The science
The evidence for this cream lives in its base and not in its name. Glycerin and propylene glycol are established humectants that raise stratum corneum hydration, mineral oil is the reference occlusive that reduces transepidermal water loss, and lanolin oil, the liquid fraction of wool wax, is one of the most effective emollients for dry skin, all of which explains the comfortable, plumped feel dry-skinned users report. The prestige ingredients have thinner support. Caviar extract has a small laboratory literature: a 2020 International Journal of Molecular Sciences study found that caviar extract and its constituent DHA reduced markers of UVB-induced ageing in cell and mouse models by inducing adiponectin, and later work has explored photoaging and pigmentation pathways in similar models. Those studies used concentrated preparations under experimental conditions, and a trace at the fifteenth position of an ordinary emulsion cannot be assumed to deliver any of it. Hydrolysed elastin, DNA and RNA are large, water-binding fragments that form a surface film; they do not penetrate intact skin or contribute to its elastin or cells, and their effect is the temporary smoothing of any film-forming humectant.
The ester base has a specific record. The 1984 Journal of the American Academy of Dermatology rabbit-ear study that established the comedogenicity scale ranked isopropyl palmitate and myristyl myristate among the more comedogenic esters, and lanolin derivatives also scored; the model overstates the effect in human skin, but the placement of both esters in the top eight ingredients is the plausible basis for the breakouts combination-skinned reviewers describe. Mineral oil, by contrast, scored low and is among the least sensitising occlusives.
The tail carries the allergen risk. Lanolin's contact-allergy prevalence and its association with atopic dermatitis were tracked in a 2018 Contact Dermatitis analysis, and the fragrance's declared components, limonene, linalool and eugenol, appear among the recurring positives in the 2017 Contact Dermatitis multicentre patch-test study of the twenty-six labelled fragrance allergens. Diazolidinyl urea releases formaldehyde and is an established sensitiser; the parabens are well studied and safe at cosmetic levels. The absence of any UV filter means the cream offers no photoprotection, which for a product used in the morning on mature skin is the most consequential omission on the label.
References 4 ShowHide
- Caviar Extract and Its Constituent DHA Inhibits UVB-Irradiated Skin Aging by Inducing Adiponectin Production — International Journal of Molecular Sciences (2020)
- Comedogenicity of current therapeutic products, cosmetics, and ingredients in the rabbit ear — Journal of the American Academy of Dermatology (1984)
- Contact allergy to lanolin: temporal changes in prevalence and association with atopic dermatitis — Contact Dermatitis (2018)
- Non-mix fragrances are top sensitizers in consecutive dermatitis patients - a cross-sectional study of the 26 EU-labelled fragrance allergens — Contact Dermatitis (2017)