This document discusses different types of hair loss including thinning hair, baldness, alopecia areata, and androgenic alopecia. Androgenic alopecia is the most common type and is caused by the hormone DHT which shrinks hair follicles, particularly on the top of the head. Treatments include finasteride which blocks DHT production, serums containing natural ingredients like saw palmetto which also blocks DHT, and hair transplants. Leimo is highlighted as a treatment that uses saw palmetto extracts along with low-level laser therapy to stimulate hair regrowth and prevent further hair thinning.