Homeopathy, now two centuries old, proceeds from a fascinatingly bizarre premise; that there is a u-shaped curve for dose. Reasonable people know the dose makes the poison; a medicine that can help you at normal levels can be harmful at high levels. 

Homepaths (and the Endocrine Disrupting Chemical community) instead also believe in an upward curve at other end, that chemicals at extremely low levels can also affect people. This u-shaped curve allows all manner of homeopathic "remedies" to be foisted off on people, not to mention allowing anti-science activists to attribute magical statistical harms to chemicals that science can't detect.

Under President Clinton's 1994 Dietary Supplement Health and Education Act (DSHEA), the U.S. Food and Drug Administration has to give homeopathy a free pass, as long as the label has a disclaimer that it is a homeopathic product, admitting it does nothing but act as a placebo, and doesn't actually do anything a medicine does.

Like this nonsense:

The only time FDA can crack down is when homeopathy actually contains a chemical at high enough levels to act as a drug or cause harm. And that is what they have done. Five companies who produce homeopathic products have gotten warning letters.  Kadesh Inc., U.S. Continental Marketing, Inc., Fill It Pack It, Inc., and Bershtel Enterprises LLC, doing business as WePackItAll, produce Puriton Eye Relief Drops, and during tests FDA found the eye drops were not sterile, which could lead to eye infections. You read that right, these people can't even bottle water correctly.

More worrisome is Newton Laboratories, whose homeopathic woo for children claims they are "natural" remedies but actually have natural toxic chemicals, like belladonna, aconitum napellus, gelsemium sempervirents, and nux vomica. Nux vomica contains strychnine - rat poison. 

These are outliers, of course. If you must buy a homeopathic product, do your best to research it first and make sure your placebo does nothing, like it is supposed to do.