Despite empirical and historical evidence, scientists are sometimes not happy until they have proven something in a lab. Well, now they have and we can all rejoice.

Swedish company AAK has confirmed the moisturising power of shea butter. Unlike active ingredients, emollients (substances that soften and soothe the skin) are not usually tested for efficacy.

Shea butter - shea nuts.

AAK’s researchers stimulated daily washing by treating the skin of volunteers with ethanol causing an increase in trans-epidermal water loss (TEWL).

The TEWL rapidly recovered after the application of Shea Butter and after two hours returned to basement levels. After three and four hours the barrier properties of the skin were improved on pre-treatment levels.

AAK also investigated the moisture levels deeper in the skin using a corneometer, finding consistent increase over four hours.

Original story:

Rural women have been gathering and processing shea butter in West Africa since at least the mid-fourteenth century. It is an edible fat, extracted from nuts of the shea tree. Shea butter is also a known anti-inflammatory agent and is very effective in the management of sinusitis and relief of nasal congestion.

MuLondon moisturisers are based on pure, certified organic shea butter that comes from a community project in Ghana.