Tea Rinsing is said to combat shedding. The picture demonstrates hair loss on separate wash days from pre-wash detangling through post-wash detangling. About 5x more hair on the no tea rinsing wash day was lost! Caffeine is said to block DHT, the hormone responsible for shedding. Both tea and coffee contain caffeine but tea contains more caffeine than a cup of coffee. The belief is that the caffeine within tea and coffee rinsing blocks DHT which combats shedding.