Can You Take Calcium and L-Threonate Together?

May affect absorption

The short answer

Calcium can compete with L-Threonate (typically as magnesium L-threonate) for divalent cation absorption pathways. High-dose calcium may reduce the absorption of the magnesium component of L-Threonate supplements.

How to arrange timing

Separate calcium and L-Threonate (magnesium L-threonate) by at least 2 hours for optimal absorption.

Reference

Reference noted for this combination: NIH Office of Dietary Supplements – Magnesium Fact Sheet. https://ods.od.nih.gov/factsheets/Magnesium-HealthProfessional/

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.