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Can You Take L-Serine and L-Tryptophan Together?
May affect absorption
The short answer
L-Serine and L-Tryptophan compete for overlapping amino acid transporters (System ASC). High-dose serine supplementation may reduce tryptophan absorption, potentially affecting serotonin production.
How to arrange timing
Separate L-Serine and L-Tryptophan by at least 1 hour for optimal absorption.
Reference
Reference noted for this combination: Bröer S. Amino acid transport across mammalian intestinal and renal epithelia. Physiol Rev. 2008;88(1):249-286.
Important context
Whether supplements suit you together also depends on 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.