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    cholinergic
    beginner
    semi synthetic

    Alpha-GPC

    Most bioavailable choline source. Rapidly crosses the BBB to boost acetylcholine. Essential companion for racetams.

    4h half-life 20min onset water-soluble moderate

    Quick Facts

    Common Dose

    300mg

    Dose Range

    150–600mg

    Frequency

    1-2x daily

    Half-Life

    4 hours

    Onset

    20 min

    Duration

    5 hours

    Cycling

    Not required

    Legal Status

    otc_supplement

    How It Works

    Delivers choline directly to the brain for acetylcholine synthesis. Also provides glycerophosphate for cell membrane phospholipid synthesis.

    Neurotransmitter Pathways

    acetylcholine

    Effects & Benefits

    memory
    focus
    learning
    physical_power_output

    Dosing Guide

    Beginner
    150mg
    Standard
    300mg
    Advanced
    600mg

    ⚠️ Start low and increase gradually. Individual responses vary.

    Side Effects & Safety

    Potential Side Effects

    Headache (too much choline)GI upsetFishy body odor at high doses

    Contraindications

    History of depression

    Drug Interactions

    anticholinergicsscopolamine

    What the Community Says

    "Considered essential when using racetams. Users debate Alpha-GPC vs CDP-Choline — Alpha-GPC hits harder for acute focus."

    positive
    Community ranking: #6 most discussed

    Based on analysis of r/Nootropics, r/StackAdvice, and r/biohackers

    Research & Evidence

    Alpha-GPC effect on muscular strength and power

    2015 — JISSN

    600mg improved strength and growth hormone secretion

    PubMed

    Best Stacked With

    Avoid Pairing With

    Where to Buy

    Estimated cost: $18/month

    Cycling Protocol

    No cycling required — can be taken daily.

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    Frequently Asked Questions

    Related Guides & Articles

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