It helps accelerate alcohol metabolism in the liver.
Fact: Alcohol is consumed at a faster rate than our liver is able to process it. Our liver can process one standard drink in one hour. When we consume more than this, the additional alcohol (and its damaging toxin Acetaldehyde) will accumulate in the blood and body tissues (like the brain) until it can be metabolized. This toxin accumulation in our bodies is what causes the next-day headache, nausea, and fatigue that we feel after a night of drinking.
Purple Tree’s key ingredient is called Dihydromyricetin (DHM), an extract from the Japanese Raisin Tree, which has been used for centuries as an anti-alcohol herb and hangover cure in Asia. Dihydromyricetin has also demonstrated antioxidative, anti-inflammatory, anticancer, hepatoprotective, and anti-hypertension properties. 
So what makes it such a key ingredient for Purple Tree? In addition to its many health benefits, Dihydromyricetin is able to enhance the activity of the ADH enzyme , the main alcohol metabolizer. This means our liver can now break down alcohol faster , leading to less toxin build up in the blood and the brain. By accelerating alcohol breakdown and promoting liver health at the same time, Dihydromyricetin is a key ingredient to combat the next day effects of alcohol in our body.