Ash tree bark extract is rich in esculin and fraxin known for their “vitamin P activity” and anti-oxidant properties, thus decreasing the permeability of blood vessels and reducing coloration under the eye. They are said to help protect the blood capillaries but also to fight against the degradation of haemoglobin into colored compounds, which is why it’s so popular in eye creams.
An ARC study evaluated several herbs and herbal combinations and found that one stood above the rest. Phytodolor, a branded combination of three herbs – aspen (Populus tremula), common ash bark (Franxinus excelsior), and golden rob herb (Solidago vigaurea) effectively manages the pain and inflammation associated with OA. Some studies have shown that aspen contains a substance that when ingested inhibits the production of certain prostaglandins in the nerves, resulting in pain relief. Common ash bark and golden rob herb also have pain-relieving properties, and common ash bark is an antioxidant – meaning it may reduce oxidative damage in the joint. The combination of the three herbs has been shown in animal studies to reduce inflammation. No major adverse effects have been reported, though some people do experience diarrhea, stomach upset, or skin reactions.
Not to be confused with pricky ash bark.
Skin Care and Cosmetic Ingredients Dictionary