Botanical
Horsetail
Horsetail, Equisetum arvense, is a fern-like plant that reproduces by spores and is rich in silica. Its above-ground parts are used in herbal medicine.
Also listed as Horsetail Powder, Horsetail Extract, Organic Horsetail, Organic Horsetail Powder
What it is studied for
The strongest rated effects first. Bars show the size of the effect, the letter grades the evidence, and each rating lists the studies behind it.
Every rating with its studiesGrouped by health goal, with the publications behind each rating
Why people take it
Essential Health21.2%
Immune Support15%
Hair & Skin14.6%
Bone & Joint8.4%
Energy7.9%
Detox7.6%
SuppCo community snapshot, 2026-09-28. Reasons for use are not evidence that it works.