Comparison
Alpha-GPC vs Phosphatidylcholine (Lecithin)
Alpha-GPC
The most bioavailable common choline source. About 40% of an oral dose reaches the brain within an hour, where it serves as substrate for acetylcholine synthesis and as a phospholipid membrane component. The de facto pairing for every racetam stack.
Phosphatidylcholine (Lecithin)
Major phospholipid in cell membranes and a choline source. Less potent than Alpha-GPC or CDP-choline but cheaper and more widely available.
| Field | Alpha-GPC | Phosphatidylcholine (Lecithin) |
|---|---|---|
| Category | cholinergic | cholinergic |
| Dose range | 300–600mg | 500–3000mg |
| Half-life | 6h | — |
| Onset | 30min | — |
| Evidence | EVIDENCEA | EVIDENCEB |
| Safety | ●●●●● | ●●●●● |
| Legal (US) | USOTC | USOTC |
| PubMed refs | 320 | 4800 |
The comparison in plain English
Auto-generated from dataAlpha-GPC and Phosphatidylcholine (Lecithin) are both in the cholinergic category respectively. Alpha-GPC The most bioavailable common choline source. Phosphatidylcholine (Lecithin) Major phospholipid in cell membranes and a choline source.
Bottom line
Alpha-GPC (evidence A, safety 5/5) has a weaker evidence base than Phosphatidylcholine (Lecithin) (evidence B, safety 5/5). Alpha-GPC has the slightly cleaner safety profile. For users new to either, the higher-evidence option is the safer first try.
Choose Alpha-GPC if
Alpha-GPC is the better fit when your goal aligns with its mechanism (Rapidly absorbed and cleaved into choline and glycerophosphate) and the dose range (300–600mg) suits your protocol. Half-life is 6h.
Choose Phosphatidylcholine (Lecithin) if
Phosphatidylcholine (Lecithin) is the better fit when your goal aligns with its mechanism (Provides choline for acetylcholine synthesis through enzymatic cleavage, similar mechanism to Alpha-GPC but with lower bioavailability) and the dose range (500–3000mg) suits your protocol. Half-life is —h.