Alpha-lipoic acid (ALA) is a sulfur-containing compound naturally produced in small amounts by the body, where it plays a key role in mitochondrial energy metabolism. Often grouped with amino acid-related compounds, ALA is distinctive because it functions as both a water- and fat-soluble antioxidant, allowing it to work across a wide range of tissues. Research suggests ALA may support healthy blood sugar metabolism by enhancing insulin sensitivity, and studies indicate potential benefits for nerve function, particularly in individuals experiencing peripheral neuropathy. Emerging evidence also points to roles in cognitive health, liver protection, and skin resilience against oxidative stress. ALA exists in two mirror-image forms — R-lipoic acid, which is the naturally occurring version, and S-lipoic acid — with most supplements offering a racemic blend of both.
Compare this supplementResearch suggests that alpha-lipoic acid (ALA) may offer modest support for weight management, with a 2017 meta-analy...
View studies →Research suggests that alpha-lipoic acid may have neuroprotective properties, though the human evidence remains limit...
View studies →Research suggests that alpha-lipoic acid may support nerve function, particularly in the context of diabetic peripher...
View studies →Research suggests that alpha-lipoic acid may offer hepatoprotective effects under conditions of chemically induced li...
View studies →Both improve insulin sensitivity and the blood-sugar-lowering effect may be additive.
View details →Both may improve insulin sensitivity and could produce additive blood-sugar-lowering effects.
View details →Both lower blood sugar and the effect is additive, which may cause hypoglycemia.
View details →Both support mitochondrial energy production and act as complementary antioxidants.
View details →These are commonly referenced dosage ranges for this supplement. They are not medical recommendations. Always consult a healthcare provider before supplementing.
| Form | Dose range | Frequency | Studied for | Source |
|---|---|---|---|---|
| Capsule | 300–600 mg | Daily | Antioxidant support and general health | Common in clinical trials for antioxidant effects |
| Capsule | 600–1,200 mg | Daily | Blood sugar regulation and insulin sensitivity in type 2 diabetes | Based on RCTs including Ziegler et al. and multiple diabetes studies |
| Capsule | 300–600 mg | Daily | Cognitive function and neuroprotection | Common in trials examining oxidative stress markers and cognitive outcomes |
| Capsule | 600–1,800 mg | Daily | Diabetic peripheral neuropathy and nerve function | Based on ALADIN and SYDNEY trials; doses often split across multiple administrations |
| Capsule | 1,200–1,800 mg | Daily | Weight management and metabolic support | Used in RCTs examining body weight and BMI reduction |
| Topical | 5 % | Daily | Skin health, anti-aging, and photoprotection | Based on clinical studies by Beitner et al. using 5% ALA cream formulations |