Alpha-lipoic acid is added to creatine complexes, pre-workout mixes and fat burners, promising faster recovery and better absorption of nutrients. The editors have checked what research confirms this, and what is based on data obtained in completely different groups of people.
Why athletes are interested in alpha-lipoic acid
Interest in alpha-lipoic acid in sports has three sources. The first is its role as an antioxidant: intense training increases the formation of reactive oxygen species, and it seemed logical to assume that an antioxidant would speed up recovery. The second is the effect on the assimilation of glucose by the muscles, which theoretically can improve the replenishment of glycogen and the supply of creatine.
The third source is data on the small effect of ALA on body weight in obese people, which made it a popular component of "fat-burning" complexes. As a result, ALA is often found in pre-workout mixes, creatine "transport systems" and weight loss products.
However, studies specifically on athletes are few. Most of the evidence for the effects of ALA has been obtained in patients with diabetes, insulin resistance, or obesity, and extrapolation to healthy, trained individuals should be done with caution.
Below, the editors consider each of the claimed effects separately and assess the strength of the evidence.
Oxidative stress and recovery
Several small studies have evaluated the effect of ALA on biochemical markers of oxidative stress in physically active individuals. In particular, Zembron-Lacny et al. (2009) compared ALA and N-acetylcysteine in physically active men and observed changes in indicators of antioxidant status and lipid peroxidation.
These results show that ALA is biologically active in the body of trained people. But changes in laboratory markers of oxidative stress do not yet mean improved results or faster recovery of muscle function. There is very little direct evidence that ALA reduces muscle soreness after exercise or speeds recovery.
How to interpret "lower oxidative stress" is also important. Evidence has accumulated over the past two decades that reactive oxygen species are not only harmful byproducts, but signaling molecules that trigger adaptations to exercise.
Therefore, the improvement of antioxidant markers cannot automatically be considered an advantage for the athlete, which is discussed in a separate section below.
Alpha-lipoic acid and creatine
One of the most cited sports studies of ALA is the work of Burke et al. (2003). Participants received creatine with sucrose, creatine with sucrose and ALA, or placebo. The authors found that in the group with ALA, the total content of creatine and phosphocreatine in muscles increased more than in the group without ALA.
This is consistent with the hypothesis that ALA enhances insulin-dependent uptake of nutrients by muscle. However, the study was small, and the effect on strength or muscle mass was not the primary outcome.
From a practical point of view, creatine by itself saturates the muscles in a few weeks with regular intake, and an additional "transport system" can only slightly accelerate this process. The editors are not aware of convincing evidence that ALA in creatine complexes gives a higher final increase in strength.
Therefore, products touting “revolutionary creatine absorption” thanks to ALA are based mostly on one small study rather than a solid evidence base.
Body composition and weight control
A randomized trial of ALA for weight loss was conducted by Koh et al (2011) in Korea in obese subjects. For 20 weeks, participants received 1,200 or 1,800 mg of ALA per day or a placebo. In the 1800 mg group, the reduction in body weight was statistically significantly greater than in the placebo group, but the absolute difference was modest.
For athletes with a normal body weight, these results are of limited significance: the effect is small, obtained at high doses and in obese people. In addition, with such doses, side reactions, in particular skin reactions, occurred more often.
| Declared effect | What research shows | Strength of evidence for athletes |
|---|---|---|
| Reduction of oxidative stress | Changes in biochemical markers | Low for real results |
| Creatine absorption | One small study with a positive result | Low |
| Decrease in body weight | Little effect in obese people | Low |
| Sensitivity to insulin | Positive data in type 2 diabetes | Indirect |
| Endurance, strength | No convincing data | Very low |
Diabetic neuropathy has been studied much more than athletic performance, but the clinical findings depend on the outcome and duration. Short-term studies such as SYDNEY 2 do not establish lasting benefit: a 2024 Cochrane review found that ALA probably has little or no effect on neuropathy symptoms after six months. These clinical populations also differ from healthy athletes.
So, as a pre-competition weight cutting agent, ALA has no advantages over basic approaches and is not a mandatory additive.
Can antioxidants interfere with adaptation
A study by Ristow et al. (2009) found that taking high doses of vitamins C and E during an exercise program inhibited some beneficial metabolic adaptations, including improved insulin sensitivity. Later work by other groups also reported that antioxidant supplementation could attenuate specific molecular responses to exercise.
Whether this applies to ALA is not known for sure: there are few similar studies with lipoic acid in particular, and the mechanisms of action of ALA differ from those of vitamins C and E. However, the very idea that "more antioxidants are always better" is considered outdated today.
Practical considerations of the editors for athletes:
- you should not take high doses of antioxidants constantly, in periods when the main goal is adaptation to loads;
- the main source of antioxidants should be vegetables, fruits and berries;
- the feasibility of ALA should be discussed with a doctor, especially in the presence of glucose metabolism disorders.
This approach avoids the situation where a supplement bought to accelerate progress actually slows it down.
Editorial conclusions
For athletes, the evidence base for alpha-lipoic acid is weak: there are data on changes in markers of oxidative stress, one small study on increased creatine absorption, and a modest effect on body weight in obese people.
There is no convincing evidence of improvement in strength, endurance, or recovery speed, and consistent intake of high doses of antioxidants could theoretically impair adaptation to training.
ALA has a larger research literature in diabetic neuropathy than in sport, but larger does not mean that lasting benefit has been established.
Related material: What is alpha lipoic acid and how does it work, ALA side effects, and our article on creatine and how to take it.
References
- Shay KP, Moreau RF, Smith EJ, Smith AR, Hagen TM. Alpha-lipoic acid as a dietary supplement: molecular mechanisms and therapeutic potential. Biochim Biophys Acta. 2009;1790(10):1149â1160.
- Burke DG, Chilibeck PD, Parise G, et al. Effect of alpha-lipoic acid combined with creatine monohydrate on human skeletal muscle creatine and phosphagen concentration. Int J Sport Nutr Exerc Metab. 2003;13(3):294â302.
- Zembron-Lacny A, Slowinska-Lisowska M, Szygula Z, et al. The comparison of antioxidant and hematological properties of N-acetylcysteine and alpha-lipoic acid in physically active males. Physiol Res. 2009;58(6):855â861.
- Koh EH, Lee WJ, Lee SA, et al. Effects of alpha-lipoic acid on body weight in obese subjects. Am J Med. 2011;124(1):85.e1â85.e8.
- Ristow M, Zarse K, Oberbach A, et al. Antioxidants prevent health-promoting effects of physical exercise in humans. Proc Natl Acad Sci USA. 2009;106(21):8665â8670.
- Ziegler D, Ametov A, Barinov A, et al. Oral treatment with alpha-lipoic acid improves symptomatic diabetic polyneuropathy: the SYDNEY 2 trial. Diabetes Care. 2006;29(11):2365â2370.
- Ziegler D, Low PA, Litchy WJ, et al. Efficacy and safety of antioxidant treatment with α-lipoic acid over 4 years in diabetic polyneuropathy: the NATHAN 1 trial. Diabetes Care. 2011;34(9):2054â2060.
