The science
What the evidence supports. And what it doesn’t.
A plain-language summary for skin through perimenopause and menopause — referenced, and reviewed before anything changes.
Schematic illustration, not to scale.
03 / 04
Collagen
Skin collagen has been reported to fall by around 30% in the first five years after menopause, then more gradually.
Source: Brincat, 2000
What a routine can do
Support the barrier, hydration and how comfortable your skin feels day to day.
What it can’t
Change hormonal biology. That’s exactly why we measure — honestly.
Supported by the literature
- Humectants such as glycerin and hyaluronic acid hydrate the outer layers of skin.[5,6]
- Barrier lipids such as ceramides and squalane support barrier function and comfort.[7,8]
- Colloidal oat soothes the feeling of dry, irritated skin.[9]
- Daily broad-spectrum sunscreen has the strongest long-term evidence for how skin looks over the years.[10]
- Sleep quality is associated with how well the skin barrier recovers.[11]
Not supported — and never claimed
- That a cosmetic routine can reverse the hormonal changes of menopause.
- That any cream replaces medical care — questions about hormone therapy belong with your clinician.
- Headline percentages of “improvement” built on a handful of self-reports — which is why we never show them.
- Judging a product in a week. Skin renews over weeks, so we measure over ninety days.
Why a diary
A structured experiment of one.
Individual responses to skincare vary. Structured self-observation — one variable, repeated measures, logged confounders — borrows its logic from n-of-1 designs[12] without claiming to be a clinical trial.
Protocol Quality Score
How interpretable your diary is — shown to you as a label, recalculated nightly.
| Component | Weight | Computed as |
|---|---|---|
| Use adherence | 30% | Days used ÷ days elapsed, from weekly check-ins |
| Routine stability | 25% | 100 minus 20 for each product added, stopped, switched or procedure |
| Diary completion | 20% | Completed forms ÷ forms due |
| Baseline completeness | 15% | Required baseline answers given |
| Photo consistency | 10% | Standardised photo sets (redistributed if you decline photos) |
≥ 80
High-confidence diary
55–79
Moderately interpretable
< 55
Limited-confidence diary
References
Sources
- 1.Brincat MP. Hormone replacement therapy and the skin. Maturitas 35(2):107–117, 2000. Find on PubMed
- 2.Thornton MJ. Estrogens and aging skin. Dermato-Endocrinology 5(2):264–270, 2013. Find on PubMed
- 3.Hall G, Phillips TJ. Estrogen and skin: the effects of estrogen, menopause, and hormone replacement therapy on the skin. Journal of the American Academy of Dermatology 53(4):555–568, 2005. Find on PubMed
- 4.Ghadially R, Brown BE, Sequeira-Martin SM, Feingold KR, Elias PM. The aged epidermal permeability barrier. Journal of Clinical Investigation 95(5):2281–2290, 1995. Find on PubMed
- 5.Fluhr JW, Darlenski R, Surber C. Glycerol and the skin: holistic approach to its origin and functions. British Journal of Dermatology 159(1):23–34, 2008. Find on PubMed
- 6.Pavicic T, Gauglitz GG, Lersch P, et al.. Efficacy of cream-based novel formulations of hyaluronic acid of different molecular weights in anti-wrinkle treatment. Journal of Drugs in Dermatology 10(9):990–1000, 2011. Find on PubMed
- 7.Meckfessel MH, Brandt S. The structure, function, and importance of ceramides in skin and their use as therapeutic agents in skin-care products. Journal of the American Academy of Dermatology 71(1):177–184, 2014. Find on PubMed
- 8.Huang ZR, Lin YK, Fang JY. Biological and pharmacological activities of squalene and related compounds: potential uses in cosmetic dermatology. Molecules 14(1):540–554, 2009. Find on PubMed
- 9.Reynertson KA, Garay M, Nebus J, et al.. Anti-inflammatory activities of colloidal oatmeal (Avena sativa) contribute to the effectiveness of oats in treatment of itch associated with dry, irritated skin. Journal of Drugs in Dermatology 14(1):43–48, 2015. Find on PubMed
- 10.Hughes MCB, Williams GM, Baker P, Green AC. Sunscreen and prevention of skin aging: a randomized trial. Annals of Internal Medicine 158(11):781–790, 2013. Find on PubMed
- 11.Oyetakin-White P, Suggs A, Koo B, et al.. Does poor sleep quality affect skin ageing?. Clinical and Experimental Dermatology 40(1):17–22, 2015. Find on PubMed
- 12.Lillie EO, Patay B, Diamant J, et al.. The n-of-1 clinical trial: the ultimate strategy for individualizing medicine?. Personalized Medicine 8(2):161–173, 2011. Find on PubMed
This page summarises published literature for cosmetic education. It is not medical advice. Content is updated only through our claims review process.