Alpha-GPC supplements
Alpha-GPC works through daily use over weeks, so what matters is how much you take in a day. For each product we take the label's own directions (how much per serving, how many servings a day) and compare the daily amount with what studies use: 250–600 mg/day. Products that reach that range when taken as directed come first, then by the least their directions give a day (counted only up to the top of the range); commission never changes the order.
| Product | Per serving | Servings a day | Per day, as directed | Verdict | Proof |
|---|---|---|---|---|---|
| Double Wood Alpha-GPC 300 mg · label 22 Aug 2024 | 600 mg in 2 capsules | 1 serving | 600 mg | Effective dose | Label claim only |
| NOW Alpha GPC 300 mg · label 22 May 2016 | 600 mg in 2 capsules | 2 servings | 1.2 g | Effective dose | Label claim only |
| Nutricost Alpha GPC 600 mg · label 16 Jun 2022 | 600 mg in 2 capsules | 1 serving | 600 mg | Effective dose | Label claim only |
| Pure Encapsulations Alpha-GPC · label 25 Mar 2021 | 400 mg in 2 capsules | 3 servings | 1.2 g | Effective dose | Label claim only |
| BulkSupplements Alpha GPC 300 mg Capsules · label 24 Apr 2025 | 300 mg in 2 capsules | 1 serving | 300 mg | Effective dose | Label claim only |
| Jarrow Formulas Alpha GPC 300 mg · label 24 Jan 2024 | 300 mg in 1 capsule | 1–2 servings | 300–600 mg | Effective dose | Label claim only |
| NutraBio Alpha GPC · label 23 Apr 2024 | 300 mg in 1 capsule | 1–2 servings | 300–600 mg | Effective dose | Label claim only |
| Swanson Alpha-GPC 300 mg · label 16 Jun 2022 | 300 mg in 1 capsule | 1–2 servings | 300–600 mg | Effective dose | Label claim only |
| Nootropics Depot Alpha GPC 150 mg Capsules · label 21 Dec 2024 | 150 mg in 1 capsule | 1–2 servings | 150–300 mg | Effective dose | Label claim only |
9 products. Where the directions give a range, the verdict judges the most they give in a day. Read the alpha-gpc guide for the studies behind the dose. "Proof" is a published independent lab test, a certifier listing we read on the certifier's own site (usually for listed lots only), or "Label claim only" when we found neither.