Comparison
Alpha-GPC vs Phosphatidylserine (PS)
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.
Phosphatidylserine (PS)
Phospholipid concentrated in brain cell membranes. Supports membrane fluidity and stress response.
| Field | Alpha-GPC | Phosphatidylserine (PS) |
|---|---|---|
| Category | cholinergic | cholinergic |
| Dose range | 300–600mg | 100–300mg |
| Half-life | 6h | 12h |
| Onset | 30min | — |
| Evidence | EVIDENCEA | EVIDENCEB |
| Safety | ●●●●● | ●●●●● |
| Legal (US) | USOTC | USOTC |
| PubMed refs | 320 | 280 |
The comparison in plain English
Auto-generated from dataAlpha-GPC and Phosphatidylserine (PS) are both in the cholinergic category respectively. Alpha-GPC The most bioavailable common choline source. Phosphatidylserine (PS) Phospholipid concentrated in brain cell membranes.
Bottom line
Alpha-GPC (evidence A, safety 5/5) has a weaker evidence base than Phosphatidylserine (PS) (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 Phosphatidylserine (PS) if
Phosphatidylserine (PS) is the better fit when your goal aligns with its mechanism (A structural phospholipid that comprises 10-20% of neuronal cell membranes, particularly concentrated in the inner leaflet where it supports receptor function and membrane fluidity) and the dose range (100–300mg) suits your protocol. Half-life is 12h.