Chronic bad breath (halitosis) usually originates from oral bacteria, tongue coating, or gastrointestinal sources. Supplements target the underlying causes rather than masking symptoms.
- Probiotics — Streptococcus salivarius K12 (1 billion CFU/day): Best-studied oral probiotic. Modest evidence for halitosis reduction by crowding out odor-producing bacteria.
- Zinc (10–20 mg/day): Binds volatile sulfur compounds that cause bad breath.
- Chlorophyllin (100 mg/day): Traditional "internal deodorant." Limited but suggestive evidence.
- Parsley oil, peppermint oil (softgels): Short-term freshening; masks rather than cures.
- Digestive enzymes: May reduce breath issues from poor digestion.
- Products claiming to cure halitosis without dental evaluation
- Activated charcoal supplements (absorbs medications; unnecessary for halitosis)
- Megadose zinc (>40 mg chronic) depletes copper
Probiotic strain specificity, zinc form, third-party testing, and accurate labeling that persistent halitosis requires dental and possibly medical evaluation (could indicate gum disease, tonsil stones, GERD, or rare metabolic conditions).