Retinol, hyaluronic acid, niacinamide: understanding anti-aging active ingredients

On skincare product labels, active ingredient names multiply and often look alike. Without cosmetology training, it's difficult to know which one truly meets your needs. This article reviews the most common anti-aging active ingredients, how they work, and the precautions to be aware of.

Retinol

Retinol is a form of vitamin A known for stimulating cell renewal and collagen production. It works deeply on skin texture and the appearance of fine wrinkles.

Who is it for? Mature skin, or those looking to prevent the first signs of aging.

Precautions: Retinol can be irritating when first used. It is recommended to introduce it gradually (2 to 3 times a week initially) and always apply sunscreen the next morning, as the skin is more sensitive to light after application.

Hyaluronic Acid

Naturally present in the skin, hyaluronic acid is a molecule capable of retaining up to 1000 times its weight in water. When applied in skincare, it acts as a hydration reservoir, visibly plumping the skin and temporarily reducing the appearance of dehydration lines.

Who is it for? All skin types, including sensitive skin. It is one of the best-tolerated active ingredients on the market.

Precaution: Hyaluronic acid hydrates but does not "nourish" the skin with lipids. It is often recommended to combine it with an occlusive cream to seal in hydration, especially in dry climates.

Niacinamide (Vitamin B3)

Niacinamide is a versatile active ingredient: it regulates sebum production, reduces the appearance of pores, evens skin tone, and strengthens the skin barrier. It is particularly appreciated for its excellent tolerance profile.

Who is it for? Combination to oily skin, acne-prone skin, or simply for a general "healthy glow" effect.

Precaution: No major contraindications. It is one of the few active ingredients that can be combined with almost all others, including retinol.

Vitamin C

A powerful antioxidant, vitamin C helps fight against the effects of oxidative stress (pollution, UV) responsible for premature skin aging. It is also known for its brightening and unifying effect on the complexion.

Who is it for? Dull skin, hyperpigmentation, uneven skin tone.

Precaution: Vitamin C is an unstable molecule, sensitive to light and air. Opt for opaque and airtight containers, and store the product away from direct light.

Centella Asiatica

Derived from traditional Asian medicine, Centella Asiatica (also called "tiger grass") is known for its soothing and restorative properties. It helps calm irritation and strengthen the skin barrier.

Who is it for? Sensitive, reactive skin, or skin damaged by the use of exfoliating active ingredients.

Glycolic Acid

A member of the AHA (alpha-hydroxy acid) family, glycolic acid exfoliates the skin's surface by dissolving the bonds between dead cells. It promotes a brighter complexion and smoother texture.

Who is it for? Dull skin, marked by spots or irregular texture.

Precaution: Like retinol, glycolic acid increases photosensitivity. Sun protection is essential after its use.

How to combine these active ingredients?

Some active ingredients combine very well (niacinamide + hyaluronic acid, for example), others require more caution (retinol + glycolic acid can over-irritate the skin if used simultaneously).

If in doubt about a combination, our advice remains the same: introduce one new active ingredient at a time, observe your skin's reaction for one to two weeks, then adjust your routine gradually.

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