Head to head
Alpha-Lipoic Acid against NAC
Two antioxidants that are also real drugs in some settings, one used for diabetic nerve pain and prescribed in some countries, one approved as an antidote. Both are sold as general purpose supplements on evidence generated for specific conditions.
Column A
Alpha-Lipoic AcidAlpha-Lipoic Acid (ALA, thioctic acid)
A versatile antioxidant compound studied for diabetic nerve pain and metabolic health, sold as a supplement and used as a drug in some countries.
Column B
NACN-Acetylcysteine
A glutathione precursor that is FDA-approved as a mucolytic and antidote for acetaminophen overdose, and studied more broadly in psychiatry and respiratory health.
Side by side, on the facts we can check
| Attribute | Alpha-Lipoic Acid | NAC |
|---|---|---|
| Category | Antioxidant | Antioxidant |
| FDA status | Sold as a supplement in the US; used as a medicine for neuropathy in some countries | FDA-approved (mucolytic; acetaminophen overdose antidote); also sold as a supplement |
| Half-life | ~30 minutes | ~5-6 hours |
| Molecular weight | 206.3 Da | 163.2 Da |
| Mechanism | Acts as a broad-spectrum antioxidant, regenerates vitamins C and E and glutathione, and supports mitochondrial energy metabolism. | Provides cysteine to replenish glutathione, directly scavenges free radicals, and modulates glutamatergic signaling in the brain. |
| Human studies cited | 2 | 3 |
| Legal status, US | Sold as a dietary supplement | FDA-approved drug and sold as a supplement |
Frequently asked questions
What is the difference between Alpha-Lipoic Acid and NAC?
Alpha-Lipoic Acid: A versatile antioxidant compound studied for diabetic nerve pain and metabolic health, sold as a supplement and used as a drug in some countries. NAC: A glutathione precursor that is FDA-approved as a mucolytic and antidote for acetaminophen overdose, and studied more broadly in psychiatry and respiratory health.
Which has stronger research evidence, Alpha-Lipoic Acid or NAC?
This database does not grade compounds. It counts what was run in people: 2 of the 3 studies cited on the Alpha-Lipoic Acid profile were human work, against 3 of 4 for NAC. Those counts are of our own citation lists and understate any larger literature, and neither is a recommendation.
Are Alpha-Lipoic Acid and NAC FDA-approved?
Alpha-Lipoic Acid: Sold as a supplement in the US; used as a medicine for neuropathy in some countries. NAC: FDA-approved (mucolytic; acetaminophen overdose antidote); also sold as a supplement.
Reviewed Sep 2026. This page sets two published records side by side. It is educational, it is not medical advice, and it contains no dosing protocols or recommendations for personal use.