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Does alpha-lipoic acid help nerve pain and blood sugar?

Some trials suggest alpha-lipoic acid eases diabetic nerve pain, but the best recent review found little effect. Blood sugar results are mixed.

Published October 2026

Short answer

Mixed, limited evidence: some trials suggest it eases diabetic nerve pain and aids a small weight loss, but blood sugar results conflict. Evidence grade C (Limited). Meta-analyses of trials that disagree; downgraded for inconsistency and for high dropout risk in the largest review.

Key takeaways

  • The best recent review, a 2024 Cochrane analysis of three trials with 816 people, found little or no effect on nerve symptoms after six months [1].
  • Other meta-analyses of placebo-controlled trials found lower nerve symptom scores with alpha-lipoic acid, with a larger effect at higher doses [2][3].
  • Several meta-analyses found a small weight loss compared with placebo, roughly 0.7 to 2.3 kg [4][5][6].
  • Blood sugar results are mixed: some reviews found lower fasting glucose or HbA1c, while others found no change [7][8].
  • Side effects were mostly mild, such as stomach burning, nausea and itching [9][10].

The short version

Alpha-lipoic acid (ALA), a supplement also called thioctic acid, may ease burning and tingling in diabetic nerve pain, and several meta-analyses show a small weight loss [1][2][5]. The newest large review found little or no effect on nerve symptoms after six months, and blood sugar results conflict [1][8].

What the studies show

For nerve pain, the best-quality review is a 2024 Cochrane analysis of three placebo-controlled trials with 816 people. It found that ALA probably had little or no effect on symptom scores after six months [1]. Other pooled analyses found more benefit. A 2023 analysis of ten trials with 1,242 patients found ALA reduced sensory symptoms such as burning and numbness compared with placebo [2], and a 2022 analysis reported lower symptom scores than placebo [3]. A 2026 analysis of 15 studies found that most outcomes favoured ALA, but nerve conduction and HbA1c did not change [11].

For weight, several meta-analyses found ALA led to a small extra loss compared with placebo: about 1.3 kg in one analysis of ten trials [5], 0.7 kg in one of twelve trials [4], and 2.3 kg in one of eighteen studies [6]. A single 20-week trial of 360 obese adults found that 1,800 mg a day led to a 2.1% greater weight loss than placebo [10].

For blood sugar, the results conflict. A 2018 analysis of 24 trials in people with metabolic disease found lower fasting glucose and HbA1c [7]. A 2021 analysis of 28 trials found no change in glucose or HbA1c, although insulin and insulin resistance fell [8]. A 2019 review found lower fasting blood sugar and HbA1c, with no change in insulin resistance [12]. These are blood measures, not diabetes complications [8].

For fibromyalgia pain, ALA did not beat placebo in a small crossover trial in which 24 people finished both periods [13].

The nuances

The 2026 analysis found that the 600 mg a day dose was particularly effective for nerve symptoms [11]. Higher doses have also been tested: 1,800 mg a day for 12 weeks in a 236-person trial [9], and 600 mg twice a day for six months in a 200-person trial [14].

In a three-period trial of 55 people with neuropathic pain, pregabalin worked better than ALA, and adding ALA to pregabalin gave no extra benefit [15]. A 2026 open-label trial found pregabalin alone was not worse than the combination for diabetic nerve pain [16].

Most side effects were mild. In a 236-person trial, reported side effects were 25.4% with 1,800 mg a day versus 11.8% with placebo, mostly a burning feeling from the throat to the stomach [9]. In a 360-person trial, itching and hives were the most common side effects and were generally mild [10]. The authors of one review describe doses up to 1,200 mg a day as safe [4]. A review found no evidence of harm from ALA in people with G6PD deficiency [17]. None of the trials we reviewed tested pregnancy, breastfeeding or interactions with diabetes or other medicines, so those risks are unknown.

What this means for you

For diabetic nerve pain, the most rigorous recent review does not show a clear benefit [1], and pregabalin worked better than ALA in one trial [15]. For weight and blood sugar, the effects are small and mixed [4][8]. If you have diabetes, take diabetes medicines, or are pregnant, talk with your doctor before taking ALA. The alpha-lipoic acid topic page has the full safety section.

Go deeper

  • Alpha-Lipoic Acid — Alpha-lipoic acid may ease burning and tingling in diabetic nerve pain, and several meta-analyses show a small weight loss, but the strongest recent review fou…

References

  1. Alpha-lipoic acid for diabetic peripheral neuropathy.. Cochrane Database Syst Rev, 2024.
  2. Effects of Oral Alpha-Lipoic Acid Treatment on Diabetic Polyneuropathy: A Meta-Analysis and Systematic Review.. Nutrients, 2023.
  3. Evaluation of the analgesic effect of ɑ-lipoic acid in treating pain disorders: A systematic review and meta-analysis of randomized controlled trials.. Pharmacol Res, 2022.
  4. Alpha-lipoic acid supplement in obesity treatment: A systematic review and meta-analysis of clinical trials.. Clin Nutr, 2018.
  5. Alpha-lipoic acid (ALA) as a supplementation for weight loss: results from a meta-analysis of randomized controlled trials.. Obes Rev, 2017.
  6. Alpha-lipoic acid supplementation significantly reduces the risk of obesity in an updated systematic review and dose response meta-analysis of randomised placebo-controlled clinical trials.. Int J Clin Pract, 2020.
  7. The effects of alpha-lipoic acid supplementation on glucose control and lipid profiles among patients with metabolic diseases: A systematic review and meta-analysis of randomized controlled trials.. Metabolism, 2018.
  8. An updated systematic review and dose-response meta-analysis of the effects of α-lipoic acid supplementation on glycemic markers in adults.. Nutrition, 2021.
  9. [Efficacy and safety of high-dose α-lipoic acid in the treatment of diabetic polyneuropathy].. Zhonghua Yi Xue Za Zhi, 2010.
  10. Effects of alpha-lipoic Acid on body weight in obese subjects.. Am J Med, 2011.
  11. Effectiveness of alpha lipoic acid supplementation on biochemical, clinical, and inflammatory parameters in patients with diabetic polyneuropathy: A systematic review and meta-analysis.. Diabetes Metab Syndr, 2026.
  12. Alpha-lipoic acid (ALA) supplementation effect on glycemic and inflammatory biomarkers: A Systematic Review and meta- analysis.. Clin Nutr ESPEN, 2019.
  13. Double-blind, randomized, placebo-controlled crossover trial of alpha-lipoic acid for the treatment of fibromyalgia pain: the IMPALA trial.. Pain, 2021.
  14. Oral Alpha Lipoic Acid Treatment for Symptomatic Diabetic Peripheral Neuropathy: A Randomized Double-Blinded Placebo-Controlled Study.. Endocr Metab Immune Disord Drug Targets, 2020.
  15. Randomized, double-blind, controlled trial of a combination of alpha-lipoic acid and pregabalin for neuropathic pain: the PAIN-CARE trial.. Pain, 2024.
  16. Efficacy and Safety of Pregabalin and Alpha-Lipoic Acid Combination in Patients With Painful Diabetic Peripheral Neuropathy: A Randomized, Open-Label, Non-Inferiority, Phase IV Clinical Trial and Subgroup Analysis (OPTIMUM Study).. Diabetes Obes Metab, 2026.
  17. Adverse effects of herbal or dietary supplements in G6PD deficiency: a systematic review.. Br J Clin Pharmacol, 2017.