Scientists in Germany have explained the wound healing and skin regeneration properties of tree bark which they have put down to one particular extract, betulin, and how it reacts on the skin.
The Birch Tree: an Elegant Force of Nature
Scientists develop technology that looks deeper at the skin repair system
Tissue Regeneration - an overview
Why Birch Helps Wounds Heal More Quickly
From a Traditional Medicinal Plant to a Rational Drug: Understanding the Clinically Proven Wound Healing Efficacy of Birch Bark Extract
Magnolia Bark: Benefits, Usage, and Side Effects
Protein - Cosmetics
The In-TREE-guing Science of Bark, Blog
Molecules, Free Full-Text
The Top 5 Benefits of Birch Bark Extract
Advances in spray products for skin regeneration - ScienceDirect
Advanced Science: Vol 11, No 3