Positives

• Adults taking 200 to 400 mg daily reported drops in self-rated anxiety, depression, and sleep disturbance after four weeks PMC.
  
  
• A first-time user described falling asleep surprisingly easily and feeling deeply relaxed without grogginess PMC.
  
  

Negatives

• Patients given 900 mg/day tolerated it physically but reported no anxiety relief, suggesting a ceiling effect PubMed.
  
  
• Some users reported the relaxation never converted into anxiolysis when facing an actual stressor Drugs.com.
  
  

Hurdles & Side Effects

• Patients pay a premium for the patented Suntheanine form even though many studies use generic L-theanine PubMed.
  
  
• Effects are subtle, leaving anxious patients unsure whether the supplement is working at all PubMed.