Dr. Althea: the Korean brand specializing in sensitive skin

The 345 Relief Cream is formulated primarily to soothe sensitive or reactive skin, with a focus on reducing redness and providing immediate comfort thanks to centella asiatica and niacinamide. The 147 Barrier Cream, on the other hand, targets skin with an impaired skin barrier: its formula, richer in ceramides, aims to rebuild the protective film in the long term.

In practice, both can coexist in a routine depending on the season or your skin's condition. The 345 is more suitable for daily use on generally sensitive skin. The 147 is preferable after prolonged exposure to cold, dermatological treatment, or a period of severe dehydration.

Yes, the 345 Relief Cream is frequently used in conjunction with retinol, precisely because its calming formula helps buffer the irritating effects of retinoic acid. The recommended order of application: retinol as an active treatment, then the 345 on top to moisturize and soothe.

Start with an application every two or three days if your skin is not used to retinol. Avoid directly layering the Vitamin C Boosting Serum and retinol on the same evening: reserve vitamin C for the morning and retinol for the evening to limit interactions.

The first comforting effects (less tight skin, reduced redness) are generally noticeable after 7 to 14 days of regular application for 345 and 147. For the Vitamin C Boosting Serum, evening out skin tone requires more patience: allow at least 4 to 6 weeks, with one application each morning.

Results vary depending on the initial skin condition, regularity of use, and associated sun protection. Vitamin C oxidizes in light: an SPF in the morning is essential to avoid nullifying its effect on the complexion.

The 345 Relief Cream and the 147 Barrier Cream can be used morning and night, after your serum or essence. There's no limit to how often you can use them: the more stressed your skin is, the more it benefits from regular barrier cream application.

The Vitamin C Boosting Serum should only be applied in the morning, before moisturizer and sunscreen. Avoid using it in the evening with other concentrated active ingredients like high-dose niacinamide or exfoliants: in most cases, it's well-tolerated, but layering active ingredients can sensitize reactive skin.

The 345 Relief Cream and the 147 Barrier Cream have a generally well-tolerated composition, without retinol or high-dose salicylic acid. However, the complete INCI list should be checked on a case-by-case basis with your doctor or midwife, as certain essential oils or preservatives may be inadvisable depending on the trimester.

The 20% Vitamin C Boosting Serum is generally considered safe during pregnancy, but consult a healthcare professional if you have any doubts, especially if you have sensitive skin or a particular medical history.