Alpha-Lipoic Acid Side Effects, Interactions and Low Blood Sugar Cautions

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If you have repeated episodes of low blood sugar, or you take diabetes medicines and are thinking about alpha-lipoic acid, speak to a clinician or pharmacist first. Do not change any prescribed medicine on your own. In a medical emergency in the US call 911; for a possible overdose or poisoning US Poison Help is 1-800-222-1222 (see Poisoning: what to do first).

What the sources say overall

A 2020 review of 71 studies (4,749 participants), as summarized by NCCIH, found alpha-lipoic acid supplementation was safe in healthy individuals and in patients with certain diseases including cardiovascular disease, neurological disorders and diabetes. [1] "Safe" here describes the studies reviewed. It does not mean harmless for everyone, and rare events can be missed in trials.

Common side effects

Low blood sugar and insulin autoimmune syndrome

Insulin autoimmune syndrome (Hirata's disease) is a disorder caused by autoantibodies to insulin, shown by low blood sugar episodes. [4] A 2026 review states that medications and dietary supplements are considered the most frequent triggers, and that an increasing number of cases have been attributed to alpha-lipoic acid. [5] The review describes recurrent low blood sugar that may alternate with high blood sugar after meals, and reports a favorable outlook in most patients once clinicians withdraw the trigger and manage the condition. [5] A 2020 case report adds that in most cases it develops in predisposed people taking drugs containing sulfhydryl groups. [4]

This is described in the sources as rare. We did not find, in the sources we read, a rate of how often it occurs with supplements. If low blood sugar episodes are happening, a clinician needs to assess the cause; do not try to work it out alone.

Diabetes medicines and insulin

Proper evidence not found for a direct drug-by-drug interaction table for alpha-lipoic acid in the official sources we read (NCCIH). We searched PubMed for alpha-lipoic acid and hypoglycemia. NCCIH advises that dietary supplements may interact with medications or other supplements and that you should tell your health care providers about what you use. [1] Any adjustment to insulin or tablets is up to your prescriber, never something to guess.

Thyroid medicines and thyroid conditions

Proper evidence not found for a documented interaction between alpha-lipoic acid and thyroid medicine in humans. We searched PubMed for alpha-lipoic acid and thyroid function in humans and found only animal and cell studies. One review of insulin autoimmune syndrome calls methimazole (a thyroid medicine) the classical drug-associated cause, which shows why people on thyroid medicines should mention any new supplement to their clinician. [5] See thyroid and fatigue.

Pregnancy, breastfeeding and children

No official guidance was found in the sources we read. A 2014 narrative review proposed alpha-lipoic acid for nerve pain in pregnancy and called the data promising; a narrative review is not proof of safety. [6] A 2025 review noted a lack of studies in vulnerable populations. [7] Please ask a clinician. See pregnancy, breastfeeding and children.

Kidney or liver conditions, surgery and cancer treatment

Proper evidence not found on safety in kidney or liver disease. For surgery and for cancer treatment, tell your surgical or oncology team about the supplement; see antioxidant supplements before surgery, supplements before surgery and antioxidants and medicines.

Product quality

Labels vary in form and amount. See reading supplement labels, quality testing and certifications and medication interactions.