After several dilutions, the initial substance is essentially washed out and cannot be detected chemically in the final product. That's very reasonable as it makes no sense whatsoever in light of present day science. But regardless of what our sciences tell us is impossible, in practice, the higher the dilution the stronger and longer lasting the effect. All homeopathic remedies are FDA approved drugs. They are manufacture d by several pharmacies in the US as well as abroad to strictly set standards and in compliance with FDA regulations.
Homeopaths assess which remedy is appropriate by conducting a very thorough interview.
When the remedy is correct, oftentimes the client will experience an improved sense of well being and the eventual resolution of disease symptoms. While these aggravations can be challenging, they are not permanent. The best way to deal with the aggravations is to stay in touch with the practitioner. Usually, the homeopath has seen similar situations and is able to guide the client through the difficult situation. Conditions amenable to homeopathic treatment include anything that does not involve destroyed tissue.