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- Hawthorn (specifically Crataegus monogyna and Crataegus laevigata) fruit has been used since the first century for heart disease. Other uses include digestive and kidney problems.
- Hoodia (Hoodia gordonii) is traditionally used by Kalahari Bushmen to reduce hunger and thirst. It is currently marketed as an appetite suppressant.
- Horse chestnut (Aesculus hippocastanum) seeds, leaves, bark, and flowers have been used medicinally for many centuries. The raw plant materials are toxic unless processed.
- Horsetail (Equisetum arvense) dates back to ancient Roman and Greek medicine, when it was used to stop bleeding, heal ulcers and wounds, and treat tuberculosis and kidney problems.
Read more about this topic: List Of Plants Used In Herbalism