If you bought a bottle of the original 7-Up formulation, you did not receive a small dose of Lithium Citrate Unlike those used in lithium psychiatric care to stabilize the mood of patients with bipolar disorder, mania or depression. Originally described more transparently as "Bib-Label Lithiated Lemon-Lime Soda", the inclusion of lithium was seen as a solid selling point for the brand ̵
Did the inventor of 7 Up, Charles Leiper Grigg, aim to treat people? In fact, the inclusion of lithium in his drink is a side effect of where he has settled. Selected locations around the world have sources of naturally occurring lithium-rich water known as "Lithia Water." When he discovered the lithium in the St. Louis source of water he drew from, it was only natural that the public knew that his product contained the mood lightener and that "Lithiated" was added to the name of the lemonade.
Bonus Trivia: Although there is no official origin story for the name "7 Up," the current holding claims that it refers to the original seven major ingredients. One of the apocryphal stories is that the 7 in the name was an allusion to the atomic weight of lithium (rounded to an integer of 6.94).