What it is
Horsetail is Equisetum arvense, a silica-containing botanical; extract identity and thiaminase control matter.
Core function and why it is studied
Its composition or proposed mechanism makes skin, hair, and nail structure, bone and mineral physiology logical research areas. Studies therefore examine hair, nail, bone, and fluid-balance measures. That biological connection explains why it is studied; it does not by itself establish a meaningful benefit.
What the evidence means
Reliable direct human evidence is not sufficient to support a product-wide benefit claim. Laboratory, animal, or traditional-use evidence should not be presented as a demonstrated human outcome.
How to compare products
Compare species, plant part, extract ratio, solvent, standardized constituents, serving amount, and contaminant testing.
