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CAM therapies include a wide variety of botanicals and nutritional products, such as dietary supplements, herbal supplements, and vitamins. Many of these "natural" products are considered to be safe because they are present in, or produced by, nature. However, that is not true in all cases. In addition, some may affect how well other medicines work in your body. For example, the herb St. John's wort, which some people use for depression, may cause certain anticancer drugs not to work as well as they should.
Alternative treatments, by contrast, are used in place of mainstream treatments. The most popular alternative cancer therapies include restrictive diets, mind-body interventions, bioelectromagnetics, nutritional supplements, and herbs. The popularity and prevalence of different treatments varies widely by region. Cancer Research UK warns that alternative treatments may interact with conventional treatment, may increase the side effects of medication, and can give people false hope.
This treatment involves a naturally occurring substance that is found in certain nuts and seeds. Amygdalin is found in apricot kernels, cherry pits, some apple seeds, and a special type of almond seed called “bitter almond.” (Regular almonds do not contain amygdalin.) The bitter almond was the best source for amygdalin, but the USDA ordered all bitter almond trees to be destroyed, supposedly because of a concern about cyanide poisoning. (Amygdalin contains cyanide.)
Amygdalin is a glycoside. It consists of a molecule that combined glucose with cyanide. As discussed earlier, cancer cells must have glucose to survive. Thus, when the molecule of amygdalin enters a cancer cell, the molecule breaks apart and releases the cyanide. The cyanide then kills the cancer cell. The cyanide is not released in a healthy normally functioning cell, because a cancer cell contains a special enzyme, which must be present to release the cyanide. Thus amygdalin is harmless to a normal cell.
Ground cinnamon is very safe, the volatile oils can however cause a skin rash. Small amounts of coumarin can be found in Cassia and other cinnamons, generally only large doses of this compound will cause blood-thinning and liver problems, but it's something to be aware of. Also if you're planning on having surgery you should stop the use of cinnamon at least one week before going in as it has a blood thinning effect. You should also take care to monitor your blood sugar to avoid an unsafe drop in blood pressure.
Digitalis lanata Digitalis or foxglove It came into use in treating cardiac disease in late 18th century England in spite of its high toxicity.a Its use has been almost entirely replaced by the pharmaceutical derivative Digoxin, which has a shorter half-life in the body, and whose toxicity is therefore more easily managed. Digoxin is used as an antiarrhythmic agent and inotrope.
On the other hand, pathological ketoacidosis is a consequence of other disease conditions such as poorly managed type one diabetes. In this case, the level of ketones will be in the range of 15 to 25 mM. These extremely high levels of ketones can be a serious health problem. The ketogenic diet does not produce this level of ketones. For a thorough discussion of the scientific literature related to the use of the ketogenic diet in cancer treatment I recommend the treatise on the subject by Dr. Thomas N. Seyfried, Cancer as a Metabolic Disease. 
Since herbs are food, there are generally no dangerous side effects of using them in there natural state. If they are herbal extracts, they are more potent then the raw herb and should be taken in smaller doses to get the desired effects. Some herbs have a cleansing and detoxifying effect on the body and can cause diarrhea and nausea if taken in large quantity. Don’t worry. It’s good to cleanse the body of toxins. Just start off slowly and you’ll get the best long term results.
Scientists don’t know for sure. Since chemotherapy and radiation kill cells that divide often, stem cells may be less vulnerable because they rarely divide. Some scientists believe cancer stem cells may have genetic mutations that make them resistant to damage from chemotherapy or radiation, or cancer stem cells may be able to repair DNA damage more rapidly than normal cells.