As it turns out, there *is* something to the idea of holding a tea bag to puffy eyes, too. The magic boils down to the caffeine. Caffeine is a vasoconstrictor, which in turns reduces redness, swelling, and extensive fluid from pooling around the eyes. This gives a tightened appearance around the eyes. Caffeine’s also been shown to neutralize groups of atoms called free radicals from DNA damage—plus, it has anti-inflammatory properties.