One of the scenes in the China-only version of "Iron Man 3"
One of the scenes in the China-only version of "Iron Man 3"

What does superhero Iron Man use to revitalize his energy?

The answer: Gu Li Duo, a milk drink sold in Chinese convenience stores for less than $1 a carton.

According to Hollywood Reporter, in the original comic series Iron Man may have gained his power through a mystical source, but in a special Chinese release of Iron Man 3, milk was touted as the source of Iron Man’s energy.

This pro-dairy adaption will only be available in the Chinese release. Read more.

This isn’t the first time Chinese milk has ended up on the big screen. Shuhua milk has appeared in Transformers: The Dark Side of the Moon and was featured on an episode of the CBS show, “The Big Bang Theory.” Click here for more.