Genuine alternatives are comparable methods that have met science-based criteria for safety and effectiveness. Experimental alternatives are unproven but have a plausible rationale and are undergoing responsible investigation.
Questionable alternatives are groundless and lack a scientifically plausible rationale.
Some methods fit into more than one category, depending on the claims made for them. There is no alternative medicine. There is only scientifically proven, evidence-based medicine supported by solid data or unproven medicine, for which scientific evidence is lacking. When someone feels better after having used a product or procedure, it is natural to credit whatever was done. This is unwise, however, because most ailments resolve by themselves and those that persist can have variable symptoms.