Each makers' focus will differ from any other's, and that is part of why an essence made from the same species of flower will not have the same action from one company to another. This is also why some company's essences differ in effectiveness from one person to another, as the vibration of any certain maker will be more or less in harmony with a particular user's needs. In the US, the Bach Remedies are sold in most health food stores, and a few other companies' offerings might be there as well. Most others do business by mail order. This site contains listings of some of the newer essence companies.
Essences work very well with other forms of healthcare.
Psychotherapists, energy workers, massage therapists, hypnotherapists, astrologers, acupuncturists, homeopaths, chiropractors, and medical doctors are finding essences nicely compliment their work. There are not many schools which teach about all types of essences. Often, they focus on only one essence company's work, offering a regrettably single-minded view of the field. For those who would like the widest perspective, we recommend referring to books, magazines, and the Internet for additional information. This site contains numerous articles and resources about all types and uses of essences, including a reading list .