Galactooligosaccharides (GOS) are prebiotic fibers naturally found in human breast milk and dairy products, composed of short chains of galactose units that serve as fuel for beneficial gut bacteria such as Bifidobacteria and Lactobacilli. Research suggests that GOS supplementation may support digestive comfort, with several studies indicating potential benefits for individuals experiencing symptoms of irritable bowel syndrome, including reduced bloating and improved bowel regularity. Studies also point to a role in supporting immune function and enhancing the absorption of minerals like calcium and magnesium. Widely used in infant formulas to more closely mimic the prebiotic profile of breast milk, GOS is available as a standalone powder for broader use and is generally well tolerated across age groups, though individual responses can vary.
Compare this supplementResearch suggests that galactooligosaccharides (GOS) may support gut health by acting as a prebiotic fiber that selec...
View studies →Research suggests that galacto-oligosaccharides (GOS) may support immune function through several interconnected path...
View studies →Research suggests that galactooligosaccharides (GOS) play a meaningful role in IBS symptom management, though the pic...
View studies →Research suggests that GOS may support nutrient absorption through multiple mechanisms, including direct effects on i...
View studies →These are commonly referenced dosage ranges for this supplement. They are not medical recommendations. Always consult a healthcare provider before supplementing.
| Form | Dose range | Frequency | Studied for | Source |
|---|---|---|---|---|
| Powder | 2.5 g | Twice daily | general gut health maintenance | Split dosing regimen observed in several tolerability and microbiome studies to minimize gastrointestinal side effects |
| Powder | 2.5–5 g | Daily | gut health and microbiome modulation | Common in clinical trials examining prebiotic effects on gut microbiota composition |
| Powder | 5–10 g | Daily | IBS relief and bowel regularity | Used in RCTs targeting IBS symptoms and stool consistency improvements |
| Powder | 5–7.5 g | Daily | immune function support | Studied in clinical trials assessing immune markers and respiratory infection incidence |
| Powder | 3–5 g | Daily | mineral and nutrient absorption | Used in studies examining calcium and magnesium absorption enhancement via prebiotic fermentation |