Small Intestinal Bacterial Overgrowth (SIBO) occurs when bacteria appear in the normally more sterile small intestine and begin to colonise. Hydrogen (H2) and methane (CH4) gasses are produced in the digestive system primarily only by the bacterial fermentation of carbohydrates (sugars, starches or vegetable fibres).

Studies have indicated that potentially up to 80% of patients with IBS may in fact have SIBO which this Hydrogen /Methane breath test can easily and non-invasively help determine. This test is recommended for those with stubborn digestive or histamine issues.


Methane (CH4)
Hydrogen (H2)