Saw palmetto is a type of palm tree that grows in the warm climate of the southeast coast of the U.S.

Saw palmetto remedies contain an extract taken from the berries of the tree. Traditionally, Native Americans of the Seminole tribe ate berries from the saw palmetto tree to ease urinary and reproductive problems, among other ailments.

An extract of saw palmetto berries may block 5-alpha-reductase, an enzyme that converts testosterone to DHT. DHT is the molecule responsible for hair loss.

Research: https://hairgenx.co.za/scientific-research-for-thinning-hair/ para 6.