Moisturizing, anti-aging, purifying or even illuminating, cosmetic treatments owe their effectiveness to their active ingredients. These key ingredients, sometimes very concentrated, act directly on the skin. While most can be combined without risk, certain combinations are known to weaken the epidermis, cause irritation, inflammation or render treatments ineffective. Deciphering the mixtures to ban from your beauty routine.
Cosmetic active ingredients: what are we really talking about?
A cosmetic active ingredient is the ingredient responsible for the main action of a treatment. Comparable to the active ingredient of a medication, it gives the product its targeted properties: moisturizing, anti-wrinkle, antioxidant, soothing or purifying for the face; slimming, circulatory or deodorant for the body. Of natural, synthetic or biotechnological origin, the active ingredient is essential to the effectiveness of a cosmetic… provided it is used correctly.
Vitamin C and exfoliating acids: a risky duo
Star of radiance and anti-aging treatments, vitamin C (or ascorbic acid) helps smooth the skin, reduce pigmentation spots and boost the radiance of the complexion. But it doesn’t go well with powerful exfoliating acids like AHAs, glycolic acid or salicylic acid. Used together, these active ingredients can irritate the skin and reduce the effectiveness of vitamin C, which becomes unstable in contact with acids.
Retinol and strong acids: watch out for overdose
Retinol, derived from vitamin A, is one of the most effective anti-aging active ingredients. It stimulates cell renewal, refines skin texture and reduces wrinkles and imperfections. But already potentially irritating alone, it becomes problematic when combined with glycolic or salicylic acid. Result: redness, dryness, tightness, even swelling, especially on sensitive skin.
DHA and proteins: compromised effectiveness
Present in self-tanners, DHA reacts with proteins in the surface layer of the skin to create the tanned effect. The problem ? If it is applied with a treatment rich in proteins, it will react with the latter instead of those of the epidermis. No danger for the skin, but a much less effective self-tanner.
Hyaluronic acid, the universal ally
Good news: hyaluronic acid is a good performer. Ultra-hydrating and protective, it helps fight skin dryness, loss of elasticity and dull complexion. Even at high concentration, it is compatible with all other active ingredients, including exfoliating acids. A safe ingredient, to integrate without hesitation into your daily routine.
To remember : in cosmetics, more is not always better. It is better to space out the use of certain powerful active ingredients or apply them at different times of the day to avoid skin reactions and take full advantage of their benefits.