Prescription Lithium vs. Nutritional Lithium
August 25, 2026I posted on Instagram about lithium: how it was in 7UP in 1929, banned from sodas in 1948, and a year later became psychiatry’s gold-standard mood stabilizer. Somewhere in there we forgot it’s also a trace mineral in rock and drinking water.
Someone DM’ed me: okay, but what do you actually do with that? Fair. Here’s the version I’d say in the room.
What’s in the bottle
When people say “nutritional lithium,” they usually mean lithium orotate. A typical capsule carries about 5 mg of elemental lithium. Prescription lithium runs in the hundreds of milligrams, so a supplement dose is a few percent of that. The range that gets discussed clinically stretches from under 1 mg up to around 20 mg, still a small fraction of a prescription.
What it’s being studied for: neuroprotection, support for BDNF (the growth signal neurons use to adapt), and the population data where regions with more lithium in the water report lower dementia and suicide rates. Much of the mechanism work is in cell and animal models. There is no controlled trial of lithium supplements yet. So the honest status is: plausible, under-studied, and worth deciding carefully rather than reflexively.
How we decide
I don’t recommend it across the board, and I’d be wary of anyone who does. Here’s what has to be true first:
Kidney function is normal. Lithium leaves through the kidneys, so a comprehensive metabolic panel comes before any conversation about dose.
Thyroid is accounted for. Lithium can nudge thyroid function, so we want a full thyroid panel on the table.
Medications are reviewed. Certain diuretics, ACE inhibitors, and NSAIDs can raise lithium levels.
Not pregnant, not planning to be.
And we measure it. Serum lithium is on the blood panel we run with every patient, which means we know the starting point and can check it again… rather than guessing from a label.
If those boxes are checked and someone has mood reactivity, a family history that makes brain aging feel personal, or a preference for starting low and slow, then it becomes a real option to consider together. If they aren’t, it doesn’t.
Where it never belongs: as a treatment for bipolar disorder, or as a substitute for a medication that’s working.
That’s the take-home. Not “take lithium.” Not “avoid lithium.” Know your kidneys, your thyroid, your medication list, and your number… then decide with someone who has all four in front of them.
If you want that panel run and read in context, that’s what the Testing & Consultation program is built for.
Learn about Testing & Consultation
Hard on structures. Soft on people.
David A. Wiss, PhD, RDN, FMCP · fxmedmentalhealth.com