Comparison
Alpha-Lipoic Acid vs Acetyl-L-Carnitine (ALCAR)
Alpha-Lipoic Acid
Universal antioxidant active in both lipid and aqueous environments. Supports mitochondrial function and AGE reduction.
Acetyl-L-Carnitine (ALCAR)
Acetylated form of L-carnitine that crosses the BBB. Donates an acetyl group for ACh synthesis and supports mitochondrial fatty-acid transport.
| Field | Alpha-Lipoic Acid | Acetyl-L-Carnitine (ALCAR) |
|---|---|---|
| Category | neuroprotective | cholinergic |
| Dose range | 300–600mg | 500–2000mg |
| Half-life | 1h | 4h |
| Onset | – | 60min |
| Evidence | EVIDENCEA | EVIDENCEB |
| Safety | ●●●●○ | ●●●●● |
| Legal (US) | USOTC | USOTC |
| PubMed refs | 1900 | 600 |
The comparison in plain English
Auto-generated from dataAlpha-Lipoic Acid and Acetyl-L-Carnitine (ALCAR) are both in the neuroprotective (neuroprotective) and cholinergic respectively. Alpha-Lipoic Acid Universal antioxidant active in both lipid and aqueous environments. Acetyl-L-Carnitine (ALCAR) Acetylated form of L-carnitine that crosses the BBB.
Bottom line
Alpha-Lipoic Acid (evidence A, safety 4/5) has a weaker evidence base than Acetyl-L-Carnitine (ALCAR) (evidence B, safety 5/5). Acetyl-L-Carnitine (ALCAR) has the slightly cleaner safety profile. For users new to either, the higher-evidence option is the safer first try.
Choose Alpha-Lipoic Acid if
Alpha-Lipoic Acid is the better fit when your goal aligns with its mechanism (A 'universal' antioxidant, uniquely active in both lipid (cell membrane) and aqueous (cytoplasm) environments because of its dithiol functional group) and the dose range (300–600mg) suits your protocol. Half-life is 1h.
Choose Acetyl-L-Carnitine (ALCAR) if
Acetyl-L-Carnitine (ALCAR) is the better fit when your goal aligns with its mechanism (Donates an acetyl group that can be used in acetylcholine synthesis, a direct cholinergic input distinct from phospholipid choline sources) and the dose range (500–2000mg) suits your protocol. Half-life is 4h.