The phrase "such as" is punctuated according to the rules of essential/nonessential.
...The sciences such as chemistry and physics are viewed to be...
...Cars such as Ford and GM are beyond...
..He enjoys Pepsi products, such as Mug root beer, more than...
Frankly, it is difficult for me to think of a good example where it does take a comma. It is most often essential and does not need punctuation.
Happy punctuating!
Margie