Alpha Lipoic Acid
Alpha Lipoic Acid (ALA)
Alpha Lipoic Acid (ALA) is a naturally occurring organosulfur compound synthesized in small amounts by the body and found in foods like spinach, broccoli, and organ meats. It functions as both a fat- and water-soluble antioxidant and is used clinically for diabetic peripheral neuropathy, as well as by general health consumers for antioxidant support, blood sugar regulation, and metabolic health. The R-enantiomer (R-ALA) is the biologically active form, while most commercial products contain a racemic mixture of R- and S-ALA.
Mechanism of Action
ALA acts as a cofactor for mitochondrial enzyme complexes (pyruvate dehydrogenase and alpha-ketoglutarate dehydrogenase) and directly scavenges reactive oxygen species in both aqueous and lipid environments due to its unique dual solubility. It regenerates other antioxidants including glutathione, vitamins C and E, and CoQ10 by reducing their oxidized forms, effectively amplifying the body's overall antioxidant capacity. ALA also activates the AMPK pathway and inhibits NF-kB signaling, contributing to its insulin-sensitizing and anti-inflammatory effects, and it chelates redox-active metals such as iron and copper to reduce oxidative damage.
Evidence by Health Goal(17 goals)
Dosing Protocols
On empty stomach (30-60 minutes before meals)
For diabetic neuropathy, 600mg once daily is the best-supported clinical dose. General antioxidant use typically requires only 300mg/day. R-ALA is approximately twice as bioactive as racemic ALA, so doses of 150-300mg R-ALA are often considered equivalent. Taking with food reduces peak plasma levels but may reduce GI side effects. Avoid taking with dairy or high-fat meals as absorption may be impaired.
Safety & Side Effects
ALA has a well-established safety profile at doses up to 600mg/day in clinical trials lasting up to 4 years, and it is approved as a pharmaceutical drug for diabetic neuropathy in Germany. Caution is warranted in diabetic patients on glucose-lowering medications due to additive hypoglycemic effects, and individuals with thiamine deficiency or alcoholism should supplement B1 concurrently to avoid depletion.
Possible Side Effects
- !Nausea and gastrointestinal discomfort, particularly at doses above 600mg
- !Hypoglycemia, especially in diabetic patients taking insulin or oral hypoglycemics
- !Skin rash or allergic dermatitis (rare but reported)
- !Headache, particularly during initial supplementation
- !Thiamine (vitamin B1) depletion with very high or prolonged doses
- !Insomnia or restlessness if taken late in the day due to mild stimulatory effects
- !Metallic taste or sulfurous body odor at higher doses
Interactions
- -Potentiates insulin and oral hypoglycemic agents (sulfonylureas, metformin) - monitor blood glucose closely and adjust doses as needed
- -May enhance the effects of thyroid medications (levothyroxine) - separate dosing by at least 2-4 hours
- -Theoretically antagonizes cisplatin and other platinum-based chemotherapy agents - avoid concurrent use without oncologist guidance
- -May increase absorption and effects of other antioxidants (vitamins C, E, CoQ10) - generally beneficial but monitor for additive effects
- -Chelates minerals including iron and zinc - separate from mineral supplements by at least 2 hours to avoid reduced absorption of either compound
Cost & Where to Buy
Racemic ALA (300-600mg/day) is widely available and inexpensive at $10-20/month from bulk or store-brand suppliers. R-ALA stabilized formulations (sodium R-lipoate or potassium R-lipoate) cost significantly more, ranging $25-45/month, but offer greater bioavailability per milligram. Price varies considerably by form, brand reputation, and third-party testing quality.
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