Alpha-Lipoic Acid
Alpha-lipoic acid is a sulfur-containing compound the body makes in small amounts and uses in enzymes that produce energy. Spinach, broccoli and organ meats contain a little.
Also listed as ALA, thioctic acid, Alpha Lipoid Acid
Does it help diabetic nerve symptoms?
A 2023 review of ten randomized trials found improvements in some symptom scores and patient satisfaction with oral alpha-lipoic acid, but not in several measures of sensation or nerve conduction. The analysis included doses of 600, 1,200 and 1,800 mg daily; these describe research treatments, not self-care doses. 1
What happens with longer treatment?
Cochrane’s 2024 review required treatment to last at least six months. Across three trials involving 816 adults, alpha-lipoic acid probably had little or no effect on neuropathy symptoms at six months. No included study reported quality of life or complications such as ulcers or amputations, so the evidence does not establish lasting nerve protection. 2
Does it lower blood sugar?
A 2021 meta-analysis of 28 studies found improvements in insulin resistance measures, but no overall change in glucose or HbA1c, a measure of longer-term blood sugar. This distinction matters: a favorable laboratory marker is not the same as improved blood sugar control. 3
Some insulin-related markers improved; the pooled glucose and HbA1c results did not. 3
What do the inflammation findings mean?
A review pooling 19 articles found lower CRP, IL-6 and TNF-alpha, markers used to study inflammation. Results varied extremely widely between studies. The review measured blood markers, so it cannot show that people experienced fewer illnesses or felt better. 4
Biomarker changes with very high study-to-study variation do not establish a reliable clinical benefit. 4
How much weight loss was seen?
A meta-analysis of ten trial reports found about 1.27 kg more short-term weight loss than placebo. The authors emphasized that the difference was small and that long-term benefits still needed study. 5
A small average short-term difference was observed; durable weight management was not established. 5
What about memory and healthy aging?
The hypothesis has a biological basis: a review describes antioxidant and anti-inflammatory effects in cells and animal models, with improvements in some rodent memory tasks. Other animal experiments found limited benefit. These models help explain why researchers are interested, while leaving the human question open. 6
The German consumer authority describes the Alzheimer evidence as small, short and partly based on animal research. It does not establish prevention or a favorable effect on disease progression. That evidence cannot support a broad promise to preserve memory. 7
What about fatty liver?
An eight-week randomized trial in 92 adults with obesity and fatty liver compared alpha-lipoic acid, myo-inositol, propolis and a control group alongside dietary weight-loss advice. It reported a signal for improvement in liver-fat grade with alpha-lipoic acid. Glucose measures did not differ significantly between groups, and the liver enzyme ALT fell in every group. 8
A small, short trial supports further study; it does not establish prevention of liver complications. 8
Effects by health goal
Open an effect to see the studies behind its rating. Bars show the size of the effect; the letter grades the evidence.
Weight Management1 effect
Longevity1 effect
Organ Function1 effect
Essential Health1 effect
Cognition2 effects
Other effects1 effect
All studies
17 publications are linked to Alpha-Lipoic Acid, newest first.