Does Alcohol Affect L-Tryptophan?

Amount or timing may matter

The short answer

Alcohol shifts tryptophan metabolism away from serotonin toward kynurenine pathway, reducing L-tryptophan's mood and sleep benefits.

How to arrange timing

Take L-tryptophan at least 4 hours from alcohol.

Reference

Reference noted for this food and supplement combination: Examine.com 2024

Important context

The effect can also change with food amount, supplement dose, product formulation, health conditions, and medication use. Ask a doctor or pharmacist first if you take medication, are pregnant or breastfeeding, or have a chronic condition.