Lithium orotate in the UK: check your thyroid and kidneys first

1. Why is everyone suddenly asking about lithium orotate?

Because of mice. That is the short version.

Lithium is a metal. In small amounts it is present in food, water and the human brain. In much larger amounts it is a prescription medicine, usually as lithium carbonate. Lithium orotate is a different salt of the same metal, sold online as a food supplement. Products are usually labelled at 5 mg of elemental lithium per capsule.

The Harvard team measured metals in donated human brain tissue. Lithium was the only one that was lower in people who had died with mild cognitive impairment. In mice, cutting lithium from the diet sped up the changes seen in Alzheimer's disease. Giving those mice lithium orotate, at a tiny dose, reversed much of it.

The human part is an association in tissue. The treatment part is in animals. No person has taken lithium orotate in a trial and done better for it. The lead author, Bruce Yankner, said so himself to Alzforum.

“I do not recommend that people take lithium orotate at this point, because we have not yet determined the dose range or toxicity profile in humans, even though it looks promising in animal studies.”

One more number. Alzforum notes that prescription lithium raises blood levels around a thousand times above the body's own. The mouse dose sat far below that. A 5 mg capsule lands somewhere in between, and nobody has measured where.

2. What does lithium do to your thyroid and kidneys?

It can slow the first and it leaves through the second. Both are why the prescription version comes with a blood-test schedule.

The NHS page on lithium puts it plainly. “Taking lithium for a long time can also cause problems with your kidneys or thyroid gland”. It adds: “Your doctor will arrange blood tests to check for any changes in your thyroid and kidneys”.

The size of the thyroid effect is known. A 2012 review in The Lancet pooled 385 studies. People on lithium were almost six times as likely to develop an underactive thyroid as people who were not. The kidney picture was gentler: a measurable drop in how well the kidneys concentrate urine, but little sign of a meaningful fall in filtering power.

All of that evidence comes from prescription doses. A 5 mg capsule holds far less lithium than a 400 mg lithium carbonate tablet, which carries about 75 mg of the metal. Whether the smaller dose moves the thyroid at all has not been studied. Unstudied is not the same as safe.

Common signs of an underactive thyroid, in the NHS's words, are “tiredness, weight gain and feeling depressed”. Those are also the exact feelings people take a brain supplement to fix.

3. What should you check before you start?

The same things a doctor checks before prescribing the real thing.

NICE guideline CG185 tells clinicians what to do when starting lithium: “arrange tests for urea and electrolytes including calcium, estimated glomerular filtration rate (eGFR), thyroid function and a full blood count”. Then repeat the kidney and thyroid tests “every 6 months”.

• TSH. Thyroid stimulating hormone, the signal your brain sends to ask the thyroid for more. It rises when the thyroid is struggling, so it is the first number to move. Our TSH guide explains how it is read.
• Free T4 and free T3. The thyroid hormones themselves, the storage form and the active form. Together with TSH they show whether the gland is keeping up.
• Creatinine and eGFR. Creatinine is a waste product from muscle that healthy kidneys clear. eGFR is the filtering rate the lab works out from it. This pair is your kidney baseline, and our kidney function guide covers both.
• Urea. A second waste product the kidneys clear. It also rises when you are dehydrated, which matters with lithium.

Helvy's Thyroid & Vital Organs panel (£159) carries all six from a home finger-prick sample, with liver and cholesterol markers alongside. The thyroid hub has the rest of the thyroid reading.

Three things on the NICE list are not on any home panel we sell. A blood lithium level, calcium, and a full blood count are GP tests. If you already take prescription lithium, none of this replaces your monitoring.

A blood test measures biomarkers and offers wellness insight. It does not diagnose a condition. One reading outside its range does not on its own mean something is wrong, which is why a qualified clinician reads the whole set.

4. If you take it anyway, how would you know?

Borrow the prescription schedule. It exists because the effects are slow and silent.

• Get a baseline first. TSH, free T4, creatinine and eGFR now, before the first capsule, not in hindsight.
• Re-test at about three months. Sooner than the six-month prescription cadence, because nobody has mapped the supplement dose.
• Drink enough. NICE tells people on lithium to keep their fluids up after sweating, in hot weather or with a fever, because lithium builds up when you are dry.
• Watch the painkillers. NICE warns people on lithium not to take over-the-counter anti-inflammatory painkillers such as ibuprofen, which can push lithium levels up.

Some people should not experiment at all. Anyone already prescribed lithium, anyone pregnant or planning to be, and anyone with known kidney or thyroid disease should talk to their GP first. Lithium orotate is not a treatment for low mood, memory loss or any condition, and no supplement sold in the UK may claim to be.

If memory is the real question, our dementia blood test guide covers what can be measured today. Helvy does not sell lithium in any form.

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