Alnus Japonica Bark Extract

Alnus japonica bark extract is derived from the bark of the Japanese alder tree, a species with a long history in East Asian traditional medicine. The extract contains bioactive compounds called diarylheptanoids, including oregonin and hirsutanone, which are believed to be responsible for its therapeutic properties.

In skincare formulations, this ingredient is primarily used as a skin conditioning agent. Its traditional applications have centred on inflammatory and allergic skin conditions, which has prompted modern research into its potential mechanisms of action.

The bioactive compounds in Alnus japonica bark extract appear to work through multiple pathways. Research indicates that key compounds such as hirsutanone may inhibit specific signalling proteins involved in inflammatory responses, reducing the production of pro-inflammatory markers.

In animal models of atopic dermatitis, the extract demonstrated the ability to lower levels of inflammatory cytokines (IL-4, IL-5, and IL-13) and reduce expression of inflammation-related enzymes. However, the precise mechanisms in human skin and optimal concentrations for topical use require further investigation.

This ingredient is typically incorporated into serums, creams, or treatment formulations designed for reactive or inflamed skin. Follow the product instructions for frequency and application method. If you have sensitive or compromised skin, introduce products containing this extract gradually to monitor tolerance.