Short answer: Horsetail Extract is a botanical traditionally used to support hair, skin and nail strength and resilience.
Why "traditionally used" is a careful, honest qualifier
This phrasing reflects Horsetail's historical reputation without overstating a specific, guaranteed modern clinical mechanism for the finished capsule.
Why this ingredient rounds out the formula's hair-and-nail focus
Biotin and Horsetail Extract work together to support stronger, healthier-looking hair and nails — one of the formula's six stated supporting roles.
💡 Worth knowing: exact per-capsule amounts are on the product label — worth checking your own bottle for the specific figure.