Side-effects
Conventional treatments are subjected to testing for undesired side-effects, whereas alternative treatments generally are not subjected to such testing at all. However, any treatment — whether conventional or alternative — that has a biological or psychological impact on a patient may also have potentially dangerous biological or psychological side-effects. Nevertheless, attempts to refute this fact with regard to alternative treatments sometimes use the appeal to nature fallacy, i.e. "that which is natural cannot be harmful".
Homeopathy, however, is insulated from direct side effects by the known laws of chemistry and physics. Homeopathic preparations, termed "remedies," are extremely dilute, often far beyond the point where a single molecule of the original active ingredient is likely to remain.
source:wikipedia
