What is Bacillus mutabilis?

Bacillus mutabilis is a homeopathic remedy. It is made from a gut germ of the coliform group, so it is called a bowel nosode. It is sold as a single homeopathic drug, not as a blend.

The starting material is watered down again and again, with shaking at each step. At the common 30C strength, none of the source material is left in the pill. Trials do not show any effect beyond a dummy pill.

Homeopaths have used it since the 1920s, mostly for long-running skin and bowel complaints. That is a record of custom, not of proof. Traditional use does not show that a remedy works.

How does Bacillus mutabilis work?

No one has shown how it could work in the body, because nothing of the germ is left to act.

Homeopaths say that the water and shaking leave an imprint of the starting material. Chemistry and physics give no support for that idea. It is a belief inside the tradition, not a tested fact.

Any relief people report is best explained by time, by care and attention, and by the placebo effect (feeling better after a dummy treatment).

What forms does Bacillus mutabilis come in?

It comes in a few simple forms.

Small round sugar pills, usually made of lactose (milk sugar) or sucrose, are the most common. Liquid drops in a water and alcohol mix are also sold. Some brands make a soft tablet that melts on the tongue.

Strengths are written as 30C, 200C or 1M. A higher number means more dilution steps, not a stronger dose.

Where it comes from:

The bowel nosodes came out of British homeopathy in the 1920s and 1930s.

Edward Bach, and later John Paterson and Elizabeth Paterson, grew gut germs from stool samples. They matched groups of germs to homeopathic remedies and made diluted preparations from them.

Bacillus mutabilis was one of the smaller members of that set. It has stayed a niche remedy used by some homeopaths, and it has no standing outside homeopathy.

What does Bacillus mutabilis help with?

• Long-running eczema and other dry, itchy skin: This is the use homeopaths name most often. It rests on old case notes from the 1930s, not on trials. There is no study in people that tests this remedy for eczema.
• Repeat bouts of loose stools or bloating: Bowel nosodes were built around gut germs, so gut complaints are a natural fit in the tradition. No human trial has tested it for this. Ongoing changes in your bowel habit need a doctor, not a remedy.
• Hay fever type sneezing and itchy eyes: Some homeopaths use it when hay fever runs alongside skin trouble. Evidence here is limited to case reports written by homeopaths. Proven treatments for hay fever are cheap and easy to get.
• Wheezy chests in children (traditional claim only): Older homeopathic texts list this use. There are no trials at all. Never use it in place of an inhaler, and never delay care for a child who is struggling to breathe.
• Feeling run down after repeat infections: In the tradition it is given as a slow-acting background remedy. No study supports this. Ongoing tiredness has many real causes worth checking.

Which foods are rich in Bacillus mutabilis?

This is a made-up homeopathic preparation. It is not found in any food.

What are the side effects of Bacillus mutabilis?

• No direct effects in most people, since no active dose remains
• Stomach upset in people who cannot handle lactose (milk sugar) pills
• Mouth or throat sting from the alcohol in liquid drops
• A short flare of your old symptoms, which homeopaths call an aggravation
• Delay in getting a proven treatment, which is the main real harm

Good to know:

Direct harm is very unlikely. The pill itself is sugar, so it behaves like a sweet.

The flare that homeopaths call an aggravation has never been shown in trials. It may simply be the illness taking its own course.

The risk that matters is the one you cannot see. If you use this instead of care that works, a treatable problem can get worse while you wait.

How much Bacillus mutabilis should you take?

• Recommended daily: There is no proven dose, because there is no proven effect. In practice, homeopaths give one dose of 30C and then wait. A dose means two or three pills, or a few drops. Follow the label on the pack you buy.
• Best time of day: Any time of day. Homeopaths often suggest taking it away from strong tastes such as coffee or mint.
• With or without food: Usually taken between meals, about fifteen minutes before or after food or drink. This is custom rather than a tested rule.
• Time to effect: No reliable time can be given. Any change people report usually comes over days or weeks, and it cannot be told apart from normal ups and downs.
• How long to take it: Bowel nosodes are traditionally given rarely, often no more than once a month. If nothing has changed after a few weeks, stop and think again. Do not let a trial run on for months while a real problem goes unchecked.