Rubidium
Rb — Element #37
also known as Rubidium chloride, Rubidium carbonate
Rubidium is an alkali metal chemically similar to potassium and is ubiquitously present in mammalian tissues, with humans typically carrying 360–1,000 mg total body rubidium. Despite its consistent presence in biological systems, no specific essential metabolic function has been identified in humans. Some evidence suggests rubidium may partially substitute for potassium in certain cellular processes. It is classified as an emerging/possibly essential element with insufficient evidence for a dietary requirement.
- Rubidium is present in all body tissues and follows potassium distribution, suggesting it may substitute for potassium in some cellular transport processes
- Preliminary in vitro and animal data suggest rubidium may have mild anxiolytic or antidepressant activity, possibly through interaction with serotonergic systems
- Some research suggests rubidium uptake is altered in cancer tissue compared to normal tissue, making it a potential diagnostic or investigational marker
- No confirmed beneficial biological role or therapeutic benefit in humans has been established
Active in Rb⁺ ion.
No established RDA or UL; evidence for essentiality or supplemental benefit is absent
Rubidium chloride administered at high doses in animal studies displaces potassium and causes hypokalemia-like effects
Has been investigated historically as a psychiatric treatment (antidepressant) in very limited and methodologically weak trials — not clinically established
Rubidium is not approved or regulated as a supplement or drug; safety data in humans from intentional supplementation is extremely limited
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