Skincare After 40 — the Ingredients That Truly Work on Mature Skin

By the age of 40, the skin has already lost more than 30% of its collagen reserves — according to data published in the American Journal of Pathology (Varani et al., 2006). It is not only the quantity that changes, but also the quality: collagen fibres become stiffer, more densely packed and less elastic. At the same time, the ratio of ceramides in the stratum corneum shifts — the share of ceramides 1 and 3, which keep the lipid barrier sealed, declines. This explains why skin after 40 is more often dry, less firm and slower to regenerate.

Peptides — molecular signalling instead of "repair"

Peptides are short chains of amino acids that act as signalling messengers in cosmetic science. They do not "build" collagen directly, but they send fibroblasts a signal to step up production. The best-researched ones include:

Matrixyl 3000 (palmitoyl tripeptide-1 + palmitoyl tetrapeptide-7)

A clinical study conducted by Sederma (the manufacturer) on 35 volunteers showed a 36% reduction in wrinkle depth after 2 months of use. Matrixyl 3000 stimulates the synthesis of collagen I, III and IV, as well as fibronectin. Keep in mind that the study was sponsored by the manufacturer — even so, matrikine peptides have the most extensive clinical documentation among cosmetic peptides.

Copper peptides (GHK-Cu)

The GHK tripeptide in complex with copper has demonstrated, in in-vitro studies, the ability to stimulate the production of collagen, elastin and glycosaminoglycans. A study by Pickart et al. (International Journal of Cosmetic Science, 2012) suggests efficacy comparable to 0.05% retinol in reducing fine lines, although the body of evidence is still limited.

Retinol — time to raise the concentration

If your skin tolerated 0.25–0.3% retinol in your thirties, after 40 it is worth considering a step up to 0.5%. A study by Kang et al. (Journal of Investigative Dermatology, 2005) showed that 0.4% retinol applied three times a week for 24 weeks significantly increased procollagen I expression and reduced the activity of matrix metalloproteinases (MMPs), the enzymes that break down collagen.

An alternative for those with sensitive skin is retinal (retinaldehyde) — a form just one conversion step away from retinoic acid, yet better tolerated than pure tretinoin. Check products containing retinol in the PurScore search engine to compare concentrations and forms.

Ceramides — rebuilding a barrier that is breaking down

Research by Imokawa et al., published in the Journal of Lipid Research, showed that the concentration of ceramides in the stratum corneum falls by 30% between the ages of 20 and 40. The consequence: increased transepidermal water loss (TEWL), dryness, a tendency towards irritation and a weakened response to active ingredients.

Look for creams containing ceramides in a ratio close to the natural one: ceramides : cholesterol : free fatty acids in a 3:1:1 ratio. This proportion, described in studies by Mao-Qiang et al., supports lipid-barrier regeneration most effectively. Many commercial formulas include ceramides "for show" — in amounts too small to matter.

AHAs — controlled exfoliation for better texture

After 40, the skin's renewal cycle lengthens to 40–55 days. AHAs (alpha-hydroxy acids) speed up this process:

• Glycolic acid 8–10% — the smallest AHA molecule, it penetrates the deepest. Use 2–3 times a week in the evening.
• Lactic acid 10–12% — gentler, and it also supports hydration (boosting the production of the skin's own epidermal ceramides). A better choice for dry skin.
• Mandelic acid 10% — the largest AHA molecule, with surface-level action, ideal for skin prone to broken capillaries.

A study published in Dermatologic Surgery (Stiller et al., 1996) confirmed that 8% glycolic acid used for 22 weeks significantly improved the texture, tone and overall condition of photodamaged skin.

Neck and decolletage — the zones that give away your age

The skin of the neck has fewer sebaceous glands, a thinner fat layer and is subjected to constant bending movements. The decolletage, in turn, is exposed to UV radiation for most of the year. After 40, neglecting these areas becomes visible:

• Every product you apply to your face should also reach your neck and decolletage — retinol, vitamin C, SPF.
• Apply cream to the neck using upward strokes — do not pull the skin downwards.
• Give the decolletage its own dedicated SPF application — this zone is often overlooked.

Hyaluronic acid — hydration deep down and on the surface

After 40, the skin's natural reserves of hyaluronic acid decline. Topical supplementation helps, but the form matters:

• High-molecular-weight HA (>1000 kDa) — forms a hydrating film on the skin's surface.
• Low-molecular-weight HA (20–200 kDa) — penetrates deeper, supporting hydration of the dermis.
• The best formulas combine both fractions.

Read more about combining hyaluronic acid with other active ingredients in the guide to active ingredients.

What to avoid after 40?

• Drastic weight-loss diets — rapid weight loss "empties" the face of its subcutaneous fat tissue, which deepens wrinkles more than the mere passage of time.
• Washing your face with hot water — it damages an already weakened lipid barrier. Use lukewarm water instead.
• Products with alcohol denat. high on the INCI list — they dry out and irritate skin that needs strengthening, not aggression.

Analyse product formulations before you buy — the PurScore ingredient database will tell you which cosmetics contain ceramides and peptides in effective forms, and which merely advertise them.