Best Alpha-Lipoic Acid 2026: Ranked by Cost per Active R-ALA
The best alpha-lipoic acid for most people is BulkSupplements Alpha Lipoic Acid: 600 mg a day for $0.22 at its own price. It is the one our readers buy most. People mostly take ALA for nerve pain from diabetes, where trial results are mixed. For a tested one, buy Thorne Alpha-Lipoic Acid.
By Erin Rose Updated October 19, 2026 How we score
Our pick for: Most people
BulkSupplements Alpha Lipoic Acid
8.5/10 Our score
Top score of the 8 we link, tied with Nutricost, and a cent cheaper a day
- Per day
- 600 mg2 capsules of 300 mg
- Cost
- $0.22 a dayBrand price; Amazon’s can differ
- Bottle
- 120 days240 capsules
- Testing
- Brand says testedNot on a public testing list
Why we pick it It is the alpha-lipoic acid our readers buy most, and it costs the least for 600 mg a day. It is one ingredient, with no blend.
What you give up A serving is two capsules, not one. BulkSupplements says it is third-party tested but names no lab, and it is not on a public testing list. Want one that is? See the tested pick below.
Which alpha-lipoic acid is right for you?
Trials gave 600 to 1,800 mg a day. Here are the other good choices.
Want one on a testing list?
Thorne Alpha-Lipoic Acid is on NSF/ANSI 173, which checks that the capsule holds what the label says. It is the only one we link on a public testing list. Each capsule has 300 mg, so 600 mg is two capsules, at $1.37 a day at Thorne’s price.
Thorne Alpha-Lipoic Acid
6.5/10 · $1.37 a day · NSF/ANSI 173
Want one capsule a day?
NOW Alpha Lipoic Acid has 600 mg in one capsule, for $0.27 a day at iHerb’s price (NOW’s own store price could not be read). It also adds 30 mg of grape seed extract and 4 mg of black pepper extract.
NOW Alpha Lipoic Acid 600 mg
7.0/10 · $0.27 a day
Want R-ALA instead?
Regular ALA is half R and half S. R-ALA is the R form alone. Nutricost has 100 mg of R-ALA in one capsule; three capsules match the R in 600 mg of regular ALA, for $0.62 a day. We found no trial showing R-ALA works better per milligram.
Nutricost R-Alpha Lipoic Acid
7.0/10 · $0.62 per 300 mg of R
Taking it for diabetic nerve pain?
A 2024 Cochrane review found ALA by mouth probably has little or no effect on nerve symptoms after six months (Baicus 2024). Talk to your doctor, and see what the research found.
Alpha-lipoic acid supplements we compared
Scored on dose, testing, cost, label and recalls. Our pick comes first, then by score. Costs are for 600 mg of regular ALA a day (300 mg of R-ALA for the R products) at each brand’s own price (NOW: iHerb’s), checked October 19, 2026.
| Alpha-lipoic acid | Per day | Why it is or is not a pick |
|---|---|---|
| BulkSupplements Alpha Lipoic Acid8.5/10 | $0.22 | Our pick: 600 mg in 2 capsules; the lowest cost |
| Nutricost Alpha Lipoic Acid8.5/10 | $0.23 | Same score; 600 mg in 2 capsules, a cent more a day |
| Horbaach Alpha Lipoic Acid7.0/10 | $0.25 | 600 mg in 3 capsules, plus 999 mcg biotin; says lab tested, names no lab |
| NOW Alpha Lipoic Acid 600 mg7.0/10 | $0.27 | 600 mg in 1 capsule, plus grape seed and black pepper extract |
| Nutricost R-Alpha Lipoic Acid7.0/10 | $0.62 | Our R-ALA pick: 100 mg of R a capsule; 3 match 600 mg of regular |
| Thorne Alpha-Lipoic Acid6.5/10 | $1.37 | Our tested pick: on NSF/ANSI 173; its label serving is one 300 mg capsule, so fewer dose points; costs the most |
| Doctor’s Best Alpha-Lipoic Acid6.0/10 | $0.28 | 600 mg in 1 capsule, nothing added; a cent more than NOW |
| Life Extension Super R-Lipoic Acid5.5/10 | $0.75 | 240 mg of R a capsule; costs more per mg of R |
How to read an alpha-lipoic acid label
Check the milligrams per capsule, not just the big number on the front. Some “600 mg” bottles mean two or three capsules. A label that says only “alpha-lipoic acid” is regular ALA, half R and half S. “R-ALA” or “R-lipoic acid” is the R form alone.
Does alpha-lipoic acid work?
The reviews we cite looked at nerve pain in people with diabetes, at 600 to 1,800 mg a day. A 2023 review of 10 trials found some symptom scores improved (Hsieh 2023). The 2024 Cochrane review found it probably has little or no effect on symptoms after six months, and judged all its studies at high risk of bias from missing participants (Baicus 2024). More in our alpha-lipoic acid guide.
Questions people ask
Is R-ALA better than regular ALA?
We found no trial showing it. Regular ALA is a 50/50 mix of two mirror-image forms, R and S, so 600 mg holds 300 mg of R. A small study found a stabilized R form reached higher blood levels (Carlson 2007), but that measured blood levels, not results in people.
How much should I take?
Nerve trials gave 600 to 1,800 mg a day (Hsieh 2023). Start with 600 mg. That is two capsules of our pick. See how much alpha-lipoic acid to take.
Who should be careful with it?
People with diabetes, since ALA may lower blood sugar (Akbari 2018). Rarely, it can trigger an immune reaction that causes low blood sugar. Europe’s food safety agency reviewed 49 cases: the risk is likely in people with certain genes, which no simple test finds, and every case cleared after stopping ALA (EFSA 2021). Pregnant or on medicine? Ask your doctor first.
How we score
Five marks: does a serving hold 600 mg; is the product on a public testing list; what a day costs at the brand’s own price against the cheapest like it; does the label state the amount; and the brand’s FDA recall record. Dose and testing are worth up to 3 points each, cost up to 2, label and recalls up to 1 each. R-ALA products are priced against each other, per 300 mg of R. More on our method.
Sources
- Baicus C, et al. “Alpha-lipoic acid for diabetic peripheral neuropathy.” Cochrane Database Syst Rev. 2024. PubMed 38205823
- Hsieh RY, et al. “Effects of Oral Alpha-Lipoic Acid Treatment on Diabetic Polyneuropathy: A Meta-Analysis and Systematic Review.” Nutrients. 2023. PubMed 37630823
- Carlson DA, et al. “The plasma pharmacokinetics of R-(+)-lipoic acid administered as sodium R-(+)-lipoate to healthy human subjects.” Altern Med Rev. 2007. PubMed 18069903
- Akbari M, et al. “The effects of alpha-lipoic acid supplementation on glucose control and lipid profiles among patients with metabolic diseases: A systematic review and meta-analysis of randomized controlled trials.” Metabolism. 2018. PubMed 29990473
- EFSA Panel on Nutrition, Novel Foods and Food Allergens (Turck D, et al.). “Scientific opinion on the relationship between intake of alpha-lipoic acid (thioctic acid) and the risk of insulin autoimmune syndrome.” EFSA J. 2021. PubMed 34122657
- Testing list: NSF/ANSI 173, read August 25, 2026. Milligrams, capsules and prices from each brand’s own page (NOW: iHerb).