What This 2025 Chaga Supplement Authentication Study Actually Found

What the researchers found

Authentic chaga canker maintained a low-alpha, moderate-beta glucan pattern, while myceliated grain products flipped to high alpha-glucans that tracked cereal starch content.

Lugol staining and alpha-amylase digestion showed that the purple signal in myceliated grain products was starch-driven rather than a marker of authentic chaga chemistry.

Melanin-rich dark canker materials separated cleanly from pale myceliated grain products on alkaline extraction and UV-Vis absorbance.

Authentic canker contained inotodiol, trametenolic acid, lanosterol, osmundacetone, and syringic acid, whereas the myceliated grain products did not reproduce that marker set.

NMR and LC-QToF-MS showed that the canker extract stayed close to authentic chaga canker and that the myceliated grain products still looked chemically like their cereal substrates.

This is a strong product-authentication paper, not a health-effects paper. Across glucans, starch, melanin, triterpenoids, NMR, and LC-MS, authentic chaga canker and the one retail canker extract grouped together while the myceliated grain products mostly tracked their cereal substrates instead.

Why it matters

This paper is closest to the 2017 reishi supplement audit in its market-authentication logic, while the 2020 wild-mushroom beta-glucan paper is more useful as context for assay behavior than for finished-product identity. This is a strong product-authentication paper, not a health-effects paper. Across glucans, starch, melanin, triterpenoids, NMR, and LC-MS, authentic chaga canker and the one retail canker extract grouped together while the myceliated grain products mostly tracked their cereal substrates instead.

In the RethinkMushrooms taxonomy, this study sits closest to Chemistry Compound Analysis. Evidence level: analytical method / supplement quality evidence. This paper audits chemistry and product identity, not immune outcomes, cancer outcomes, or any other human endpoint.

The numbers in context

Retail products audited: 5 products. One retail canker extract and four myceliated grain products made up the commercial sample.

Reference materials: 12 materials. The retail products were benchmarked against six wild chaga vouchers, three pure mycelium controls, and three grain controls.

Authentic chaga beta-glucans: 5.7-11.9 %. This was the beta-glucan range across the six wild chaga voucher samples.

Authentic chaga alpha-glucans: 0.8-1.1 %. Authentic chaga canker stayed low in alpha-glucans, which helps separate it from grain-heavy products.

Myceliated-grain alpha-glucans: 33.1-68.4 %. The commercial myceliated grain products tracked a starch-heavy grain pattern rather than an authentic canker pattern.

Authentic melanin absorbance range: 0.4768-0.7685. Whole chaga canker and the retail canker extract produced the high absorbance values associated with melanin-rich authentic material.

Low melanin absorbance range: 0.0179-0.0492. Pure mycelium and myceliated grain products stayed near trace absorbance values after alkaline extraction.

Mean inotodiol content: 0.19 % w/w. Inotodiol was the most abundant quantified triterpenoid across the six wild chaga cankers.

Chaga-only LC-QToF-MS entities: 11 entities. Untargeted LC-QToF-MS identified eleven molecular entities exclusive to the authentic canker materials and the canker extract.

How the study worked

Study design: Cross-sectional laboratory comparison of retail chaga products and reference materials using glucan assays, Lugol starch staining, UV-Vis and FTIR melanin analysis, HPTLC, LC-ELSD or UV or DAD chromatography, proton NMR, and LC-QToF-MS metabolomics.. The authors compared five commercial chaga-labeled products - one retail 1:1 chaga canker extract and four myceliated grain products - against six wild chaga canker vouchers from China, Alaska, Canada, and Finland, three pure Inonotus obliquus mycelium preparations, and three cooked grain substrate controls. Intervention: Five commercial chaga-labeled products were profiled with a multi-assay authentication workflow that included glucan assays, iodine starch staining, melanin work, HPTLC, LC chromatography, NMR, and LC-QToF-MS.. Comparator: Commercial myceliated grain products and one retail canker extract were compared against six wild chaga vouchers, pure Inonotus obliquus mycelium controls, and cooked grain substrates.. Duration: Single cross-sectional laboratory comparison; two liquid-culture mycelium controls were grown for 3 weeks before harvest..

Main outcomes included alpha- and beta-glucan pattern differences between authentic chaga canker and myceliated grain products, starch presence by Lugol staining before and after alpha-amylase digestion, melanin-associated absorbance differences at 500 nm, triterpenoid and phenolic marker detection in authentic chaga versus myceliated grain products, metabolomic separation of authentic canker, pure mycelium, and myceliated grain products, ergosterol signal intensity as a fungal biomass proxy, unique LC-QToF-MS entities exclusive to authentic chaga materials. Analysis population: The paper's core retail comparison is small - five commercial products - but the control structure is richer than a simple market audit because it includes multiple authenticated and mechanistic comparators.. Dropouts: Not applicable because no human or animal subjects were enrolled.. This paper is strongest when read as a chemistry and authenticity workflow. It is much weaker as a statement about category-wide prevalence or about downstream clinical value.

Who was studied

Five commercial chaga-labeled products benchmarked against six wild canker vouchers, three pure mycelium controls, and three cooked grain controls.

What this study cannot tell us

Only five commercial products were audited, so the paper is a targeted market snapshot rather than a census of the broader supplement category.

Several assays used representative voucher samples after the authors judged the six wild canker vouchers broadly comparable, which reduces full-sample visibility for every assay layer.

Some methods, especially Lugol staining and HPTLC fingerprinting, still rely on qualitative or semiquantitative pattern interpretation.

The authors were not independent of the product-quality question: five authors worked for Nammex and one worked for a lab frequently employed by Nammex.

This study addresses authenticity and composition, not contaminants, stability over time, regulatory compliance across lots, or human clinical effects.

How to read the evidence

Useful full-text-reviewed authentication paper with a strong assay stack and weak independence.

When this study was published

Published 1 year ago in 2025. This is recent evidence, but replication still matters.

The bigger picture

2017: A multi-assay supplement audit had already exposed starch-heavy authenticity gaps in reishi products The discussion explicitly cites the 2017 Ganoderma lucidum audit as a precedent for using starch and secondary-metabolite markers to separate authentic mushroom material from poorly matching supplements.

2021: Prior chaga polysaccharide work had already shown that cultivated mycelium and sterile conk are not interchangeable materials The paper cites earlier structural polysaccharide work comparing cultivated Inonotus obliquus mycelium with sterile conk fractions, which set up the idea that material class matters before commercial authentication questions are even asked.

2023: Authentication work on chaga lipids had already separated chaga from mycelial analogs on another chemistry axis The discussion uses prior lipid-authentication research to show that the canker-versus-mycelial split is not limited to one assay family, and the current paper broadens that logic into a larger multi-marker workflow.

2025: This paper integrated glucans, melanin, triterpenoids, NMR, and LC-MS into one commercial-authentication workflow The main advance here is not a new health claim for chaga. It is the combination of multiple orthogonal markers that all push in the same direction when authentic canker is compared with myceliated grain products.

Replication

2017: A multi-assay supplement audit had already exposed starch-heavy authenticity gaps in reishi products 2021: Prior chaga polysaccharide work had already shown that cultivated mycelium and sterile conk are not interchangeable materials 2023: Authentication work on chaga lipids had already separated chaga from mycelial analogs on another chemistry axis 2025: This paper integrated glucans, melanin, triterpenoids, NMR, and LC-MS into one commercial-authentication workflow

Funding

The paper states that the research received no external funding.

Conflicts of interest

Most authors were employed by Nammex and report a financial interest in authentic chaga supplement sales; the remaining coauthor worked for Purity-IQ, a laboratory frequently employed by Nammex.

Questions still open

• Do the observed effects persist beyond single cross-sectional laboratory comparison; two liquid-culture mycelium controls were grown for 3 weeks before harvest.?
• Do not use this paper to claim that authentic chaga canker improves health outcomes in people?

Common questions

Read the original research

Comparative Study of Chaga (Inonotus obliquus) Dietary Supplements Using Complementary Analytical Techniques.

International journal of molecular sciences, 26(7)

Citation

Windsor, Coleton; Kreynes, Anna E; Chilton, Jeff S; Chioffi, William A; Krishnamurthy, Arun; Ishii, Melissa. (2025). Comparative Study of Chaga (Inonotus obliquus) Dietary Supplements Using Complementary Analytical Techniques.. International journal of molecular sciences, 26(7). https://doi.org/10.3390/ijms26072970