Antioxidant
Alpha-Lipoic Acid (ALA)
Also known as: ALA, Lipoic acid, Thioctic acid, Alpha-Lipoic Acid
Universal antioxidant working in both water and fat. Regenerates other antioxidants and supports blood sugar metabolism.
Last reviewed June 2026 · Evidence graded from peer-reviewed research, not editorial opinion. Educational only — not medical advice.
Every Alpha-Lipoic Acid (ALA) product we have scored
| # | Product | Score | Per serving |
|---|---|---|---|
| 1 | Pure Encapsulations Niacinamide | 90 A | $0.47 |
| 2 | Life Extension Mitochondrial Energy Optimizer with PQQ | 90 A | $1.63 |
| 3 | NOW Foods Alpha Lipoic Acid | 88 A | $0.20 |
| 4 | Thorne Alpha-Lipoic Acid | 87 A | $0.68 |
| 5 | Thorne L-Arginine Plus | 87 A | $1.25 |
| 6 | Pure Encapsulations PureCell | 87 A | $1.28 |
| 7 | Pure Encapsulations Alpha Lipoic Acid 400 mg | 87 A | $0.81 |
| 8 | Pure Encapsulations Alpha Lipoic Acid 200 mg | 87 A | $0.68 |
| 9 | Pure Encapsulations Alpha Lipoic Acid 600 mg | 87 A | $1.13 |
| 10 | Jarrow Formulas Alpha Lipoic Sustain | 87 A | $0.40 |
| 11 | Nutricost Alpha Lipoic Acid Capsules | 87 A | $0.23 |
| 12 | NOW Foods Extra Strength Alpha Lipoic Acid | 87 A | $0.29 |
Scored on dose accuracy, form, label transparency and third-party testing. Per-serving cost is list price divided by servings per container. No brand pays to be listed or ranked.
Common questions
How much Alpha-Lipoic Acid (ALA) should I take?
The typical range is 300-600 mg daily (150-300 R-ALA). Safe long-term
When should I take Alpha-Lipoic Acid (ALA)?
Empty stomach for blood sugar; any for antioxidant. Empty stomach better absorbed.
Which form of Alpha-Lipoic Acid (ALA) is best?
R-ALA — Natural, more potent. Other forms in the catalog: Racemic ALA, Na-R-ALA, R-lipoic acid, Alpha-lipoic acid.
Is Alpha-Lipoic Acid (ALA) safe?
Commonly reported: Hypoglycemia, Skin rash, GI upset. Serious warnings: Can lower blood sugar significantly. Safe
Which Alpha-Lipoic Acid (ALA) supplement scores highest?
Pure Encapsulations Niacinamide, at 90/100. Scored on dose accuracy, form, label transparency and third-party testing — no brand pays to be listed or ranked.
Primary uses
- Antioxidant
- Blood sugar support
- Neuropathy
- Heavy metal chelation
- Detoxification
- Blood sugar
- Nerve health
- Insulin sensitivity
What systematic reviews concluded
Outcomes that systematic reviews of Alpha-Lipoic Acid (ALA) reached a verdict on: 4 with a benefit, 4 with no effect, 1 with harm reported, 2 unclear. Each is quoted from a review and linked to it on PubMed. How these were read.
Reviews found a benefit (4)
“ALA treatment produced favorable results for TSS (a dose-related trend was observed), NDS, and the global satisfaction score.” PMID 37630823 · 2 reviews
“ALA supplementation may improve certain cardiometabolic risk factors by ameliorating anthropometric and glycemic parameters, as well as through its potential lipid-lowering effects.” PMID 41077538
“In this meta-analysis, ALA was associated with a favorable change in sperm quality.” PMID 40327515
“The use of certain dietary supplements has resulted in a significant decrease in migraine prophylaxis.” PMID 39404918
Reviews found no effect (4)
“For VAS, VPT, NIS-LL, and NCS results, ALA did not produce favorable results.” PMID 37630823
“ALA supplementation did not improve liver enzymes, lipid profiles, glycemic indices, adipocytokines, and obesity measures in patients with NAFLD.” PMID 41917882
“No significant associations were detected between ALA intake and intermediate disease markers, including TG, TC, HDL-C, LDL-C, HOMA-IR and FBS levels, in overweight or obese adults.” PMID 40180416
“ALA supplementation had no statistically significant effect on iron-related parameters.” PMID 40134249
Harm reported (1)
“Key sensitizers include vitamin derivatives (tocopherol, phytonadione, ascorbic acid), herbal extracts (Ginkgo biloba, turmeric, St. John's Wort), and antioxidants (α-lipoic acid, resveratrol).” PMID 41101984
Not enough to say: oxidative stress in coronary artery disease; hemoglobin levels.
3 findings from reviews in specific patient groups (such as cancer, pregnancy or surgery) are not shown here.
How it works
- Works in water and fat compartments
- Regenerates vitamins C and E
- Enhances insulin sensitivity
- Chelates heavy metals
Dosage
- Typical range
- 300-600 mg daily (150-300 R-ALA)
- Timing
- Empty stomach for blood sugar; any for antioxidant
- With food
- Empty stomach better absorbed
- Duration
- Safe long-term
- Special populations
- Diabetics, neuropathy
Forms
- R-ALA
- Racemic ALA
- Na-R-ALA
- R-lipoic acid
- Alpha-lipoic acid
Safety
Common side effects
- Hypoglycemia
- Skin rash
- GI upset
Contraindications
- Thiamine deficiency (deplete)
Products containing Alpha-Lipoic Acid (ALA)
Top-scoring supplements in our catalog that list Alpha-Lipoic Acid (ALA) on the label. Each product is graded on Formulate's ingredient-level rubric — dose accuracy, form, transparency, and third-party testing.
Evidence notes
Well-studied for neuropathy and blood sugar
Grade A: Multiple well-designed human trials support the main claims.
Cited research for Alpha-Lipoic Acid (ALA)
Clinical studies referenced across Formulate guides that mention alpha-lipoic acid (ala). Each links to the full study page with PubMed source + the guides that cite it.
- Ziegler D, Ametov A, Barinov A, et al. (2006)Diabetes Care
Efficacy of orally administered alpha-lipoic acid for symptomatic diabetic polyneuropathy: the SYDNEY 2 trial
- Ziegler D, Nowak H, Kempler P, et al. (2004)Diabetic Medicine
Treatment of symptomatic diabetic polyneuropathy with the antioxidant alpha-lipoic acid: a meta-analysis
Alpha-Lipoic Acid (ALA) compared head-to-head
Related in Antioxidant
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Medical disclaimer. This page is educational and does not replace advice from a qualified healthcare provider. Individual needs and risks vary — consult a professional before starting, stopping, or combining supplements, especially if you are pregnant or nursing, taking medication, or managing a health condition.