About Larch Arabinogalactan
A soluble fiber and prebiotic polysaccharide from larch tree bark (Larix). One pediatric RCT (Grube 2006, ~200 children, 1.5 g/day) showed modest reductions in cold episodes over 12 weeks. Prebiotic effects (SCFA production) demonstrated primarily in vitro and animal models — human prebiotic data is weak. ImmunEnhancer (Lonza) is a branded larch arabinogalactan extract. FDA GRAS status as a dietary fiber. Evidence is limited — immune claims rest on a small number of trials.
What Larch Arabinogalactan supports
- May reduce cold/flu incidence (limited RCT data)
- Prebiotic fiber that supports gut microbiota
How much Larch Arabinogalactan to take
The RDA prevents deficiency. The effective range is what clinical trials used to actually move the outcome.
Effective
1500–4500
mg
Studies use 1.5–4.5 g/day. One pediatric RCT (Grube 2006) used 1.5 g/day for URI prevention. Supplement doses below 1500 mg have no clinical support.
Clinical evidence
Limited clinical evidence. A few small RCTs for URI prevention; prebiotic effects demonstrated in small human studies — overall evidence base is limited
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