Lithium ascorbate and lithium carbonate are both lithium salts, but they are very different. Learn about their safety and efficiency.

Formula Differences

Lithium salts can be divided into organic and inorganic forms. Lithium carbonate is inorganic. It is easy and inexpensive to produce, so it is widely used in psychiatry. 

The body does not fully absorb lithium carbonate to other lithium forms. The more lithium carbonate is present in the body, the more lithium the kidneys must process and excrete through urine.

In summary, for lithium carbonate compared to organic salts:

• Absorption is slower.

• Higher doses are required.

• Excess lithium must be cleared through the kidneys.

Because of this, inorganic lithium salts may cause more side effects compared to organic lithium salts such as lithium ascorbate.

Dosage

Lithium carbonate is a prescription medication used under medical supervision, typically at daily doses ranging from 300 mg to 900 mg or higher depending on the condition being treated.

Lithium ascorbate supplements are generally used at much lower doses, such as 1 or 5 mg of lithium ascorbate per serving.

Animal studies suggest that lithium ascorbate may have a more favorable safety profile than lithium carbonate. In animal studies, researchers evaluated LD50 - the lethal dose for 50% of test animals. The higher the LD50, the lower the acute toxicity. For lithium ascorbate, LD50 was estimated as 6,334 mg/kg, and for lithium carbonate it was estimated as 531 mg/kg. 

Effects

To compare how effective lithium salts are in protecting neurons from stress, researchers conducted a cell study. 

In cell studies, glutamate is used to imitate excessive stress. Normally, glutamate is a neurotransmitter that helps the brain learn. However, an excess of glutamate can damage cells. Such excess occurs during stroke, traumatic brain injury, and epilepsy.

Researchers used mixtures of glutamate, lithium ascorbate, and lithium carbonate in different combinations to observe how neuron cells responded. Samples with lithium ascorbate showed higher neuron survival after glutamate exposure. Lithium carbonate showed higher toxicity and less protection in these experiments.

Because these lithium salts differ in formulation, dosage, intended use, and regulatory status, lithium ascorbate supplements should not be considered equivalent to prescription lithium carbonate. They are designed for different purposes and should not be substituted for one another. 

Author

Science Writer Vlada Sukhanovskaya

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Scientific Sources

• Torshin, I. Y., Gromova, O. A., Ostrenko, K. S., Filimonova, M. V., Gogoleva, I. V., Demidov, V. I., & Kalacheva, A. G. (2022). Lithium Ascorbate as a Promising Neuroprotector: Fundamental and Experimental Studies of an Organic Lithium Salt. Molecules (Basel, Switzerland), 27(7), 2253 https://www.mdpi.com/1420-3049/27/7/2253

• A complex study of the pharmacokinetics and compartmentalization of lithium ascorbate in 11 biosubstrates https://cdn.shopify.com/s/files/1/0632/4568/0810/files/Compartmentalization.pdf?v=1772616336

• Gromova O.A., Torshin I.Yu. Efficacy of Lithium Ascorbate in the Prevention and Treatment of Chronic Alcohol Intoxication https://cdn.shopify.com/s/files/1/0632/4568/0810/files/Alcohol_animals_full_text_ENG_2.pdf?v=1768384125

• Pepelyaev E.V., Semenov V.A., Gromova O.A., Torshin I.Yu., Volkov A.Yu. Effects of Lithium Ascorbate Intake in Middle‑Aged Patients with Stenotic Atherosclerosis of the Brachiocephalic Arteries https://cdn.shopify.com/s/files/1/0632/4568/0810/files/Chronic_cerebral_ischemia_full_text_ENG_2.pdf?v=1768390645

• Neuroprotective and Adaptogenic Effects of Lithium Ascorbate
  Gromova O.A., Torshin I.Yu., Pronin A.V., Stelmashuk E.V., Ostrenko K.S.,
  Sardaryan I.S., Aleksandrova O.P., Genrikhs E.E., Khaspekov L.G. https://cdn.shopify.com/s/files/1/0632/4568/0810/files/Stress_animals.pdf?v=1769597040
  

FAQs

1. What is the difference between lithium ascorbate and lithium carbonate?
Lithium ascorbate is an organic lithium salt commonly used in low-dose supplements, while lithium carbonate is an inorganic lithium salt used as a prescription medication. They differ in formulation, dosage, safety profile, and intended use.

2. Can lithium ascorbate replace lithium carbonate?
No. Lithium ascorbate supplements are not equivalent to prescription lithium carbonate and should not be used as a substitute for medical treatment prescribed by a healthcare professional.

3. How much lithium carbonate is typically prescribed?
Lithium carbonate is commonly prescribed at daily doses ranging from 300–900 mg or more, depending on the condition being treated and medical supervision.

4. How much lithium ascorbate is typically used?
Lithium ascorbate supplements are generally used at much lower amounts, often providing 1–5 mg per serving.

5. Which lithium salt showed lower toxicity in animal studies?
In animal studies, lithium ascorbate had an estimated LD50 of 6,334 mg/kg, while lithium carbonate had an estimated LD50 of 531 mg/kg. A higher LD50 generally indicates lower acute toxicity.

6. How did lithium ascorbate perform in neuron protection studies?
In laboratory cell studies designed to mimic stress-related neuronal damage, lithium ascorbate was associated with higher neuron survival after glutamate exposure compared with lithium carbonate.

Summary Of The Article

Lithium ascorbate and lithium carbonate are both lithium salts, but they differ in formulation, dosage, safety profile, and intended use. Lithium carbonate is a prescription medication used at much higher doses, while lithium ascorbate is a low-dose supplement that has shown lower toxicity and greater neuroprotective effects in certain laboratory and animal studies.