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Homeopathy is a 'treatment' based on the use of highly diluted substances, which practitioners claim can cause the body to heal itself.
A 2010 House of Commons Science and Technology Committee report on homeopathy said that homeopathic remedies perform no better than placebos, and that the principles on which homeopathy is based are "scientifically implausible". This is also the view of the Chief Medical Officer, Professor Dame Sally Davies.
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Homeopathy is a complementary or alternative medicine (CAM). This means that homeopathy is different in important ways from treatments that are part of conventional Western medicine.
It is based on a series of ideas developed in the 1790s by a German doctor called Samuel Hahnemann.
A central principle of the "treatment" is that "like cures like" – that a substance that causes certain symptoms can also help to remove those symptoms. A second central principle is based around a process of dilution and shaking, called succussion.
Practitioners believe that the more a substance is diluted in this way, the greater its power to treat symptoms. Many homeopathic remedies consist of substances that have been diluted many times in water until there is none or almost none of the original substance left.
Homeopathy is used to "treat" an extremely wide range of conditions, including physical conditions such as asthma and psychological conditions such as depression (see When is it used?).
There has been extensive investigation of the effectiveness of homeopathy. There is no good-quality evidence that homeopathy is effective as a treatment for any health condition (see What can we conclude from the evidence?).
Homeopathy is not available on the NHS in all areas of the country. Two NHS hospitals provide homeopathy, and some GP practices also offer it.
Homeopathy is usually practised privately and homeopathic remedies are available from pharmacies. The price for an initial consultation with a homeopath can vary from around £20 to £80. Homeopathic tablets or other products usually cost around £4 to £10.
When you first see a homeopath they will usually ask you about any specific health conditions, but also about your general wellbeing, emotional state, lifestyle and diet.
Based on this, the homeopath will decide on the course of treatment, which most often takes the form of homeopathic remedies given as a pill, capsule or tincture.
Your homeopath may recommend that you attend one or more follow-up appointments so the effects of the remedy on your health can be assessed.
Homeopathy is used for an extremely wide range of health conditions. Many practitioners believe that homeopathy can help with any condition.
Among the most common conditions that people seek homeopathic treatment for are:
There is no good quality evidence that homeopathy is an effective treatment for these or any other health conditions.
Some practitioners also claim that homeopathy can prevent malaria or other diseases. There is no evidence to support this and no scientifically plausible way that homeopathy can prevent diseases.
The National Institute of Health and Care Excellence (NICE) advises the NHS on proper use of treatments. NICE currently does not recommend that homeopathy should be used in the treatment of any health condition.
There is no legal regulation of homeopathic practitioners in the UK. This means that anyone can practise as a homeopath, even if they have no qualifications or experience.
A number of professional associations can help you to find a homeopath who will practise the treatment in a way that is acceptable to you.
Homeopathic organisations in England include:
Voluntary regulation aims to protect patient safety, but it does not mean that there is scientific evidence that a treatment is effective.
Homeopathic remedies are generally safe and the risk of a serious adverse side effect arising from taking these remedies is thought to be small.
Some homeopathic remedies may contain substances that are not safe, or that interfere with the action of other medicines. You should talk to your GP before stopping any treatment prescribed by a doctor or avoiding procedures such as vaccination in favour of homeopathy.
There have been several reviews of the scientific evidence on the effectiveness of homeopathy. The House of Commons Science and Technology Committee said there is no evidence that homeopathy is effective as a treatment for any health condition.
There is no evidence for the idea that substances that can induce certain symptoms can also help to treat them. There is no evidence for the idea that diluting and shaking substances in water can turn those substances into medicines.
The ideas that underpin homeopathy are not accepted by mainstream science, and are not consistent with long-accepted principles on the way that the physical world works. The Committee's 2010 report on homeopathy said the "like cures like" principle is "theoretically weak", and that this is the "settled view of medical science".
It is of note, for example, that many homeopathic remedies are diluted to such an extent that there is unlikely to be a single molecule of the original substance remaining in the final remedy. In cases such as these, homeopathic remedies consist of nothing but water.
Some homeopaths believe that, due to the succussion process, the original substance leaves an "imprint" of itself on the water. But there is no known mechanism by which this can occur. The 2010 report said: "We consider the notion that ultra-dilutions can maintain an imprint of substances previously dissolved in them to be scientifically implausible."
Some people who use homeopathy may see an improvement in their health condition due to a phenomenon known as the placebo effect.
If you choose health treatments that provide only a placebo effect, you may miss out on other treatments that have been proven to be more effective. Read more about the placebo effect.
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