Does L-Theanine Actually Work? A Blinded Self-Experiment Yields Surprising Results
2025-03-09
The author, a long-time user of L-theanine supplements, believed in its anxiety and stress-reducing effects. To test this, they conducted a 16-month double-blind experiment, comparing L-theanine against a vitamin D placebo. Surprisingly, L-theanine showed no significant benefit over the placebo. While statistically, stress levels decreased slightly after taking L-theanine, the placebo group showed a similar trend. The author couldn't reliably distinguish between L-theanine and the placebo. This casts doubt on L-theanine's efficacy and encourages further blinded studies to verify its purported benefits.