7UP was sold as a health drink.

It depends entirely which lithium is meant. Prescription lithium is a pharmacologic dose, commonly 600 to 1200 mg daily, monitored with blood tests because the margin between a working level and a harmful one is narrow, with established kidney and thyroid considerations. What occurs naturally in groundwater is a trace amount, orders of magnitude lower. Absence of a study at the low amount is not a safety finding in either direction. Anyone on a prescribed medication, pregnant or nursing, or with a kidney or thyroid condition should speak with their own clinician.

It is the same element at a very different amount. Orotate is the carrier it is bound to, the way magnesium can be bound to glycinate or citrate. What matters is how much elemental lithium is present, and in a nutritional product that sits far below a prescribed dose.

There is no human head-to-head pharmacokinetic trial comparing the two at equal elemental doses. Claims of dramatically superior absorption are running ahead of the published evidence.

Yes. The drink launched in 1929 as Bib-Label Lithiated Lemon-Lime Soda and lithium remained in the formula until 1948, when it was removed from American sodas. Lithia spring water was a popular destination before that.

It came out of American soft drinks in 1948. No published finding demonstrated harm at the amounts involved. The association most people now have with the word comes from psychiatric medicine, which uses a vastly higher dose.

Yes. It leaches naturally from rock into groundwater, so the amount varies widely with local geology. Neighbouring areas can differ by a factor of a hundred, and modern treatment removes a portion of what is present.

Studies from Texas, Japan, Austria, England, Denmark and others have compared regions with differing concentrations since 1990, and a 2022 analysis reported a dose-response relationship. These are ecological studies: they compare populations rather than individuals, so they can describe a pattern but cannot establish cause for any one person. Not every study agrees, and the null results are included in the citation list.

The large majority of the mood literature studies prescription lithium at 600 to 1200 mg daily with serum monitoring, and at that dose the evidence is deep: it remains the only mood stabiliser with a replicated reduction in suicide. Whether any of that transfers down to a trace amount is a separate question nobody has answered. The gap is roughly a thousandfold, so treating a finding from one as a finding about the other is the single largest extrapolation made on this subject.

This is an active research question, not an established use. A Danish national cohort examined long-term exposure through drinking water, a 2024 systematic review assessed the trace lithium and dementia literature, and smaller studies have looked at microdose lithium in cognitive decline. In 2025 a laboratory group reported that brain lithium is lower where Alzheimer's is present and that amyloid appears to sequester it, which is animal work.

There is an observational signal and a plausible mechanism. Case-control data and a meta-analysis of observational studies both reported lower fracture risk among people taking prescribed lithium, and laboratory work points to Wnt signalling, the pathway bone-building cells use. Those are different populations and different doses from a trace amount.

Lithium inhibits GSK-3, which activates Wnt signalling. Wnt is the pathway osteoblasts use to build bone and is also implicated in the tau phosphorylation behind neurofibrillary tangles. One mechanism therefore predicts effects in two systems that look unrelated from the outside, which is why findings in both keep appearing together.

There is a mechanistic literature covering autophagy, microglial activation, interferon-gamma signalling and T-cell subpopulations. Most of it is laboratory and animal work, which explains how something could happen rather than establishing that it does happen in people.

It is an element. Whether it is also a nutrient is unsettled: there is no established recommended intake, and published reviews have argued the case for treating it as an essential trace element without the question being concluded.

Not formally. No recommended intake exists. Reviews have traced dietary intakes across populations and argued for essentiality, and that argument remains open rather than settled.

Intake varies enormously with water supply and food source, and the ranges have been mapped in the dietary literature. Because the amount depends on local geology, there is no single figure that applies everywhere.

We addressed that separately, with the evidence, in a dedicated post linked in the related reading below.

Pregnancy is listed as a caution, not a suggestion, and nothing on this page should be read as a recommendation to supplement during pregnancy. That is a conversation for an obstetric clinician who knows the individual case.

A widely shared paper claiming exactly that, based on UK Biobank data, has been retracted. It still circulates. Any source still citing it has not been maintained.