Horsetail (Equisetum arvense) has been around for roughly 300 million years, which makes it older than dinosaurs and most things you'd call ancient. It earned a more practical nickname too — "scouring rush" — because its rough, silica-packed stems were used to scrub pots and polish wood before steel wool existed.

That same silica is why we use it. Horsetail contains more usable silica than almost any other plant. Silica is a building block of connective tissue — skin, hair, nails, the works. That's why it shows up in formulas aimed at skin firmness and stronger-feeling hair.

This isn't a fast ingredient. Silica feeds a slow structural process, not something that sits on top of skin and does something visible overnight. If you want an instant fix, horsetail isn't it. If you want something that does real, slow work, it is.

Horsetail also contains flavonoids, tannins, and minerals like potassium and calcium, which round out its antioxidant profile.

We use horsetail topically — infused into oil, then into a balm or scalp treatment. We don't make or sell anything for internal use, and we're not going to pretend we're qualified to advise on horsetail tea or tinctures. That's a different category with a different set of risks, and it's not ours to weigh in on.