L-Theanine vs Magnesium
for stress
Stronger evidence: tie
Stronger effect: Magnesium
Safety: Both carry up to minor interactions — check your context.
For stress, the two are evidence-matched; the difference is in effect and safety.
L-Theanine
grade C low certainty
small calming effect; often paired with caffeine to smooth its edge
100–200 mg
Magnesium
grade C low certainty
may modestly reduce subjective anxiety/stress, esp. in deficiency
200–400 mg, adults
sources: PMID:00000022 · PMID:20000101