Caffeine is a white, bitter-tasting alkaline crystal. Stimulant medicine that can be found in its seeds, leaves and fruits depending on the type of plant. New studies indicate that caffeine has significant effects on skin and hair health, and for this reason, many skin and hair care products today contain caffeine. Caffeine can affect the beauty and freshness of the skin in different ways, which we will discuss below.
Caffeine to get ride of dark circles around the eyes:
As you may know, a large part of the dark circles around the eyes is related to the genetic and hereditary issues of people, and therefore caffeine cannot completely remove the hereditary dark circles around the eyes, but its anti-inflammatory properties will be useful to reduce the puffy dark circles around the eyes. Also, caffeine inhence it by reducing the accumulation of blood in the vessels around the eyes (which is one of the main cause of dark circles under the eyes).
Caffeine is a way to reduce inflammation:
Caffeine in various products can take water from fat cells and this process causes to eliminate water from the surface of your skin and reduce skin swelling.
Caffeine to repair UV damage:
Interestingly, scientific research has shown that it may actually repair skin damage that caused by UV rays. Bear in mind that caffeine is a stronger antioxidant than green tea, and in fact, it can be among the best and most powerful antioxidants that fight with UV damage to skin cells. 
Hair strengthening:
If you are concerned about the health of your hair, you can also help strengthen your hair by including caffeine (in the allowed level) to your diet. You need to know that caffeine can give a natural shine to your hair in addition to strengthening the hair axis.