Comparison
Phenibut vs Caffeine
Phenibut
Russian GABA-B agonist. Anxiolytic and sleep-promoting, but with significant dependence risk. Banned as a supplement in the US/AU.
Caffeine
The most widely consumed psychoactive substance in human history — roughly 80% of the global population uses it daily, mostly via coffee and tea. A competitive adenosine receptor antagonist that lifts the brake on dopamine and norepinephrine signalling. The canonical pairing is 100 mg caffeine + 200 mg L-theanine for clean focus without the jitter.
| Field | Phenibut | Caffeine |
|---|---|---|
| Category | research_chemical | stimulant |
| Dose range | 250–1000mg | 50–400mg |
| Half-life | 5h | 5h |
| Onset | 120min | 30min |
| Evidence | EVIDENCEC | EVIDENCEA |
| Safety | ●○○○○ | ●●●●○ |
| Legal (US) | USResearch chemical | USOTC |
| PubMed refs | 110 | 25000 |
The comparison in plain English
Auto-generated from dataPhenibut and Caffeine are both in the research_chemical (research_chemical) and stimulant respectively. Phenibut Russian GABA-B agonist. Caffeine The most widely consumed psychoactive substance in human history — roughly 80% of the global population uses it daily, mostly via coffee and tea.
Bottom line
Phenibut (evidence C, safety 1/5) has a stronger evidence base than Caffeine (evidence A, safety 4/5). Caffeine has the slightly cleaner safety profile. For users new to either, the higher-evidence option is the safer first try.
Choose Phenibut if
Phenibut is the better fit when your goal aligns with its mechanism (Direct agonist at GABA-B receptors — the same mechanism as the prescription anti-spasticity drug baclofen) and the dose range (250–1000mg) suits your protocol. Half-life is 5h.
Choose Caffeine if
Caffeine is the better fit when your goal aligns with its mechanism (Competitively blocks adenosine A1 and A2A receptors) and the dose range (50–400mg) suits your protocol. Half-life is 5h.