Serum beta-glucan concentration after oral dosing: molecular mechanisms & dependencies

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What it does

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What acts on it

Maximum plasma concentrations for glucan phosphate occurred at 4 hours while laminarin and scleroglucan showed two plasma peaks between 0.5 and 12 hours, at 24 hours 27 plus or minus 3% of the glucan phosphate and 20 plus or minus 7% of the laminarin remained in the serum, following oral administration glucans were bound and internalized by intestinal epithelial cells and gut-associated lymphoid tissue cells with internalization by intestinal epithelial cells not being Dectin-dependent, gut-associated lymphoid tissue expression of Dectin-1 and Toll-like receptor 2 but not Toll-like receptor 4 increased, oral glucan increased systemic levels of interleukin-12 by 151%, and oral glucan administration also increased survival in mice challenged with Staphylococcus aureus or Candida albicans.
Glucan phosphate → Serum beta-glucan concentration after oral dosing source_derived_draftungraded
Experimental context and source evidence
evidence_span
{"source_cache": "artifacts/glucan-research/15976018.abstract.txt", "locator": "Indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "19df013d426cc48180a1bc6bb1e1e359c1d8b1f923cc97be369f5ad9116c3b18", "start_char": 0, "end_char": 1617, "text_sha256": "19df013d426cc48180a1bc6bb1e1e359c1d8b1f923cc97be369f5ad9116c3b18"}
experimental_model
Oral pharmacokinetics of three water-soluble glucans in rats, with uptake, receptor expression and infectious challenge in mice
exposure
Glucan phosphate, laminarin and scleroglucan at 1 milligram per kilogram orally in rats, and 1 milligram orally in mice
limitations
Rodent pharmacokinetics and rodent challenge models. The reported figure for glucan phosphate at 24 hours is a percentage remaining in serum whose denominator the abstract does not state, so it is not read here as a fraction of the swallowed dose.
nutrient_topic
Beta-glucan research collection; topical membership is not evidence of a direct clinical effect, and each preparation is recorded as its own entity with no family link joining any pair. · Beta-glucan
organism
Rat and mouse
plain_language
In rodents the swallowed sugar does cross into the circulation, is taken up by the gut immune tissue, and leaves the animals better able to survive an infection.
primary_references
[bg-p15976018] Oral delivery and gastrointestinal absorption of soluble glucans stimulate increased resistance to infectious challenge. (2005). https://pubmed.ncbi.nlm.nih.gov/15976018/ DOI: 10.1124/jpet.105.085415
tissue_or_cell_type
Plasma, intestinal epithelium and gut-associated lymphoid tissue
Beta-glucan: a structural family rather than an agent, what decides whether a bound glucan actually signals, the complement route that a cereal and a yeast preparation share, and the unequal human evidence behind each (2026-09-22) · lines 372–383
AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Oral pharmacokinetics of three water-soluble glucans in rats, with uptake, receptor expression and infectious challenge in mice · source_derived_draft · unverified_draft
### bg-oral-glucan-does-reach-the-blood Maximum plasma concentrations for glucan phosphate occurred at 4 hours while laminarin and scleroglucan showed two plasma peaks between 0.5 and 12 hours, at 24 hours 27 plus or minus 3% of the glucan phosphate and 20 plus or minus 7% of the laminarin remained in the serum, following oral administration glucans were bound and internalized by intestinal epithelial cells and gut-associated lymphoid tissue cells with internalization by intestinal epithelial cells not being Dectin-dependent, gut-associated lymphoid tissue expression of Dectin-1 and Toll-like receptor 2 but not Toll-like receptor 4 increased, oral glucan increased systemic levels of interleukin-12 by 151%, and oral glucan administration also increased survival in mice challenged with Staphylococcus aureus or Candida albicans. Condition category: normal nutrient_topic: Beta-glucan research collection; topical membership is not evidence of a direct clinical effect, and each preparation is recorded as its own entity with no family link joining any pair. plain_language: In rodents the swallowed sugar does cross into the circulation, is taken up by the gut immune tissue, and leaves the animals better able to survive an infection. organism: Rat and mouse tissue_or_cell_type: Plasma, intestinal epithelium and gut-associated lymphoid tissue experimental_model: Oral pharmacokinetics of three water-soluble glucans in rats, with uptake, receptor expression and infectious challenge in mice limitations: Rodent pharmacokinetics and rodent challenge models. The reported figure for glucan phosphate at 24 hours is a percentage remaining in serum whose denominator the abstract does not state, so it is not read here as a fraction of the swallowed dose. exposure: Glucan phosphate, laminarin and scleroglucan at 1 milligram per kilogram orally in rats, and 1 milligram orally in mice evidence_span: {"source_cache": "artifacts/glucan-research/15976018.abstract.txt", "locator": "Indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "19df013d426cc48180a1bc6bb1e1e359c1d8b1f923cc97be369f5ad9116c3b18", "start_char": 0, "end_char": 1617, "text_sha256": "19df013d426cc48180a1bc6bb1e1e359c1d8b1f923cc97be369f5ad9116c3b18"} [bg-p15976018] Oral delivery and gastrointestinal absorption of soluble glucans stimulate increased resistance to infectious challenge. (2005). https://pubmed.ncbi.nlm.nih.gov/15976018/ DOI: 10.1124/jpet.105.085415
Complete structured claim and evidence

Where it participates (unsigned role)

In a randomised open-label intervention pilot study in 15 healthy male volunteers, subjects in the beta-glucan group ingested beta-glucan 1000 milligrams once daily for 7 days, beta-glucan was barely detectable in serum of volunteers at all time-points, and neither cytokine production nor microbicidal activity of leukocytes were affected by orally administered beta-glucan, so the present study does not support the use of oral beta-glucan to enhance innate immune responses in humans.
Beta-glucan → Ex vivo cytokine production by stimulated leukocytes source_derived_draftungraded
Experimental context and source evidence
evidence_span
{"source_cache": "artifacts/glucan-research/25268806.abstract.txt", "locator": "Indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "b5a583c465284aae8e7d3e6dd9996fafe3b6ef389c61ee2a54f066fb4701e51b", "start_char": 0, "end_char": 1307, "text_sha256": "b5a583c465284aae8e7d3e6dd9996fafe3b6ef389c61ee2a54f066fb4701e51b"}
experimental_model
Randomised open-label intervention pilot study in 15 healthy male volunteers
exposure
Oral beta-glucan 1000 milligrams once daily for 7 days against no treatment, with serial sampling
limitations
Ten treated and five control subjects, one product, one dose, seven days, and ex vivo readouts. A negative pilot of this size does not establish that all oral preparations are inactive.
nutrient_topic
Beta-glucan research collection; topical membership is not evidence of a direct clinical effect, and each preparation is recorded as its own entity with no family link joining any pair. · Beta-glucan
organism
Human
plain_language
Ten healthy men took a gram a day for a week; almost none of it showed up in the blood and nothing measurable changed.
primary_references
[bg-p25268806] The effects of orally administered Beta-glucan on innate immune responses in humans, a randomized open-label intervention pilot-study. (2014). https://pubmed.ncbi.nlm.nih.gov/25268806/ DOI: 10.1371/journal.pone.0108794
tissue_or_cell_type
Serum and peripheral leukocytes
Beta-glucan: a structural family rather than an agent, what decides whether a bound glucan actually signals, the complement route that a cereal and a yeast preparation share, and the unequal human evidence behind each (2026-09-22) · lines 385–396
AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Randomised open-label intervention pilot study in 15 healthy male volunteers · source_derived_draft · unverified_draft
### bg-in-people-nothing-was-detectable In a randomised open-label intervention pilot study in 15 healthy male volunteers, subjects in the beta-glucan group ingested beta-glucan 1000 milligrams once daily for 7 days, beta-glucan was barely detectable in serum of volunteers at all time-points, and neither cytokine production nor microbicidal activity of leukocytes were affected by orally administered beta-glucan, so the present study does not support the use of oral beta-glucan to enhance innate immune responses in humans. Condition category: normal nutrient_topic: Beta-glucan research collection; topical membership is not evidence of a direct clinical effect, and each preparation is recorded as its own entity with no family link joining any pair. plain_language: Ten healthy men took a gram a day for a week; almost none of it showed up in the blood and nothing measurable changed. organism: Human tissue_or_cell_type: Serum and peripheral leukocytes experimental_model: Randomised open-label intervention pilot study in 15 healthy male volunteers limitations: Ten treated and five control subjects, one product, one dose, seven days, and ex vivo readouts. A negative pilot of this size does not establish that all oral preparations are inactive. exposure: Oral beta-glucan 1000 milligrams once daily for 7 days against no treatment, with serial sampling evidence_span: {"source_cache": "artifacts/glucan-research/25268806.abstract.txt", "locator": "Indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "b5a583c465284aae8e7d3e6dd9996fafe3b6ef389c61ee2a54f066fb4701e51b", "start_char": 0, "end_char": 1307, "text_sha256": "b5a583c465284aae8e7d3e6dd9996fafe3b6ef389c61ee2a54f066fb4701e51b"} [bg-p25268806] The effects of orally administered Beta-glucan on innate immune responses in humans, a randomized open-label intervention pilot-study. (2014). https://pubmed.ncbi.nlm.nih.gov/25268806/ DOI: 10.1371/journal.pone.0108794
Complete structured claim and evidence

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Serum beta-glucan concentration after oral dosing