What is alpha-lipoic acid?
Alpha-lipoic acid (ALA) is a natural compound that plays an important role in energy production within cell mitochondria. Unlike most antioxidants, ALA is unique — it dissolves in both fat and water, meaning it can function in virtually every tissue and cellular compartment in the body.
The body produces small amounts of alpha-lipoic acid on its own. Dietary sources include red meat, liver, spinach, broccoli, and yeast, but the amounts in these foods are modest. Supplements provide significantly higher doses, typically 200–600 mg.
How alpha-lipoic acid works
Alpha-lipoic acid participates in mitochondrial energy production, helping convert glucose into energy. It is also a potent antioxidant capable of neutralising free radicals in both cell membranes (fat environment) and inside cells (water environment). ALA may also help regenerate the active forms of other antioxidants, such as vitamins C and E.
Scientists have been particularly interested in ALA's effects on insulin sensitivity and glucose metabolism, as well as its potential neuroprotective action.
Evidence and benefits
Currently there are no EU-approved specific health claims for alpha-lipoic acid (EFSA). However, research suggests several potential benefits:
- Multiple clinical studies have shown that ALA may help support healthy blood sugar levels (Jacob et al., 1999)
- Research points to a possible positive effect on nerve health, particularly in the context of peripheral neuropathy (Ziegler et al., 2006)
- ALA's unique dual solubility provides antioxidant protection across a wide range of tissues (Packer et al., 1995)
- Some studies suggest a role for ALA in recycling other antioxidants (Shay et al., 2009)
Many studies have been conducted in patients with existing health conditions, so results may not directly apply to healthy individuals.
How to take alpha-lipoic acid
ALA supplements are available as capsules. R-alpha-lipoic acid (R-ALA) is the more biologically active form, while most supplements contain a mix of R- and S-forms. Dosages used in research range from 200–600 mg per day.
For better absorption, take ALA on an empty stomach, 30–60 minutes before a meal. Start with a lower dose and monitor blood sugar levels, especially if you take diabetes medication.
Who should consider it
- Individuals looking to support healthy blood sugar levels
- Those seeking broad-spectrum antioxidant support
- People concerned about nerve health
- Active individuals looking for energy metabolism support
- Those wanting to complement their antioxidant regimen
Consult a healthcare professional before starting any new supplement. This is especially important for people taking diabetes medications, as ALA may affect blood sugar levels.
Frequently asked questions
What is the difference between R-ALA and regular ALA? R-ALA is the natural, more biologically active form. Most supplements contain racemic ALA (a mix of R- and S-forms). R-ALA is more expensive but better absorbed.
Does ALA affect blood sugar levels? Yes, research suggests ALA may influence insulin sensitivity. Those taking diabetes medications should consult their doctor.
Can ALA be combined with other antioxidants? Yes, ALA complements vitamins C, E, and CoQ10 well. In fact, ALA may help regenerate these antioxidants.
Does ALA help with weight loss? Some studies suggest a modest effect on body weight management (Koh et al., 2011), but ALA is not a weight-loss supplement.
When is the best time to take ALA? On an empty stomach, 30–60 minutes before a meal. Food reduces absorption.
References
- Ziegler D, Ametov A, Barinov A, et al. (2006). Oral treatment with alpha-lipoic acid improves symptomatic diabetic polyneuropathy: the SYDNEY 2 trial. Diabetes Care, 29(11), 2365-2370.
- Jacob S, Ruus P, Hermann R, et al. (1999). Oral administration of RAC-alpha-lipoic acid modulates insulin sensitivity in patients with type-2 diabetes mellitus: a placebo-controlled pilot trial. Free Radical Biology and Medicine, 27(3-4), 309-314.
- Packer L, Witt EH, Tritschler HJ. (1995). Alpha-lipoic acid as a biological antioxidant. Free Radical Biology and Medicine, 19(2), 227-250.
- Koh EH, Lee WJ, Lee SA, et al. (2011). Effects of alpha-lipoic acid on body weight in obese subjects. American Journal of Medicine, 124(1), 85.e1-85.e8.
- Shay KP, Moreau RF, Smith EJ, et al. (2009). Alpha-lipoic acid as a dietary supplement: molecular mechanisms and therapeutic potential. Biochimica et Biophysica Acta, 1790(10), 1149-1160.
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Disclaimer
A food supplement is not a substitute for a varied and balanced diet and a healthy lifestyle.
