Sometimes, but it depends on the herb—and “natural” is not the same as proven safe or effective. Herbal teas are infusions made from plants other than true tea (Camellia sinensis). According to MedlinePlus (U.S. National Library of Medicine / NIH), herbal medicines are dietary supplements; they are not held to the same testing standards as drugs, and some herbs can cause serious harm or interact with medicines.
Evidence for benefits varies widely by plant and preparation. Before using herbal teas for a health goal, check reliable sources and tell a health care provider what you are taking, especially if you use prescription or over-the-counter drugs.
Source: MedlinePlus — Herbal Medicine