Amino AcidsL-Theanine

Theanine alleviates sleep disturbances caused by cumulative stress

Theanine exerts therapeutic effects on mental disorders caused by cumulative stress, ranging from mild sleep disturbances to depression induced by sleep deprivation. The review covers literature from the past 5 years on the neuroprotective functions of theanine.

Last updated: Aug 26, 2026•0 RCTs•📖 Read as article →

Evidence Score

Evidence Score32/100
Human RCT☆☆☆☆☆
Meta-analysis☆☆☆☆☆
Mechanism★★★★★
Safety★★★★☆
Confidencelow

Study Evidence

Study 1. Theanine: a phytochemical candidate for neural protection.

observational

Qiang Y, Luo Q, Zhang J, Ming C, Chong X, Huang F, Gui A, Wang J, Yin H, Ahmad MZ, He HF · Journal of the science of food and agriculture (2026)

Participants: N/A
Duration: N/A
Intervention: Theanine (from Camellia sinensis)
Outcome: Sleep disturbances, mental disorders (including depression induced by sleep deprivation)
Effect Size: N/A
Population: Individuals with cumulative stress (including mild sleep disturbances and sleep deprivation)

Result:

PubMed: 42163019DOI: 10.1002/jsfa.70740

Mechanism Graph

Alleviates neuroinflammation
↓
Reduces oxidative stress-induced ferroptosis in neuronal cells
↓
Modulates neural stem cell differentiation and neural signal transduction pathways
↓
Result: Improved sleep and reduced depression from stress

Limitations

  • ⚠Abstract does not provide specific effect sizes or quantitative results from individual studies
  • ⚠Further investigations are needed for a more rigorous and comprehensive understanding of theanine

Frequently Asked Questions

What is theanine?▼

Theanine is a phytochemical that accumulates in Camellia sinensis (tea plant) and has demonstrated neuroprotective effects.

How does theanine affect sleep?▼

Theanine alleviates neuroinflammation, which helps treat mild sleep disturbances caused by cumulative stress.

Is theanine effective for depression from sleep deprivation?▼

Yes, the abstract states theanine has therapeutic effects on depression induced by sleep deprivation.

What other health benefits does theanine have?▼

It also shows beneficial effects in delaying progression of neurodegenerative diseases like Parkinson's and Alzheimer's, and protects against organ dysfunction from nerve injury.

Products

Affiliate links coming soon. We only recommend products that match the doses and forms used in the cited research.

References

  1. 1.Qiang Y, Luo Q, Zhang J, Ming C, Chong X, Huang F, Gui A, Wang J, Yin H, Ahmad MZ, He HF. "Theanine: a phytochemical candidate for neural protection.." Journal of the science of food and agriculture, 2026. PMID: 42163019 DOI: 10.1002/jsfa.70740
Disclaimer: This content is for educational purposes only and is not medical advice. Evidence scores reflect the quality and quantity of available research, not clinical recommendations. Always consult a healthcare professional before starting any supplement or intervention.