Alpha Lipoic Acid (ALA)
Alpha Lipoic Acid
TL;DR
Alpha-lipoic acid is an antioxidant made in the body and used at 300–600 mg/day, mainly for diabetic nerve pain and blood sugar support.
Ideal For
- Adults with diabetic peripheral neuropathy symptoms
- People with insulin resistance seeking adjunct support
- Those looking for a dual water- and fat-soluble antioxidant
Avoid If
- You have untreated thiamine deficiency
- You are on insulin or sulfonylureas without glucose monitoring
- You have thyroid disease managed with levothyroxine, without spacing doses
Frequently Asked Questions
Overview
Alpha-lipoic acid (ALA) is a sulphur-containing compound synthesised in mitochondria, where it acts as a cofactor for pyruvate dehydrogenase. Supplemental doses far exceed what the body makes, and at those levels ALA behaves mainly as an antioxidant that is soluble in both water and fat — unusual among micronutrients, and the reason it can act inside cell membranes as well as the cytosol.
The best-supported use is symptomatic diabetic peripheral neuropathy. Meta-analyses of intravenous and oral trials report modest reductions in burning, numbness and paraesthesia over 3–5 weeks, with oral 600 mg/day the most studied regimen. Evidence for glycaemic control is weaker: pooled trials suggest small reductions in fasting glucose and HbA1c, not enough to replace medication.
Claims about weight loss and general anti-ageing are thinner. Trials in overweight adults show average losses of roughly 1–2 kg over several months — statistically detectable, clinically small. Where evidence is strong, it is strong for nerve symptoms; elsewhere treat ALA as supportive rather than primary.
How It Works
- Cofactor for mitochondrial pyruvate and alpha-ketoglutarate dehydrogenase complexes
- Directly scavenges reactive oxygen species in both aqueous and lipid compartments
- Regenerates other antioxidants including vitamins C and E and glutathione
- Activates AMPK and improves insulin-stimulated glucose uptake in skeletal muscle
- Chelates transition metals that catalyse oxidative damage
Quick Facts
- Both water and fat-soluble antioxidant
- Supports healthy blood sugar metabolism
- May help with diabetic neuropathy
- Regenerates other antioxidants like vitamins C and E
- Supports mitochondrial function
Benefits & Outcomes
Nerve Pain Relief
The best-evidenced supplement for diabetic neuropathic symptoms.
Post-Meal Glucose Control
ALA has better evidence for diabetic neuropathy than for glucose control itself.
Carbohydrate Metabolism
Alpha-lipoic acid modestly improves insulin sensitivity, with its strongest evidence in diabetic neuropathy rather than glucose control itself.
Insulin Sensitivity
Alpha-lipoic acid improved insulin sensitivity in trials, with the strongest evidence in diabetic neuropathy populations.
Metabolism Boost
Alpha-lipoic acid supports mitochondrial glucose handling and insulin sensitivity, with the strongest metabolic evidence in insulin-resistant and diabetic populations.
Antioxidant Protection
ALA is an unusually versatile antioxidant - both water and fat soluble - and reliably lowers oxidative-stress markers in humans.
Blood Sugar Balance
ALA produces small but consistent improvements in fasting glucose and insulin sensitivity, most useful as an adjunct in insulin resistance.
Neuroprotection
ALA has the strongest neurological evidence of any antioxidant supplement, with reproducible symptom relief in diabetic peripheral neuropathy.
Glycation Prevention
Useful adjunct where glucose control and diabetic complications are the concern.
Cellular Health
ALA supports mitochondrial function and redox balance biochemically, but claims of broad cellular rejuvenation are unsupported in humans.
Health Concerns Addressed
Nerve Pain (Neuropathy)
Alpha-lipoic acid has the best supplement evidence for neuropathy — multiple trials in diabetic nerve damage show symptom and nerve-conduction improvement — though the strongest results came from intravenous dosing, and treating the underlying cause remains essential.
Burning Sensation
Reasonable adjunct for diabetic neuropathy symptoms; not a fix, and irrelevant for non-neuropathic burning.
Sciatica
Alpha-lipoic acid has genuine randomised trial evidence in diabetic nerve pain and early studies in nerve-root pain — plausible but preliminary for sciatica, where movement and time remain the proven therapies.
Numbness
Alpha-lipoic acid has reasonable evidence for the burning and paraesthesia of diabetic neuropathy, weaker evidence for numbness itself.
Peripheral Neuropathy
A defensible adjunct for symptomatic diabetic neuropathy at 600mg daily. It supports glucose control, it does not replace it.
Blood Sugar Dysregulation
Alpha-lipoic acid improves insulin sensitivity modestly and has its strongest evidence for diabetic neuropathy symptoms rather than glycaemic control itself.
Supporting Research23 studies
Effects of selected dietary supplements on migraine prophylaxis: A systematic review and dose-response meta-analysis of randomized controlled trials
Talandashti MK, Shahinfar H, Delgarm P +1 more
Magnesium supplementation reduced migraine attacks (mean difference (MD) = -2.51), severity (MD = -0.88), and the monthly migraine days (MD = -1.66) compared with the control group.
Efficacy and safety of antioxidant treatment with alpha-lipoic acid over 4 years in diabetic polyneuropathy: the NATHAN 1 trial
Ziegler D, Low PA, Litchy WJ +3 more
Efficacy and safety of antioxidant treatment with alpha-lipoic acid over 4 years in diabetic polyneuropathy.
Effects of Oral Alpha-Lipoic Acid Treatment on Diabetic Polyneuropathy: A Meta-Analysis and Systematic Review
ALA treatment had favorable effects on DSPN by reducing sensory symptoms.
Systematic review of treatments for diabetic peripheral neuropathy
Çakici N, Fakkel TM, van Neck JW +1 more
In the meta-analysis of trials of α-lipoic acid versus placebo, total symptom score was reduced by -2.45 (95% CI -4.52; -0.39) with 600 mg i.v. α-lipoic acid
Combined Rehabilitation with Alpha Lipoic Acid, Acetyl-L-Carnitine, Resveratrol, and Cholecalciferol in Discogenic Sciatica in Young People: A Randomized Clinical Trial
Scaturro D, Vitagliani F, Tomasello S +3 more
This prospective study aims to evaluate the effectiveness of a rehabilitation program combined with the administration of Alpha Lipoic Acid, Acetyl-L-Carnitine, Resveratrol, and Cholecalciferol in the treatment of sciatica due to herniated discs in young patients.
Alpha-lipoic acid supplementation and oxidative stress markers: a systematic review and meta-analysis
Akbari M, Ostadmohammadi V, Tabrizi R +3 more
Alpha-lipoic acid significantly reduced malondialdehyde and increased total antioxidant capacity
Lipoic Acid for Treatment of Progressive Multiple Sclerosis: A Phase 2 Randomized Clinical Trial
Spain R, et al
LA did not slow decline in walking speed or have other clinical effects different from placebo and was associated with newly described adverse events.
Efficacy and safety of oral alpha-lipoic acid supplementation for type 2 diabetes management: a systematic review and dose-response meta-analysis of randomized trials
Jibril AT, Jayedi A, Shab-Bidar S
Despite significant improvements, the effects of oral ALA supplementation on cardiometabolic risk factors in patients with T2D were not clinically important.
Alpha-lipoic acid for diabetic peripheral neuropathy: a meta-analysis of randomized controlled trials
Han T, Bai J, Liu W
Alpha-lipoic acid improved neuropathic symptom scores including burning pain.
Thioctic acid and acetyl-L-carnitine in the treatment of sciatic pain caused by a herniated disc: a randomized, double-blind, comparative study
Memeo A, Loiero M
Thioctic acid 600 mg/day appears to be at least as effective as ALC in the treatment of sciatic pain caused by a herniated disc and may be associated with an improvement in symptom scores and reduced need for analgesia. However, because of the limited number of patients evaluated and the lack of a placebo control in this trial, further studies are warranted in order to provide more definitive results.
Coenzyme Q10 + alpha lipoic acid for chronic COVID syndrome
Barletta MA, Marino G, Spagnolo B +1 more
A FSS complete response was reached in 62 (53.5%) patients in treatment group and in two (3.5%) patients in control group.
Comparison between Acupuncture and Nutraceutical Treatment with Migratens in Patients with Fibromyalgia Syndrome
Schweiger V
Migratens treatment shows a statistically significant reduction of pain 1 month after the start of therapy.
Clinical usefulness of oral supplementation with alpha-lipoic acid, curcumin phytosome, and B-group vitamins in patients with carpal tunnel syndrome undergoing surgical treatment
Pajardi G, Bortot P, Ponti V
Alpha-lipoic acid combined with curcumin and B vitamins improved recovery after carpal tunnel release.
Oral treatment with alpha-lipoic acid improves symptomatic diabetic polyneuropathy: the SYDNEY 2 trial
Ziegler D, Ametov A, Barinov A +3 more
Oral treatment with alpha-lipoic acid improves symptomatic diabetic polyneuropathy: the SYDNEY 2 trial.
Alpha Lipoic Acid with Pulsed Radiofrequency in Treatment of Chronic Lumbosacral Radicular Pain
Abdelrahman KA, Ibrahim AS, Osman AM +3 more
We try to evaluate the effect of using ALA as an adjuvant treatment in patients scheduled for pulsed radiofrequency.
Alpha-lipoic acid supplementation and leptin concentrations: a meta-analysis of randomized controlled trials
Namazi N, Larijani B, Azadbakht L
Alpha-lipoic acid significantly reduced circulating leptin alongside modest weight reduction
Alpha lipoic acid in burning mouth syndrome - a randomized double-blind placebo-controlled trial
Cavalcanti DR, da Silveira FR
Alpha-lipoic acid did not outperform placebo in burning mouth syndrome.
Disease-modifying therapies for diabetic peripheral neuropathy: A systematic review and meta-analysis of randomized controlled trials
Therapeutic outcomes were better in the experimental group than in the control group (odds ratio: 3.74; 95 % confidence interval: 2.57-5.45).
Alpha lipoic acid for symptomatic peripheral neuropathy in patients with diabetes: a meta-analysis of randomized controlled trials
Mijnhout GS, Kollen BJ, Alkhalaf A +2 more
Alpha lipoic acid for symptomatic peripheral neuropathy in patients with diabetes: a meta-analysis of randomized controlled trials.
Alpha-lipoic acid and insulin sensitivity: a meta-analysis of randomized controlled trials
Akbari M, Ostadmohammadi V, Tabrizi R +3 more
Alpha-lipoic acid significantly reduced fasting insulin and HOMA-IR
Treatment of symptomatic diabetic polyneuropathy with the antioxidant alpha-lipoic acid: a meta-analysis
Ziegler D, Nowak H, Kempler P +2 more
Treatment of symptomatic diabetic polyneuropathy with the antioxidant alpha-lipoic acid: a meta-analysis.
Alpha lipoic acid combined with epalrestat: a therapeutic option for patients with diabetic peripheral neuropathy
Wang X, Lin H, Xu S +1 more
Compared to epalrestat monotherapy, ALA 600 mg/d once a day (qd) combined with epalrestat 50 mg three times a day (tid) augmented the total effectiveness rate (14 days - risk ratio [RR]: 1.40, 95% CI: 1.16-1.69
A Comprehensive Review of Safety, Efficacy, and Indications for the Use of Alpha-Lipoic Acid and Acetyl-L-Carnitine in Neuropathic Pain
Aldendail CF, Chen P, Dibble HS +1 more
Meta-analysis of randomized controlled trials demonstrates that ALA can significantly improve neuropathic pain and nerve conduction velocity.
Safety Information
Potential Side Effects
Generally well tolerated. Nausea, heartburn and a rash are the most reported effects, usually at higher doses. Rare reports of insulin autoimmune syndrome, mainly in East Asian populations with a specific HLA genotype.
Contraindications
Caution with diabetes medication because of additive glucose lowering. People with thiamine deficiency, including heavy alcohol use, should correct thiamine first. Space at least 4 hours from levothyroxine.
Drug Interactions
- Insulin and sulfonylureas — additive hypoglycaemia risk
- Levothyroxine — may reduce absorption; separate doses
- Chemotherapy agents — theoretical antioxidant interference; discuss with oncology
Pregnancy & Breastfeeding
Pregnancy: insufficient_data
Breastfeeding: insufficient_data
Dosage Guidelines
Dosage Used in Studies
300-600 mg
Best Time to Take
Morning, before breakfast
Best Form
Racemic alpha-lipoic acid, because it is the form behind essentially all the neuropathy evidence
Bioavailability
Rapidly absorbed. R-form (R-ALA) more bioavailable than racemic mixture. Take away from food for better absorption. Both water and fat-soluble antioxidant.
Forms Compared
R-lipoic acid
Racemic ALA (R/S)
Sodium R-lipoate
Food & Timing
On an empty stomach — food reduces absorption substantially, so take 30 minutes before a meal
Medical Disclaimer
The information provided on this website is for educational and informational purposes only and is not intended as a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding a medical condition or before starting any supplement regimen.
Individual results may vary. The statements on this website have not been evaluated by the Food and Drug Administration. Products and information are not intended to diagnose, treat, cure, or prevent any disease.