Low activity by the immune system: This claim asserts that if only the body's immune system were strong enough, it would kill the "invading" or "foreign" cancer. Unfortunately, most cancer cells retain normal cell characteristics, making them appear to the immune system to be a normal part of the body. Cancerous tumors also actively induce immune tolerance, which prevents the immune system from attacking them.[40]
Viburnum tinus Laurustinus V. tinus has medicinal properties. The active ingredients are viburnin (a substance or more probably a mixture of compounds) and tannins. Tannins can cause stomach upset. The leaves when infused have antipyretic properties. The fruits have been used as purgatives against constipation. The tincture has been used lately in herbal medicine as a remedy for depression. The plant also contains iridoid glucosides.[192]
Kava has been used by the people of the Pacific islands for hundreds of years as a natural anti-anxiety treatment. It has a very calming effect and puts most people in a good mood. It has also been used as a diuretic and to treat urinary problems, arthritis, asthma and upset stomach. It is very popular in Germany and often prescribed as the first line of treatment for anxiety disorders.

You don’t usually think of pineapple as a cough remedy, but that’s probably because you’ve never heard of bromelain. There’s evidence to suggest that bromelain — an enzyme found only in the stem and fruit of pineapples — can help suppress coughs as well as loosen the mucus in your throat. To enjoy the most benefits of pineapple and bromelain, eat a slice of pineapple or drink 3.5 ounces of fresh pineapple juice three times a day.

^ Valduga, Eunice; de Freitas, Renato João Sossela; Reissmann, Carlos B.; Nakashima, Tomoe (1997). "Caracterização química da folha de Ilex paraguariensis St. Hil. (erva-mate) e de outras espécies utilizadas na adulteração do mate". Boletim do Centro de Pesquisa de Processamento de Alimentos (in Portuguese). 15 (1): 25–36. doi:10.5380/cep.v15i1.14033. Archived from the original on 2014-08-26.
Eating a clove or two of fresh garlic a day may indeed keep the doctor away, in part because it has immune-boosting, antibacterial, antiviral, and anti-fungal effects. Many of garlic's therapeutic effects are derived from its sulfur-containing compounds, such as allicin, which are also what give it its characteristic smell. In general, garlic's benefits fall into four main categories: