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This is a list of substances or materials generally considered discredited. A substance can be discredited in one of three ways: It was widely believed to exist at one time but no longer is. Such substances are often part of an obsolete scientific theory. It was once believed to have drastically different properties from those accepted now.
The IARC Monographs on which this list is based assess the hazard linked to the agents, they do not assess the cancer risk of the agents. [1] The list is up-to-date as of January 2024. [ 2 ]
However, according to the American Cancer Society, "there is no convincing scientific evidence that cassava or tapioca is effective in preventing or treating cancer". [65] Castor oil – an oil made from the seeds of the castor oil plant. The claim has been made that applying it to the skin can help cure cancer.
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The claim that applying minerals directly to the skin in the form of cosmetics has health benefits, however, has inspired some scientific controversy. [3] Historically some mineral additives have proven to be poisonous to the skin, such as lead. [4] and the mineral Bismuth that can cause a negative skin reaction. However the kinds of minerals ...
Use of old mineral names is also discontinued, for example when a name is no longer considered valid. Therefore, a list of recognised mineral species is never complete. Minerals are distinguished by various chemical and physical properties. Differences in chemical composition and crystal structure distinguish the various species.
There is no evidence that crystal healing has any greater effect upon the body than any other placebo. While the practice is popular, it fosters commercial demand for crystals, which can result in environmental damage and exploitative child labor to mine the crystals. [5]
The water is still popular today, but said property is no longer emphasized. Radioactive quackery is quackery that improperly promotes radioactivity as a therapy for illnesses. Unlike radiotherapy , which is the scientifically sound use of radiation for the destruction of cells (usually cancer cells), quackery pseudo-scientifically promotes ...