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.