Alpha-Lipoic Acid
Also known as: ALA, Thioctic Acid, R-ALA, R-Lipoic Acid
A versatile antioxidant that works in both fat-soluble and water-soluble environments — and regenerates vitamins C and E.
What it is
Alpha-lipoic acid (ALA) is a sulfur-containing fatty acid that functions as a cofactor for mitochondrial enzymes and a potent antioxidant. Unlike most antioxidants that work in either water-soluble or fat-soluble environments, ALA is effective in both — giving it access to essentially all cellular compartments. It directly scavenges multiple reactive oxygen species and regenerates other antioxidants including vitamins C, E, coenzyme Q10, and glutathione.
How it works
ALA is rapidly absorbed and converted to its reduced form (dihydrolipoic acid or DHLA) in cells. DHLA regenerates oxidized glutathione to active GSH — effectively amplifying the body's antioxidant network. ALA also activates Nrf2 (master antioxidant gene regulator), improves insulin sensitivity through AMPK activation, chelates heavy metals, and reduces inflammation through NF-κB inhibition. Clinical evidence is strongest for diabetic peripheral neuropathy.
Clinical dose range
300–600 mg/day (standard ALA); 100–300 mg/day (R-ALA)
R-ALA is approximately 2–4× more potent than racemic (R+S) ALA — adjust dose accordingly. Take on an empty stomach for best absorption — food significantly reduces ALA bioavailability. Divide dosing (e.g., 200 mg twice daily) for sustained plasma levels.
Forms comparison
What to look for on the label
- Specifies R-ALA or racemic form on label
- Dose appropriate to form (lower for R-ALA)
- Third-party tested for purity and isomer specification
- Stability considerations: R-ALA is sensitive to heat — capsule storage in cool conditions important
Health goals supported
Safety & dosing notes
Generally safe. May lower blood glucose — caution in diabetes with active medications (hypoglycemia risk). Can deplete biotin — consider co-supplementation with biotin at therapeutic doses. Rare thiamine depletion at very high doses. Well tolerated at standard supplemental doses.
SuppsBuddy awards a form quality premium to R-ALA and Na-RALA over racemic forms. Products combining ALA with biotin receive a positive formulation flag. The empty stomach absorption requirement is highlighted in the dosing notes.
Frequently asked questions
What is Alpha-Lipoic Acid?
Alpha-lipoic acid (ALA) is a sulfur-containing fatty acid that functions as a cofactor for mitochondrial enzymes and a potent antioxidant. Unlike most antioxidants that work in either water-soluble or fat-soluble environments, ALA is effective in both — giving it access to essentially all cellular compartments. It directly scavenges multiple reactive oxygen species and regenerates other antioxidants including vitamins C, E, coenzyme Q10, and glutathione.
How does Alpha-Lipoic Acid work?
ALA is rapidly absorbed and converted to its reduced form (dihydrolipoic acid or DHLA) in cells. DHLA regenerates oxidized glutathione to active GSH — effectively amplifying the body's antioxidant network. ALA also activates Nrf2 (master antioxidant gene regulator), improves insulin sensitivity through AMPK activation, chelates heavy metals, and reduces inflammation through NF-κB inhibition. Clinical evidence is strongest for diabetic peripheral neuropathy.
What is the typical clinical dose range for Alpha-Lipoic Acid?
300–600 mg/day (standard ALA); 100–300 mg/day (R-ALA). R-ALA is approximately 2–4× more potent than racemic (R+S) ALA — adjust dose accordingly. Take on an empty stomach for best absorption — food significantly reduces ALA bioavailability. Divide dosing (e.g., 200 mg twice daily) for sustained plasma levels.
What forms of Alpha-Lipoic Acid should I look for?
R-ALA (R-alpha-lipoic acid, natural isomer): The biologically active isomer; more potent at lower doses; better for those who are sensitive to higher doses | Racemic ALA (R+S mixture): Standard commercial form; S-isomer may partially compete with R-isomer at receptor sites | Na-RALA (sodium R-ALA): Stabilized R-ALA with enhanced oral bioavailability; prevents thermal degradation
Is Alpha-Lipoic Acid safe?
Generally safe. May lower blood glucose — caution in diabetes with active medications (hypoglycemia risk). Can deplete biotin — consider co-supplementation with biotin at therapeutic doses. Rare thiamine depletion at very high doses. Well tolerated at standard supplemental doses. This information is educational and is not medical advice.
How does SuppsBuddy evaluate Alpha-Lipoic Acid?
SuppsBuddy awards a form quality premium to R-ALA and Na-RALA over racemic forms. Products combining ALA with biotin receive a positive formulation flag. The empty stomach absorption requirement is highlighted in the dosing notes.
Related ingredients
This page is for educational purposes only. These statements have not been evaluated by the FDA. This information is not intended to diagnose, treat, cure, or prevent any disease. Always consult a qualified healthcare professional before starting any supplement.