HEAD-TO-HEAD · UPDATED 2026-07-03

Life Extension Neuro-Mag Magnesium L-Threonate vs NOW Foods L-Theanine 200mg (120ct)

Spec-based scoring, dimension-by-dimension verdicts, and honest deal breakers. Total cost of ownership over 3 years included.

Life Extension

Life Extension Neuro-Mag Magnesium L-Threonate

$30.78

(Amazon price as of Oct 31, 20:29 UTC – Details)

NOW Foods

NOW Foods L-Theanine 200mg (120ct)

$15.78

(Amazon price as of Oct 31, 20:29 UTC – Details)

Our pick · overall

NOW Foods L-Theanine 200mg (120ct)

Wins on editor score (8.4/10 vs 8.1/10) and long-term value. Best for: Theanine at the lowest cost per capsule.

$15.78 (Amazon price as of Oct 31, 20:29 UTC – Details)vs $30.78 (Amazon price as of Oct 31, 20:29 UTC – Details)

Side by side

Spec	Life Extension	NOW Foods
Best price today	$30.78 (Amazon price as of Oct 31, 20:29 UTC – Details)	$15.78 (Amazon price as of Oct 31, 20:29 UTC – Details)wins
Editor score	8.1/10	8.4/10wins
Shopper rating	4.4 (12,000)	4.7 (12,840)wins
Subscription	None	None