Comparison
Citicoline vs L-Theanine
Side-by-side of Citicoline and L-Theanine. Every row below is pulled from the compound schema and will update as our data grows. For deeper reads, follow through to each compound page.
Citicoline
Citicoline supplement profile: CDP-choline as a phosphatidylcholine precursor, Cognizin dosing 250-2000 mg, cognition trials, stroke recovery evidence.
L-Theanine
L-theanine is a non-protein amino acid found in tea leaves. The most-replicated nootropic; pairs with caffeine at 1:1 (100-200 mg each) for acute focus.
Effects at a glance
Citicoline
- •Choline donor and phosphatidylcholine precursor; oral bioavailability roughly 99%
- •Standard prescription medication for stroke recovery and vascular cognitive impairment in much of the world
- •Healthy-adult cognitive trials (Cognizin) report small gains in attention and working memory at 250 to 500 mg/day
- •ICTUS trial (n=2,298) was negative on stroke recovery in the modern thrombolysis era
- •Lower per-gram choline content than alpha-GPC (~18% vs ~40%), meaning smaller TMAO load at equivalent dose
- •Long uridine half-life (~56 hours) supports once or twice daily dosing
L-Theanine
- •Non-protein amino acid in tea; the most-replicated nootropic in the human RCT literature
- •Caffeine + theanine at 1:1 (100-200 mg each) is the gold-standard acute focus stack
- •Solo doses of 200-400 mg reduce subjective stress and improve sleep quality
- •Increases alpha-wave EEG activity within 30-45 minutes of 200 mg oral dose
- •Crosses blood-brain barrier; bioavailability high, half-life 60-90 minutes
- •Clean safety record; minimal interactions at supplement doses
Side-by-side
| Attribute | Citicoline | L-Theanine |
|---|---|---|
| Category | supplement | supplement |
| Also known as | CDP-choline, cytidine 5'-diphosphocholine, Cognizin | theanine, gamma-glutamylethylamide |
| Half-life (hr) ↗ | 56 | 1.5 |
| Typical dose (mg) ↗ | 500 | 200 |
| Dosing frequency | 1 to 2 times daily | as needed (with caffeine) or daily |
| Routes | oral, intravenous | oral |
| Onset (hr) | 1 | 0.5 |
| Peak (hr) | 2 | 1 |
| Molecular weight | 488.32 | 174.2 |
| Molecular formula | C14H26N4O11P2 | C7H14N2O3 |
| Mechanism | Hydrolyzed to cytidine and choline after absorption; both cross the blood-brain barrier and are recombined intracellularly to reform CDP-choline, supporting phosphatidylcholine synthesis and acetylcholine production. | Crosses BBB; modulates GABA/dopamine/serotonin (modest); increases alpha-wave EEG activity; dampens stress-induced sympathetic response without sedation. |
| Legal status | Dietary supplement (US, Cognizin GRAS); prescription medication in most of the world | OTC dietary supplement |
| WADA status | allowed | allowed |
| DEA / Rx | OTC supplement (US); Rx in most of the world | OTC supplement |
| Pregnancy | Insufficient data for routine use | Insufficient supplement-dose data; tea-source intake safe |
| CAS | 987-78-0 | 3081-61-6 |
| PubChem CID | 13804 | 439378 |
| Wikidata | Q411470 | Q909931 |
Safety profile
Citicoline
Common side effects
- mild GI upset
- headache
- restlessness
- occasional insomnia with evening dosing
Contraindications
- concurrent strong anticholinergic therapy
- established cardiovascular disease (TMAO concern, smaller than alpha-GPC)
Interactions
- anticholinergic medications: partial mutual antagonism(minor)
- cholinesterase inhibitors: additive cholinergic effect(minor)
- antimetabolite chemotherapy (5-FU): theoretical cytidine pathway interaction(minor)
L-Theanine
Common side effects
- mild GI upset (rare)
- headache (rare)
Contraindications
- pregnancy / lactation (insufficient data at supplement doses)
- concurrent strong GABAergics without caution
Interactions
- caffeine: synergistic for acute focus; dampens jitter without blunting alertness(minor)
- benzodiazepines / alcohol: potential additive sedation(minor)
Which Should You Take?
L-Theanine comes out ahead for most readers on the criteria we weight: 3 catalogued goals, OTC dietary supplement, oral dosing, with a Tier-A outcome catalogued. Citicoline is the right call when one of the conditionals below applies.
- → If your priority is stroke recovery, pick Citicoline.
- → If your priority is choline supply, pick Citicoline.
- → If your priority is stress and HPA-axis regulation, pick L-Theanine.
- → If your priority is sleep onset or sleep quality, pick L-Theanine.
Edge case: Half-lives differ materially (Citicoline ~56 hr vs L-Theanine ~1.5 hr). Citicoline reaches steady state faster; L-Theanine is easier to dial in if tolerability is uncertain.
Default choice: L-Theanine. Lower friction to source, a Tier-A evidence outcome catalogued, and broader goal coverage. Reach for Citicoline only if your priority sits squarely in the goals it owns above.
This verdict is generated from each compound's schema (goals, legal status, evidence outcomes, dosing route). It updates automatically as our compound data evolves; the deeper read sits on each individual compound page.
Common questions
What is the difference between Citicoline and L-Theanine?
Citicoline and L-Theanine differ in category (supplement vs supplement), mechanism, and typical dosing. See the side-by-side table for full details.
Which has a longer half-life, Citicoline or L-Theanine?
Citicoline half-life is 56 hours; L-Theanine half-life is 1.5 hours.
Can you stack Citicoline with L-Theanine?
Stack compatibility depends on mechanism overlap, legal status, and individual response. Check each compound page for specific interactions and contraindications before combining.
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