Swanson · Alpha-GPC · Capsules
Is Swanson Alpha-GPC 300 mg underdosed?
1 serving = 1 capsuleDirections: 1–2 servings a dayLabel as of 16 Jun 2022 · NIH DSLD
Verdict
300–600 mg a dayas the label directs · studies use 250–600 mg/day of alpha-gpc
Effective doseTaken as the label directs (1–2 servings a day, 300 mg each), it gives 300–600 mg a day; studies use 250–600 mg/day.
One capsule gives 300 mg, enough on its own for the low end of what studies use (250 mg); it ranks 8th of 9 alpha-GPC supplements here by dose.
1 capsule a day reaches 250 mg.
What the label says
- Alpha-GPC per serving
- 300 mg in 1 capsule
- Servings a day
- 1–2 servings a day
- Alpha-GPC a day, as directed
- 300–600 mg
- Research dose
- 250–600 mg/day Evidence: Weak
Suggested use: As a dietary supplement, take one veggie capsule one to two times per day with water.
More about alpha-gpc: forms, timing and the studies behind the dose.
Same category, compared
All 9 alpha-GPC supplements we checked, ranked by dose (commission never changes the order). Studies use 250–600 mg/day of alpha-gpc; servings counted to 250 mg.
| Product | Per serving | Servings to reach it | Form |
|---|---|---|---|
| Double Wood Alpha-GPC 300 mg | 600 mg | 1 or less | Capsules |
| NOW Alpha GPC 300 mg | 600 mg | 1 or less | Capsules |
| Nutricost Alpha GPC 600 mg | 600 mg | 1 or less | Capsules |
| Pure Encapsulations Alpha-GPC | 400 mg | 1 or less | Capsules |
| BulkSupplements Alpha GPC 300 mg Capsules | 300 mg | 1 or less | Capsules |
| Jarrow Formulas Alpha GPC 300 mg | 300 mg | 1 or less | Capsules |
| NutraBio Alpha GPC | 300 mg | 1 or less | Capsules |
| Swanson Alpha-GPC 300 mg (this product) | 300 mg | 1 or less | Capsules |
| Nootropics Depot Alpha GPC 150 mg Capsules | 150 mg | 1.7 | Capsules |
Where the reference doses come from
- Alpha-GPC, 250–600 mg/day: Bellar et al., 2015; Marcus et al., 2017.
- Label data: National Institutes of Health, Office of Dietary Supplements. Dietary Supplement Label Database, 2026. https://dsld.od.nih.gov/. Label 264993, including its servings a day.
For a supplement taken every day we judge the most the label's directions give in a day, and show the least. Read the full methodology or the corrections log.