Glycine vs Magnesium

for sleep

Stronger evidence: Magnesium

Stronger effect: Magnesium

Safety: Magnesium carries a minor interaction; Glycine has none recorded.

For sleep, Magnesium has the stronger evidence grade.

grade C low certainty

small trials suggest improved subjective sleep quality and reduced next-day fatigue

3 g before bed, adults

grade B moderate certainty

modest improvement in sleep

200–400 mg, glycinate, adults

sources: PMID:10000002 · PMID:00000001