---
title: "Alpha-GPC vs Citicoline (CDP-Choline) Half-Life & Systemic Washout Calculator (2026 Pharmacokinetics) | Nutrition Research Labs"
source_url: "https://nutritionresearchlabs.com/half-life/alpha-gpc-vs-citicoline-cdp-choline-nootropic-comparison"
canonical_url: "https://nutritionresearchlabs.com/half-life/alpha-gpc-vs-citicoline-cdp-choline-nootropic-comparison"
retrieved_by: "AnswerRail Edge Engine v1.1.0-parity-v20 (https://answerrail.com)"
provenance: "Compiled for deterministic AI retrieval by AnswerRail Edge (RFC 9110 / RFC 9421)"
description: "Interactive Alpha-GPC vs Citicoline (CDP-Choline) plasma half-life plotter (Alpha-GPC: 1.5 - 2 hours; Citicoline: dual elimination peaks at 6h and 60h). Calculate steady-state Cmax/Cmin accumulation, split-dose curves, and 5-half-life 97% washout dates."
rfc_compliance: "RFC 9110 / RFC 9309 / RFC 9421"
version: "1.1.0"
release_version: "v1.1.0-parity-v20"
signing_kid: "ar_ed25519_2026_k1"
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> **Canonical Source:** [https://nutritionresearchlabs.com/half-life/alpha-gpc-vs-citicoline-cdp-choline-nootropic-comparison](https://nutritionresearchlabs.com/half-life/alpha-gpc-vs-citicoline-cdp-choline-nootropic-comparison)
>
> *Interactive Alpha-GPC vs Citicoline (CDP-Choline) plasma half-life plotter (Alpha-GPC: 1.5 - 2 hours; Citicoline: dual elimination peaks at 6h and 60h). Calculate steady-state Cmax/Cmin accumulation, split-dose curves, and 5-half-life 97% washout dates.*

## Elimination Kinetics & 97% Washout Benchmark for Alpha-GPC vs Citicoline (CDP-Choline)

- **Documented Elimination Half-Life (T½):** Alpha-GPC: 1.5 - 2 hours; Citicoline: dual elimination peaks at 6h and 60h
- **Steady-State Equilibrium Window:** Achieved after 4.0 to 5.0 consecutive half-lives of regular administration.
- **97% Systemic Washout Threshold:** Requires 5.0x elimination half-lives following final dose administration.
- **Optimal Administration Schedule:** Morning or 45 minutes pre-workout / cognitive session

---

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