Pep was a brand of whole-wheat breakfast cereal produced by
the Kellogg Company, and introduced in 1923, which became
the first to be fortified with vitamins B and D in 1938. Pep was
a long-running rival to Wheaties, and also the sponsor of Mutual
Radio‘s The Adventures of Superman radio series. One of Pep’s advertising slogans was "the Sunshine cereal".
Pep ad featuring Our Gang (1928).