The science
The evidence relevant to a hand cream is the evidence for moisturisers on frequently washed skin, and it favours exactly the sort of base this tube uses. A 2010 double-blind randomised study in the British Journal of Dermatology compared moisturisers in preventing dermatitis induced by repeated hand washing designed to simulate healthcare use and found that regular application of an emollient meaningfully reduced the barrier damage and irritation that washing produces, with the protective effect depending on consistent reapplication rather than on any exotic ingredient. That is the mechanism here: glycerin restores water to a stripped stratum corneum, shea butter's triterpene-rich fat and cetyl alcohol replace surface lipids and slow water loss, and dimethicone adds a thin, partly wash-resistant film that keeps the cream from feeling greasy while extending its protection.
The headline ingredients contribute little. There is no collagen in the formula, so the only collagen-related question is whether the plant extracts that stand in for it do anything; soybean extract contains isoflavones with some evidence for skin thickness and tone in oral and topical studies, but at this position in a hand cream it is a supporting botanical, and rice, carrot, quinoa, ginseng and sea grapes extracts are antioxidant and conditioning notes without hand-specific data. Acetyl hexapeptide-8 has a randomised, placebo-controlled facial study at ten percent for periorbital lines, where its proposed action is on muscle-driven creasing; the backs of the hands wrinkle through photoaging, dermal thinning and loss of subcutaneous fat, none of which the peptide can influence, so its inclusion is symbolic.
The tolerance profile is defined by the fragrance, which is the most common cosmetic allergen in patch-test series and is especially relevant on hands, where a compromised barrier from washing raises the odds of sensitisation and where hand eczema is common. The preservative system of phenoxyethanol with ethylhexylglycerin and caprylyl glycol is mild, and the absence of formaldehyde releasers is a point in the formula's favour for a product applied many times a day.
References 2 ShowHide
- A double-blind, randomized study to assess the effectiveness of different moisturizers in preventing dermatitis induced by hand washing to simulate healthcare use — British Journal of Dermatology (2010)
- The anti-wrinkle efficacy of argireline, a synthetic hexapeptide, in Chinese subjects: a randomized, placebo-controlled study — American Journal of Clinical Dermatology (2013)