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Alpha-GPC vs Modafinil: side-by-side comparison

Other

L-Alpha glycerylphosphorylcholine · Choline alfoscerate · sn-glycero-3-phosphocholine

A natural choline compound found in the brain that acts as an acetylcholine precursor. Alpha-GPC rapidly delivers choline across the blood-brain barrier, where it is used to make acetylcholine. It is sold as a nootropic/pre-workout supplement and, in several countries, prescribed as choline alfoscerate for cognitive decline.

1.0/10 natty
Full breakdown →
VS
Other

Provigil · Modalert · Alertec

A wakefulness-promoting medication approved for excessive sleepiness from narcolepsy, obstructive sleep apnea and shift work sleep disorder. Described as a CNS stimulant / atypical dopamine reuptake inhibitor, it is widely used off-label as a cognitive enhancer. Approved in the US in 1998 and sold as Provigil among other brands.

1.0/10 natty
Full breakdown →

1 / 10 natty scale / 1

Same lane

Both sit in the same class and are run for performance, health. This is a like-for-like comparison: read the gaps as real trade-offs.

The tape

Core ratings

The same three rulers every entry on the site is scored with, read head to head.

Alpha-GPCModafinil
1.0

Natty scale

1 natural · 10 heavy

1.0
3.0

Effectiveness

Documented effect · of 5Δ1

4.0
2.0

Side-effect severity

Documented burden · of 5Δ0.5

2.5

Cost side

Body-load fingerprint

Where each one actually lands its strain, on the calculator's thirteen channels. Tap a row for what it means and which labs track it.

Alpha-GPCModafinil

Systemic

Bars show strain at each one's typical protocol, not your dose. ≈ marks values inferred from side-effect data or category rather than hand-graded. For your numbers, run the calculator.

Logistics

The vitals

Alpha-GPCModafinil
Other
Classmatch
Other
Oral
Routematch
Oral
300-630 mg/dayOnce daily (or pre-workout/pre-study); clinical dementia dosing is typically split 2-3x/day
Typical dose
100-400 mg/dayOnce daily in the morning (narcolepsy/OSA); ~1 hour before a shift (shift work sleep disorder)
~4-8 hours
Half-life
12-15 hours
4-12 weeks
Typical run
1-12 weeks
OTC supplement
Legal status
Controlled substance
Not prohibited
WADA
ProhibitedS6. Stimulants

Benefit side

What each is for

Shared goals carry both dots; a goal with one dot belongs to that side alone.

Alpha-GPCModafinil
PerformanceHealth

Run for

Cognitive SupportUsed to support memory and cognition. A 2023 meta-analysis found alpha-GPC improved cognitive function and daily living in dementia of neurological origin, vascular dementia and Alzheimer's disease; an acute RCT in healthy men improved a cognitive (Stroop) test.
Choline Source for Nootropic StacksA go-to choline donor stacked with racetams (e.g. phenylpiracetam) and other nootropics to supply acetylcholine and blunt racetam 'choline headaches'.
Pre-Workout / Possible Acute GH BumpPopular in pre-workouts. An older study reported alpha-GPC augments the growth-hormone response to GHRH - but see the honest evidence flags: a 2024 exercise RCT found no GH or physical-performance effect.

Documented upside

  • Effective, bioavailable choline source that crosses the blood-brain barrier
  • Meta-analysis support for cognition in dementia populations
  • Acute cognitive (Stroop) improvement shown in healthy men
  • Pairs with racetams to reduce choline-depletion headaches
  • Generally well tolerated; FDA GRAS at up to ~196mg/day

Run for

Excessive Daytime SleepinessFDA-approved to treat excessive sleepiness caused by narcolepsy and obstructive sleep apnea/hypopnea syndrome.
Shift Work Sleep DisorderApproved for shift work sleep disorder; taken about 1 hour before the start of a work shift.
Off-Label Cognitive EnhancementUsed off-label as a cognitive enhancer by students and professionals seeking improved focus and sustained wakefulness.

Documented upside

  • Strong, sustained wakefulness without the crash of classic stimulants
  • Improved focus and reduced fatigue (basis of off-label cognitive use)
  • FDA-approved and well-characterised for sleep disorders
  • Long half-life gives all-day coverage from a single morning dose
  • Generally well tolerated at standard doses

The downsides

Side effects, aligned

Each entry's documented side effects, sorted onto the same body systems so the gaps and the overlaps are visible. Tap any effect for the detail.

Alpha-GPCModafinil

None documented

Mood, sleep & CNS
Other documented effects

The exit

Hormonal fallout & recovery

What each does to your own hormone axis while on, and what leaving it costs.

Alpha-GPCModafinil
Not required
PCT
Not required
While-on only
What sticks
While-on only

Alpha-GPC

Not a hormone and does not affect the HPTA. No PCT required.

Modafinil

Not a hormone and does not affect the HPTA. No PCT required.

Read-out

How they separate

  1. 01

    Enhancement

    They land at almost the same point on the natty scale (1/10 vs 1/10): a similar distance beyond natural.

  2. 02

    Side-effect bill

    Modafinil's documented side-effect severity is heavier (2.5/5 vs 2/5). The body-load fingerprint above shows where that weight actually lands.

  3. 03

    Body load

    The widest gap at typical protocols is mood & sleep (Modafinil 3.2/10 vs 0/10).

  4. 04

    Coming off

    Neither requires PCT: both leave the natural testosterone axis running.

  5. 05

    Logistics

    typical runs are 4-12 weeks vs 1-12 weeks.

  6. 06

    Tested athletes

    Modafinil is WADA-prohibited; Alpha-GPC is not on the prohibited list.

Generated from each entry's data file. Descriptive, not a recommendation; nothing here is medical advice.

Full breakdownAlpha-GPC→Full breakdownModafinil→

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