This invention relates to a non-toxic composition which bind acetaldehyde present in the stomach, intestine and/or colon. The composition comprises one or more acetaldehyde-binding compound(s) comprising one or more free sulphhydryl and/or amino groups. The compound(s) are mixed with a non-toxic carrier that effects sustained release of said compound(s) in the gastrointestinal tract. These compositions are of benefit in particular to patients having atrophic gastritis or achlorhydric or low acid stomach.