Can a simple moisturiser help protect your brain? It sounds unlikely, but a growing body of research is establishing the skin-brain axis as a serious frontier in the science of ageing. As our skin barrier deteriorates with age, it releases pro-inflammatory cytokines into the bloodstream — contributing to the chronic, low-grade inflammation known as “inflammaging.” These circulating cytokines can cross the blood-brain barrier and drive neuroinflammation, potentially accelerating cognitive decline.

A landmark three-year randomised trial, published in the Journal of the European Academy of Dermatology and Venereology (Ye et al., 2022), tested whether repairing the skin barrier with a topical emollient could slow this process. The cream used was Atopalm® — a formulation whose technical design deserves close attention from anyone developing products for elderly or sensitive skin.

The Evidence: What the Trial Found

The study was a randomised, open-label pilot trial conducted across two cities in northern China. Two hundred participants aged 65 and over were assigned equally to a treatment group or an untreated control group. Those in the treatment group applied Atopalm cream twice daily during the winter months (November to May) for three consecutive years. Cognitive function was assessed using the Global Deterioration Scale (GDS), while skin barrier parameters including transepidermal water loss (TEWL), stratum corneum hydration, and skin surface pH were measured on the forearms and shins.

The cognitive results were striking:

• GDS scores in the control group increased significantly over the three years (P < 0.0001), indicating progressive cognitive decline. In the treated group, GDS scores stabilised.
• Only 3 participants in the treated group progressed from mild cognitive impairment to mild dementia, compared with 10 progressing to mild dementia and 12 to moderate dementia in the controls.
• The prevalence of cognitive impairment in the control group rose from 79% to 95% by the trial’s end (P = 0.0031).

The skin barrier data told a parallel story:

• TEWL increased significantly in the untreated controls, reflecting ongoing barrier deterioration.
• In the treated group, stratum corneum hydration increased (P < 0.0001) and skin surface pH decreased toward healthier levels (P < 0.0001).

The authors were careful to note the study’s limitations: the sample size was relatively small, the design was open-label rather than blinded, and larger cohort trials are needed to validate the findings. Nevertheless, the data suggest a meaningful link between skin barrier repair and cognitive stability in the elderly.

Supporting Evidence

The Ye et al. trial did not emerge in isolation. An earlier 2019 pilot by the same research group (Ye et al., PMID 30835878) had already demonstrated that the same emollient reduced circulating levels of pro-inflammatory cytokines in aged humans after just 30 days of twice-daily application. This provides the mechanistic bridge: improving the skin barrier lowers systemic inflammation.

Independently, data from the Baltimore Longitudinal Study of Aging (published in the Journal of Investigative Dermatology, 2025) found that poorer skin barrier function — measured by TEWL area under the curve — was associated with faster declines in verbal memory over a ten-year period. Verbal memory decline is one of the earliest markers of cognitive deterioration. This second, independent line of evidence strengthens the case that the skin-brain axis is not just a theoretical concept but a measurable clinical reality.

The Science of Inflammaging

As we age, the epidermal permeability barrier naturally thins. Stratum corneum hydration decreases, TEWL increases, and skin surface pH rises. This is not merely a cosmetic issue. A compromised barrier increases the production of pro-inflammatory cytokines — including IL-1α, IL-1β, IL-6, and TNF-α — in the skin, which then enter the bloodstream.

Because the skin is the body’s largest organ, even modest elevations in cutaneous cytokine production can translate into significant systemic inflammatory burden. These circulating cytokines can downregulate tight junction proteins in the brain’s endothelial cells, increasing blood-brain barrier permeability and allowing inflammatory mediators to trigger neuroinflammation. The result: a pathway from skin barrier dysfunction to cognitive decline, mediated by chronic low-grade inflammation.

A Formulator’s Review: The Atopalm Design

While the clinical trial tested the complete Atopalm formulation rather than individual ingredients, the product’s technical design offers valuable lessons for formulators developing products for elderly or barrier-compromised skin.

Multi-Lamellar Emulsion (MLE) Technology

Atopalm uses a patented Multi-Lamellar Emulsion system. Unlike conventional oil-in-water emulsions that deposit simple droplets on the skin surface, MLE mimics the lamellar lipid architecture of the healthy stratum corneum. The emulsion integrates directly into the intercellular lipid matrix, reinforcing the barrier rather than simply occluding it.

The formulation also incorporates amino acids — building blocks of the skin’s Natural Moisturising Factors (NMFs) — supporting the skin’s intrinsic hydration mechanisms rather than relying solely on surface-level moisturisation.

The broader principle for formulators: the concept of matching the skin’s lamellar lipid structure is not exclusive to MLE technology. Physiological lipid ratios (ceramides, cholesterol, and free fatty acids), liquid crystal emulsifiers, and lamellar gel network systems all work on the same principle of barrier integration rather than occlusion. For elderly skin, where the barrier is structurally compromised, this approach is likely to be more effective than conventional emollients.

The Preservation System: Gentle and Functional

Perhaps the most interesting aspect of the Atopalm formula for cosmetic chemists is its preservative strategy. In an elderly population, skin is often hypersensitive, thin, and prone to irritation — precisely the conditions where traditional preservatives are most problematic.

Atopalm uses a multifunctional glycol-based system including 1,2-Hexanediol, Pentylene Glycol, Butylene Glycol, and Propanediol. This approach works on multiple levels:

• Preservation through water activity reduction: These glycols lower the water activity (Aw) of the formula, creating conditions inhospitable to microbial growth without relying on conventional biocides. This preservation-boosting mechanism reduces the need for harsher antimicrobial agents.
• Dual functionality — humectancy and preservation: Unlike traditional preservatives that serve only an antimicrobial purpose, these glycols are also humectants. They actively draw moisture into the skin, meaning the preservation strategy simultaneously contributes to the product’s hydrating efficacy. For elderly skin, this dual benefit is particularly valuable.
• Low irritation profile: For thin, barrier-compromised skin, minimising irritation potential is critical. A glycol-based system provides the necessary shelf-life stability while remaining well-tolerated, helping to keep the skin calm and reduce the inflammatory burden associated with barrier dysfunction.

The Bottom Line

The link between the skin and the brain is a powerful reminder that the body is a connected system. For the elderly, skincare is no longer just about comfort or cosmetics — it may be a prophylactic measure against systemic inflammation and its downstream consequences, including cognitive decline.

For formulators, the message is clear: products designed for ageing skin should prioritise genuine barrier repair over superficial moisturisation, and preservation systems should be chosen not just for efficacy but for tolerability. Barrier-identical lipid structures and gentle, glycol-based preservation represent a formulation philosophy that supports both skin integrity and, potentially, broader systemic health.

For formulators looking to explore gentle preservation systems suitable for sensitive and elderly skin, detailed ingredient profiles including supplier data, regulatory status, and efficacy evidence are available on Green Chem Finder Compendium

References

Ye L, Wang Z, Kim Y, Elias PM, et al. “A topical emollient mitigates the progression of cognitive impairment in the elderly: a randomized, open-label pilot trial.” J Eur Acad Dermatol Venereol. 2022;36(8):1382-1388. doi: 10.1111/jdv.18162. PMID: 35442543.

Ye L, Mauro TM, Dang E, et al. “Topical applications of an emollient reduce circulating pro-inflammatory cytokine levels in chronically aged humans: a pilot clinical study.” J Eur Acad Dermatol Venereol. 2019;33(11):2197-2201. doi: 10.1111/jdv.15540. PMID: 30835878.

Baltimore Longitudinal Study of Aging. “Skin Barrier Function and Cognition among Older Adults.” J Invest Dermatol. 2025. doi: 10.1016/j.jid.2022.11.027.

Man MQ, Elias PM. “The link between cutaneous inflammation and cognitive impairment.” J Eur Acad Dermatol Venereol. 2022. PMID: 35748522.

By Dr Barbara Olioso, MRSC, is a green chemist with over 25 years’ experience in cosmetic science, specialising in green preservation and sustainable formulation. A member of the Society of Cosmetic Scientists and author of The Green Chemist’s Handbook for Cosmetic Preservation, she created GreenChem Finder to help formulators make informed, data-driven ingredient choices. She regularly contributes to industry events and publications including in-Cosmetics Global, COSSMA and SOFW.