Horsetail aerial parts extract concentrates silica and flavonoids from the Equisetum arvense plant. Many people take it to support collagen production and maintain healthy skin, hair, and nails. Others use it as a mild diuretic or for connective tissue and joint support. An extract offers more consistent, higher-potency dosing than raw herb or tea. Take it with a meal to aid absorption.
Prolonged use can deplete thiamine (vitamin B1) and potassium. Keep away from this supplement if you have kidney disorders, as it may make the condition worse. Talk to your healthcare provider before starting horsetail if you use diuretics or have a history of kidney disease.