whose contents have noticeably darkened over the months or that has an unusual odor.