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Lithium for Brain Health – History, Benefits, Supplementation, Side Effects & More

Lithium for Brain Health – History, Benefits, Supplementation, Side Effects & More
Photo of Lithium Salts
Lithium is simply a mineral salt, found naturally in many foods like grains, vegetables, meat and drinking water.

Mention lithium to most people and they’ll immediately think of the medication. Indeed, it’s well known in this context through many popular culture references over the years, both in music (“Lithium” by Nirvana springs to mind) and movies (think American Psycho). But beneath it all, lithium is simply the third element in the periodic table, found naturally as a mineral salt. Lithium is found in variable amounts in grains, vegetables, and drinking water, and in very small amounts in meat. But the concentration of lithium in food can vary widely depending on the quality of the soil crops are grown in and the filtration system used for drinking water, which has led to its manufacture as a supplement.

As a medication, lithium salts have been used for everything from gout to cancer since the early 1800s, but only gained momentum as a successful treatment for mental health conditions when Australian psychiatrist John Cade began using it to treat mania in 1949. Progress was slow, as overdoses resulted in catastrophic side effects, with some patients dying. However, several doctors continued to push forward with research, and in 1970 lithium was approved by the US Food and Drug Administration (FDA) for use in the treatment of manic illness. Since then it has become a popular treatment for many psychiatric disorders. Lithium is now listed in the WHO [World Health Organization] Model List of Essential Medicines, meaning it is classified as a basic medication that should be included in all health systems.

What are the clinical uses of lithium?

Lithium has myriad neuroprotective and neurotrophic (growth stimulating) effects within the brain, which can be useful in treating a range of psychiatric disorders. Its most common use is in the treatment of bipolar disorder, but it is also used for major depressive disorder that is refractory to antidepressants and sometimes for schizophrenia or other psychiatric conditions. Its use in bipolar disorder has been shown to reduce the risk of suicide, a benefit that has not been documented with other treatments.

More recently, experimental evidence has shown that lithium’s neurotrophic and neuroprotective effects may also be beneficial in the treatment of neurodegenerative conditions. Indeed, lithium has been shown to improve behavioural and cognitive deficits in stroke, fragile X syndrome, Alzheimer’s disease and Huntington’s patients, as well as in mouse models of Parkinson’s disease and multiple sclerosis. However, a study investigating the potential of lithium for the treatment of amyotrophic lateral sclerosis (ALS) found no significant benefits.

Evidence is mounting to suggest that lithium may have more wide-ranging neuroprotective effects than we ever realised. And that’s why more and more scientists are coming to believe that it may be beneficial not only for people with psychiatric disease, but for normal, healthy people as well.

What are the benefits for healthy people?

Photo of a Carefree Woman
Lithium’s calming and mood stabilizing effect was seen in a 1994 placebo-controlled study.

As early as the late 1800s, scientists had found traces of lithium in human organs and foetal tissues, leading some to suggest that it may have a specific function in the human body. But it wasn’t until the 1970s and 80s that studies began to document the importance of lithium to health. It was found that rats and goats fed low-lithium rations had higher mortality rates and also developed reproductive and behavioural abnormalities. In rats, lithium consistently decreases aggression. In humans, low lithium intake has been linked with increased hospital admissions for psychosis, neurosis and personality disorders, and, alarmingly, homicide rates.

In a 1994 placebo-controlled study, 24 former drug users were randomly selected to receive either 400 mg of lithium per day or a placebo, for four weeks. All subjects completed weekly self-administered mood test questionnaires. For those that received lithium, the total mood scores steadily increased over the four weeks, reflecting greater happiness, friendliness and energy, while those that received the placebo actually showed a slight decrease in their mood scores. This is compelling evidence for lithium’s calming and mood stabilizing effect.

In addition to all its cognitive effects, lithium has also been shown to have wider impacts on our health:

  • It reduces bone turnover and therefore improves bone density.
  • It helps entrain us to a longer circadian rhythm.
  • It has been shown to reduce insulin resistance and therefore diabetes risk in rats.
  • It improves the function of mitochondria, which are responsible for energy production in the cell, in worms.

But perhaps the strongest evidence for routinely including lithium in our diets came in 2011, when scientists documented significantly lower mortality rates in Japanese municipalities with more lithium in their drinking water. Taking the study a step further, the scientists then performed an experiment to examine the effects of comparable levels of lithium in roundworms. Sure enough, worms that received lithium lived significantly longer. Cause and effect remains to be proven, but the researchers believe that the improved longevity was attributable to lithium. While we’re busy working hard to eat well, exercise regularly and get plenty of sleep, it may be that we are missing out on one of the key aspects of improving our lifespan.

How does lithium work?

X-ray of Human Head
Lithium’s mechanisms combine and interact to exert neuroprotective and neurotrophic effects that would otherwise lead to cell death.

Lithium works by influencing the expression, production and action of a wide variety of enzymes, hormones, growth factors, neurotransmitters, receptors and other proteins in the brain and throughout the body. These mechanisms combine and interact to exert neuroprotective and neurotrophic effects.

Lithium:

  • Inhibits the production and activity of the enzyme glycogen synthase kinase-3 (GSK-3), which promotes apoptosis (cell death). This inhibition also in turn:
    • Induces production of brain-derived neurotrophic factor (BDNF), which is essential for cognitive development, synaptic plasticity, and neuronal survival.
    • Increases the expression of vascular endothelial growth factor (VEGF), which promotes cell proliferation, differentiation and migration of neuronal precursors, and neurovascular remodelling.
    • Induces production of HSP-70, one of a group of molecules called heat shock proteins that promote normal protein folding and refolding of misfolded proteins, inhibit formation of protein aggregates, and help degrade abnormally folded proteins. HSP-70 exerts a wide variety of neuroprotective effects against apoptosis.
    • Promotes conversion of neuronal progenitor cells into neurons in the hippocampus and the subventricular zone, the only two areas of the brain where this process occurs.
  • Inhibits the influx of calcium into neurons. In the brain, apoptosis pathways are promoted by signalling pathways that are activated when calcium enters the cell, so blocking this process improves cell survival. In particular, calcium influx mediates the activity of N-methyl-D-aspartate (NMDA) receptors, which contribute to glutamate-induced excitotoxicity in neurons.
  • Inhibits inositol monophosphatase (IMPase), which catalyses the production of inositol. When IMPase is inhibited, there is less free inositol in the cell and therefore reduced production of 1,4,5-trisphosphate (IP3). Lowered IP3 levels in turn promote autophagy, a process of degradation that eliminates defective proteins and cells and helps eliminate intracellular pathogens.
  • Induces B-cell lymphoma 2 (Bcl-2), an anti-apoptotic protein produced in the frontal cortex of the brain. Bcl-2 inhibits mitochondrial release of cytochrome C, which is an important messenger in apoptotic pathways, and helps protect the endoplasmic reticulum, which is responsible for protein synthesis in the cell. Bcl-2 also acts to increase N-acetyl aspartate (NAA) production, which is correlated with higher IQ scores and is thought to be an indicator of neuronal health.
  • Increases BDNF, nerve growth factor (NGF) and glial cell line-derived neurotrophic factor (GDNF) in the hippocampus, frontal cortex, occipital cortex and striatum of the brain. These are all neurotrophins, a class of molecules that supports neuron growth, survival and differentiation.

These mechanisms protect neurons from a range of processes that would otherwise lead to cell death. Lithium treatment also increases long-term potentiation (LTP) in the hippocampus, which promotes learning and memory, and increases serotonin release in the hippocampus, helping stabilise mood. A full treatment of the mechanisms of lithium’s neuroprotective and neurotrophic effects is beyond the scope of this article, but this gives you a window into the many benefits it offers for brain health.

How much do we need?

Photo of Pill Bottles
A report published in 2002 made a provisional recommendation of 1 mg per day based on an adult body weight of 70 kg.

Current dietary recommendations unfortunately do not yet include lithium. However, it is always the case that research moves much faster than public recommendations – take vitamin D for example; the reported RDI is 400 IU, yet if you ask a doctor they’ll tell you 4000 IU is closer to the mark – a whole order of magnitude higher! A report published in 2002 suggested that lithium ought to be considered an essential nutrient, and made a provisional recommendation of 1 mg per day based on an adult body weight of 70 kg.

Is long-term lithium supplementation safe?

Buy Lithium OrotateThe concept of lithium supplementation is still quite new, but the consumption of 1 mg per day is not. In 1985 the US Environmental Protection Agency (EPA) estimated the daily lithium intake of a 70 kg adult to range from 650 to 3100 µg. Average intake levels have dropped significantly since then as water has been filtered to within an inch of its life and top soil used for growing crops has become depleted of nutrients. However, in many countries, including parts of Spain and Japan, the fresh water and produce contain far greater amounts of lithium than what we get in other parts of the Western world, and daily consumption of lithium is often as high as 1 mg per day even without supplementation. Toxic effects have certainly been documented with excessive amounts of lithium, as occurred in the 1940s when lithium chloride was used as a salt substitute for cardiac patients. But the doses we are recommending here are not only safe – they’re beneficial.

Are there any potential side effects of lithium?

A myriad of side effects are possible with lithium when it is used as a medication:

  • Lithium can cause increased thirst and urination, dry mouth, hand tremors, confusion, impaired memory, headaches, and muscle weakness.
  • Lithium can also increase intestinal inflammation, which can cause nausea, vomiting and diarrhoea, though this is more likely to affect individuals who already suffer from an intestinal disorder.
  • Lithium alters blood electrolyte levels, reduces thyroid hormone levels, and increases cortisol production, though no clear clinical implications have been found for these effects.
  • Lithium use during pregnancy has been loosely associated with occasional birth defects, though a clear link has not been established.
  • Some medications can interact with lithium.

It’s important to understand that most side effects and interactions are dose dependent and none should be expected at the doses recommended for supplementation. For example, a typical dosage for bipolar disorder is 337 mg elemental lithium per day – that’s in contrast to 1 mg per day for supplementation! It’s worth noting also that most essential nutrients have a threshold of toxicity at some point – it’s all about finding the right dose. That said, if you have a medical condition or aren’t sure if lithium is right for you, you should consult with a medical professional.

The upshot

  • Key facts: Third element in the periodic table, found as mineral salts in nature, used commonly as a medication
  • Sources: Grains, vegetables, drinking water – though often in insufficient amounts
  • Clinical uses: Bipolar disorder, depression, schizophrenia, other psychiatric diseases
  • Key benefits: Mood stabilisation, improved longevity, reduced risk of psychiatric disease, improved brain health
  • Mechanism: Inhibition of apoptosis (cell death), induction of neurotrophic (growth) factors, promotion of autophagy (removal of defective proteins), promotion of cell proliferation
  • Dosage: 1 mg per day, taken orally
  • Safety margin: High
  • Side effects: None expected at supplementation dosages

Filed Under: Lithium, Nootropics

Comments

  1. Soloman says

    June 2, 2017 at 6:57 pm

    Our favorite Lithium Supplement is the 1mg Lithium Orotate from Essenta

    Reply

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