There are  a lot of herbs that are reputed to aid weight loss, though effectiveness can vary. Some highly regarded herbs include:

Green Tea: Contains catechins that may boost metabolism.
Garcinia Cambogia: May inhibit fat production and suppress appetite.
Ginseng: Can enhance energy levels and support metabolism.
Cayenne Pepper: Contains capsaicin, which may aid in fat burning.
Cinnamon: Helps regulate blood sugar levels, potentially reducing cravings.