I just came across this article in the New York Times, where lithium (or more correctly, lithium salts), a known anti-depressant had been added to beverages in the 1940's. They also mention that a study found negative correlation between the suicide rate of a county and the amount of lithium in its tap water, despite the fact that the concentration is relatively low ($\pu{<0.170 mg L^-1}$), especially compared to the doses administered in therapy.

Now I was wondering what the lithium content in those beverages was (obviously, they are not sold anymore), but couldn't find anything?

The article mentions that you can still buy lithia water ($\pu{0.50 mg L^-1}$), but I'm more interested in the 1940's 7-Up mentioned, as those probably had different food standards at the time they were made.

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    $\begingroup$ Related: Do higher rates of lithium in groundwater lead to a decreased suicide rate? $\endgroup$ – Loong Mar 22 '16 at 14:37
  • $\begingroup$ Have you considered contacting 7-up (owned by Dr Pepper in the US and Pepsi everywhere else) and asking them? There's a chance they might give some sort of answer if you say it's for a school project or something like that. As far as I have seen, the general internet only seems to know that there was lithium citrate in the drink rather than how much was in it. $\endgroup$ – Tyberius Apr 15 '17 at 14:38

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