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Compare supplements

Put up to three ingredients next to each other. See where the evidence, dosing, timing, and tradeoffs differ.

Supplement 1Supplement 2Supplement 3

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Evidence

Limited evidence

Common protocol3 g before bed——

Protocols mapped

1 goal-specific

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Timing

30–60 minutes before bed in the sleep studies

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Expected effect

Same night to several consecutive nights in small trials

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Primary uses

Sleep researchNext-day fatigueGlycine intake

Watch for

Nausea · Soft stools

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