Galactooligosaccharides
Best for
Ease constipation and stay regular
Proven strong benefit for 3–26 weeks · 3 studies , n=504
20 papers · 1 claim · 50 outcomes scored · 1 positive
Outcomes
What galactooligosaccharides actually does, by outcome
Each row is one outcome with effect size, evidence base, the dose that worked in trials, and time to first effect. Magnitude tiers come from native-unit MCID where available, Cohen's d otherwise.
| Outcome | Effect | Evidence | Dose | Weeks | Rank |
|---|---|---|---|---|---|
| Ease constipation and stay regular Proven strong benefit | | 3 RCTs n=504 | 0.5–2400 other | 3–26 wk | #2/18 |
Recommended Galactooligosaccharides products
Real products that dose Galactooligosaccharides where the research does, in a clean formulation, from brands we've audited. We only list ones we'd stand behind.
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Seeking Health
ProBiota Immune
Well dosed 1,100 mg/day A formulaBrand audit 85/100
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Jarrow Formulas
Jarro-Dophilus Baby
Well dosed 600 mg/day A formulaBrand audit 81/100
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Pure Encapsulations
Synbiotic GG
Well dosed 2,700 mg/day A formulaBrand audit 78/100
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Pure Encapsulations
Probiotic EasySticks
Well dosed 3 Gram(s)/day A formulaBrand audit 78/100
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Klaire Labs
Galactomune
Well dosed 1,100 mg/day A formula -
Just Thrive
Precision Prebiotic
Well dosed 2 Gram(s)/day A formula
Chosen for adequate Galactooligosaccharides dosing vs. the studied range, a clean formulation (grade A–C), and independent brand-quality audits. Not sponsored.
Sources
- 1. A Double-Blind Randomised Controlled Trial of Prebiotic Supplementation in Children with Autism: Effects on Parental Quality of Life, Child Behaviour, Gastrointestinal Symptoms, and the Microbiome. (2025) ↑
- 2. Growth and tolerance of infants fed formula supplemented with polydextrose (PDX) and/or galactooligosaccharides (GOS): double-blind, randomized, controlled trial. (2012) ↑
- 3. Prebiotic Galacto-Oligosaccharides Impact Stool Frequency and Fecal Microbiota in Self-Reported Constipated Adults: A Randomized Clinical Trial. (2022) ↑
- 4. Improving lactose digestion and symptoms of lactose intolerance with a novel galacto-oligosaccharide (RP-G28): a randomized, double-blind clinical trial. (2013) ↑
- 5. Indicators of improved emotion behavior in 6-14-year-old children following a 4-week placebo controlled prebiotic supplement intervention at home with a parent. (2025) ↑
- 6. Prebiotic intake reduces the waking cortisol response and alters emotional bias in healthy volunteers. (2015) ↑
- 7. Diet during pregnancy and infancy and risk of allergic or autoimmune disease: A systematic review and meta-analysis. (2018) ↑
- 8. A prebiotic intervention study in children with autism spectrum disorders (ASDs). (2018) ↑
- 9. Barcoded pyrosequencing reveals that consumption of galactooligosaccharides results in a highly specific bifidogenic response in humans. (2011) ↑
- 10. Prebiotic effect during the first year of life in healthy infants fed formula containing GOS as the only prebiotic: a multicentre, randomised, double-blind and placebo-controlled trial. (2015) ↑
Generated August 14, 2026