Strong evidenceherb
Reishi for Frequent Colds
Beta-glucan polysaccharides potentiate immune function and enhance NK cell activity against pathogens.
How strong is the research?
Strong evidence
Based on a meta-analysis of multiple studies — the highest level of research evidence.
Research source
SourceBao X et al. · J Ethnopharmacol 2001How much to take
1000–1500 mg
Prophylactic immune support. Beta-glucan content varies by extraction method.