@skepteis when did they stop adding lithium?
https://en.m.wikipedia.org/wiki/7_Up
7 Up has been reformulated several times since its launch in 1929. In 2006, the version of the product sold in the U.S. was reformulated so it could be marketed as being "100% natural"
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In 2007, after the Center for Science in the Public Interest threatened to sue 7 Up, it was announced that 7 Up would stop being marketed as "100% natural". Instead, it is now promoted as having "100% Natural Flavors".
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In 2011, 7 Up began test marketing a formula, called 7 Up Retro, using sugar rather than HFCS. Container labels sport the caption, "Made With Real Sugar".
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https://www.cnet.com/culture/mix-7up-with-lithium-and-heres-what-happens/
It actually used lithium citrate, a mood-stabilizing drug, in its formula until 1948, when the US Food and Drug Administration outlawed usage of the chemical in soda drinks, according to the myth-busting blog Snopes.
