You know how caffeine works in your drinks, but why is it showing up in skin care products? Caffeine has a few benefits worth noting. While
 

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it's not a "miracle ingredient", here are a few properties that make it good for the skin:

Antioxidant

Caffeine has antioxidant properties. While not the strongest antioxidant, it has the ability to neutralize free radicals. What does that mean?!? When skin cells get damaged, they lose an electron. That skin cell then looks to take an electron from a healthy cell to stabalize itself. Antioxidants help to neutralize those damaged cells to help prevent further damage. Put simply, antioxidants help promote healthy skin.

Helps regulate oil production

Products for oily skin may have caffeine on the ingredient list. Here's the 'scientific' reason: The 5-alpha reductase enzyme converts testosterone to DHT. This can often result in acne. It seems that caffeine helps to block this enzyme. While it's not the 'end-all-be-all' for breakout sufferers, caffeine is nice to have in addition to other valuable ingredients.

Anti-inflammatory

Studies show that caffeine may help calm down the skin. It's ability to restrict small blood vessels can help reduce puffy eyes. If you are in a bind, wet 2 caffeinated tea bags with warm water and place them over your eyes. The caffeine can temporarily help calm puffiness.

 

What's the press saying about Dermalogica products with caffeine?

 

RealSimple.com

Real Simple says that Concealing Spot Treatment is a breakout zapper that "...really blends in, so wear it under makeup during the day."

 Allure Magazine

Allure recommends Oil Control Lotion as a top pick for oily skin.
 Genlux Magazine

Genlux says Overnight Clearing Gel is a "nighttime must-have."