Comparison
L-Theanine vs Noopept
Side-by-side of L-Theanine and Noopept. 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.
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.
Noopept
Noopept cognitive enhancer profile: 10 to 30 mg dosage, dipeptide nootropic mechanism, memory effects, and how it compares to piracetam.
Effects at a glance
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
Noopept
- •Russian dipeptide nootropic developed in the 1990s, registered in Russia 2002 for cognitive impairment
- •Roughly 1,000-fold higher per-mg potency than piracetam; therapeutic dose 10 to 30 mg/day
- •Active metabolite cycloprolylglycine modulates AMPA receptors and increases NGF and BDNF in rodent hippocampus
- •Russian RCTs in stroke recovery and vascular cognitive impairment show modest improvements over 4 to 8 weeks
- •Western evidence base is essentially absent; healthy-adult enhancement trials have not been published
- •Unscheduled in the US but not approved for human consumption; UK is prescription-only since 2014
Side-by-side
| Attribute | L-Theanine | Noopept |
|---|---|---|
| Category | supplement | nootropic |
| Also known as | theanine, gamma-glutamylethylamide | GVS-111, N-phenylacetyl-L-prolylglycine ethyl ester, Omberacetam |
| Half-life (hr) ↗ | 1.5 | 0.7 |
| Typical dose (mg) ↗ | 200 | 20 |
| Dosing frequency | as needed (with caffeine) or daily | 2 to 3 times daily, last dose before mid-afternoon |
| Routes | oral | oral, sublingual |
| Onset (hr) | 0.5 | 0.5 |
| Peak (hr) | 1 | 1 |
| Molecular weight | 174.2 | 318.37 |
| Molecular formula | C7H14N2O3 | C17H22N2O4 |
| Mechanism | Crosses BBB; modulates GABA/dopamine/serotonin (modest); increases alpha-wave EEG activity; dampens stress-induced sympathetic response without sedation. | Hydrolyzed to active metabolite cycloprolylglycine; AMPA receptor modulation, BDNF and NGF upregulation, antioxidant and antiexcitotoxic effects. |
| Legal status | OTC dietary supplement | Approved in Russia and CIS states; prescription-only in UK; unscheduled and unapproved in US, EU varies |
| WADA status | allowed | unknown |
| DEA / Rx | OTC supplement | Not scheduled in the US |
| Pregnancy | Insufficient supplement-dose data; tea-source intake safe | Not recommended |
| CAS | 3081-61-6 | 157115-85-0 |
| PubChem CID | 439378 | 183503 |
| Wikidata | Q909931 | Q4321022 |
Safety profile
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)
Noopept
Common side effects
- headache
- irritability
- sleep disturbance with late-day dosing
- occasional blood pressure elevation
Contraindications
- pregnancy
- lactation
- pediatric use
- severe hepatic impairment
- severe renal impairment
Interactions
- memantine and other glutamatergic agents: theoretical AMPA-pathway interaction(minor)
- antidepressants: theoretical effect via BDNF axis, undocumented(minor)
- antihypertensives: occasional blood pressure elevation may require monitoring(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. Noopept is the right call when one of the conditionals below applies.
- → If your priority is sleep onset or sleep quality, pick L-Theanine.
- → If your priority is memory, pick Noopept.
- → If your priority is focus or working memory, pick L-Theanine.
Edge case: If you want to avoid controlled substance, L-Theanine is the more accessible choice.
Default choice: L-Theanine. Lower friction to source, a Tier-A evidence outcome catalogued, and broader goal coverage. Reach for Noopept 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 L-Theanine and Noopept?
L-Theanine and Noopept differ in category (supplement vs nootropic), mechanism, and typical dosing. See the side-by-side table for full details.
Which has a longer half-life, L-Theanine or Noopept?
L-Theanine half-life is 1.5 hours; Noopept half-life is 0.7 hours.
Can you stack L-Theanine with Noopept?
Stack compatibility depends on mechanism overlap, legal status, and individual response. Check each compound page for specific interactions and contraindications before combining.
Go deeper