What are the risks and side effects of long-term lithium orotate use?

The evidence for lithium orotate's long-term safety is thin, and the one direct safety signal is concerning.

The 2021 review of lithium orotate reports a key finding from the 1970s: at high doses (2 mmol Li+/kg), lithium orotate showed potential for increased kidney toxicity compared to lithium carbonate [2]. That same review notes that this finding led to the curtailment of lithium orotate research [2]. No modern long-term safety study of lithium orotate appears in this retrieval.

The only other safety data point is a single case report: someone who took 18 tablets (about 69 mg of lithium ion) had only mild, transient symptoms [2]. That tells you nothing about chronic use at lower doses.

The 2022 microbiome study shows that lithium orotate affects gut bacteria differently than other lithium salts [1]. It moderately promotes commensal growth (AUC 0.5) and suppresses pathogens (mean MIC 7.27 µg/mL) [1]. Whether this shift is beneficial or harmful over years is unknown.

What is missing matters more than what is here. No record in this retrieval tracks kidney function, thyroid function, or cognitive side effects in people taking lithium orotate for months or years. No study compares long-term outcomes between lithium orotate and placebo. The entire safety profile is extrapolated from lithium carbonate data and from a handful of old animal studies.

My call: the long-term risks of lithium orotate are not established by this evidence. The kidney toxicity signal from high-dose animal work is real and has never been ruled out at lower human doses.

Confidence: low. The evidence base is too thin to call either safe or dangerous.