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L-theanine: what the biggest YouTube health voices say

2 of the biggest YouTube health voices have weighed in on L-theanine: 1 for, 1 it depends, 0 against.

Verdict from 2 voicesDebated
Often taken for: better sleep, less stress, focus. Updated 2026-10-29.

Voice by voice

Huberman Lab 7.98M subscribers
It depends

Huberman Lab’s take: Says theanine helps many people fall asleep, but those with very vivid dreams or waking anxious at night should avoid it.

Mentioned at 9:45 in “Essentials: Developing a Rational Approach to Supplementation for Health & Performance” · 2026-10-22
Thomas DeLauer 4.05M subscribers
For

Thomas DeLauer’s take: Endorses L-theanine as a favourite supplement, citing a study where a 200 mg dose cut cortisol over 40% under stress.

Mentioned at 4:21 in “This Drops Visceral Fat WITHOUT Changing Your Diet (11lbs)” · 2026-09-16

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