Alpha-Lipoic Acid (ALA): How It Works, Evidence & Safety
Last updated: June 2026 · Reviewed by the FactoWiki Editorial Team
Alpha-lipoic acid is an antioxidant studied mainly for nerve comfort and blood-sugar support. It appears in many nerve-health supplements such as Nervora.
What is Alpha-Lipoic Acid (ALA)?
Alpha-lipoic acid (ALA) is a naturally occurring compound that works as an antioxidant in both water- and fat-soluble parts of the body. The body makes small amounts, and it is also taken as a supplement, most often for nerve and metabolic support.
How Alpha-Lipoic Acid (ALA) works
ALA neutralises free radicals and helps regenerate other antioxidants such as vitamins C and E. It also supports healthy blood flow to nerves, which is why it is the most-studied nutritional agent for nerve symptoms.
What the evidence says
- A meta-analysis of randomised trials found alpha-lipoic acid improved nerve symptoms in people with diabetic neuropathy. (PubMed)
- A later systematic review reported ALA was generally effective and well tolerated for diabetic peripheral neuropathy. (PubMed)
How much do studies use?
Trials most commonly used about 600 mg per day. This is general information from research, not a recommendation; ALA is best taken away from a heavy meal for absorption.
Safety and side effects
Generally well tolerated; mild stomach upset is the most common effect. Most importantly, ALA can lower blood sugar.
Who should avoid Alpha-Lipoic Acid (ALA)?
Anyone with diabetes or taking blood-sugar or insulin medication should consult a doctor first, as combining them could push blood sugar too low. Pregnant or nursing women should also seek medical advice.
Frequently asked questions
What is alpha-lipoic acid used for?
It is used mainly as antioxidant support for nerve health and metabolic markers. It is nutritional support, not a treatment for any disease.
Can ALA lower blood sugar?
Research suggests it can have a blood-sugar-lowering effect, which is why people on diabetes medication should only use it under medical supervision.