Can You Take Calcium and Horsetail Extract Together?

Dose or timing may matter

The short answer

Horsetail's diuretic effect increases urinary calcium excretion. When supplementing calcium, this can raise urinary calcium concentration and increase kidney stone risk during diuresis.

How to arrange timing

Drink extra water when using horsetail with calcium. Consider taking them at different times.

Reference

Reference noted for this combination: Carneiro DM et al. Evid Based Complement Alternat Med. 2014;2014:760683; Curhan GC et al. N Engl J Med. 1993;328(12):833-838

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.