Quality Testing and Certificates of Analysis for Mushroom Products
What a certificate of analysis is, which tests exist for mushroom products, what each can show, and why a test result or seal is not a guarantee of safety or benefit.
Content last updated . This page has not been medically reviewed.
Safety first. Supplements can cause side effects and interact with medicines. Read mushroom safety and interactions before you use any mushroom product.
Many mushroom supplement websites mention "third-party testing" or offer a "certificate of analysis" (COA). This page explains, in plain terms, what those words describe in US rules, which kinds of tests researchers use on mushroom products, and what a result can and cannot tell you. It names no companies and ranks no products.
Information here is for general education. It is not medical advice.
What a certificate of analysis is
A COA is a document from a supplier or laboratory that reports test results for a batch of material. US rules for supplement makers (21 CFR 111.75) describe when a maker may rely on a supplier's COA for certain components. The maker must first qualify the supplier by confirming the reliability of the COA. [1] The rule says the COA must describe the test methods, the limits of the tests, and the actual results. [2]
The same rule says that, before use, a maker must run at least one appropriate test or examination to verify the identity of any component that is a dietary ingredient, unless FDA grants an exemption. [3] In other words, a COA from a supplier is allowed for some checks, but identity of the dietary ingredient is handled differently in the rule.
What this does not tell us: the rule describes what makers must do. It does not tell you whether a particular company did it. NCCIH notes that FDA says it can't test all products marketed as dietary supplements that may have potentially harmful hidden ingredients. [4] In the US, FDA can take action against adulterated or misbranded supplements only after the product is on the market. [5]
Which tests exist for mushroom products
| Question | Test type (as described in research) | What the source found | Strength of evidence |
|---|---|---|---|
| Is it the species on the label? | DNA barcoding of the ITS region | A study barcoded 33 fungal samples used as food or supplements, including powdered mycelium and capsules, and discussed barcoding for certification. [6] A separate study used ITS2 sequences to distinguish commercial Ganoderma lucidum and G. sinense products from other Ganoderma species. [7] | Method research, not a market survey |
| Is it fruiting body or grain? | Chemical fingerprints and an iodine-starch assay | In a chaga product study, starch was found in fermented grain products and not in authentic chaga canker. [8] | One study, one species |
| Is the beta-glucan number reliable? | Enzymatic assays | A 2026 paper says modern supplements with resistant starches, trehalose and maltitol challenge the usual indirect method. [9] | Methods paper |
| Is it clean of metals? | Mass spectrometry (ICP-MS) | See Heavy Metals, Pesticides and Mold. | Varies |
| Is it the right product for a high-value species? | Chemical and microscopic tests, thin-layer chromatography | A Thai survey of 65 online cordyceps products used these to find substitution; see Substitution and Mislabeling. [10] | One country, convenience sample |
A review of testing for botanical products sold for "immune health", which included functional mushrooms, describes chromatography, spectroscopy and DNA approaches for checking label claims. [11]
Questions a reader can ask a company
These are questions, not a checklist of what a "good" company says: Which species and which part? Which methods and limits are on the COA? Does the COA match the lot on my bottle? Who ran the test? If answers are vague, that is information too. For the label itself, see How to Read a Mushroom Supplement Label.
Frequently asked questions
What is a certificate of analysis for a mushroom supplement?
It is a document reporting test results for a batch. US rules describing when a maker may rely on a supplier's COA say it must include the methods, limits and actual results. [2]
Does a COA mean the product is safe?
No. It reports what was tested. A COA that lists only identity says nothing about metals, and neither says anything about how a product fits your medicines. NCCIH notes supplements may interact with medicines or pose risks around surgery. [13]
Is "third-party tested" regulated?
Proper evidence not found in the sources we read: we read US supplement rules (21 CFR 111.75) and NCCIH, which describe supplier COAs and the word "certified" but not a rule about the phrase "third-party tested". Ask what was tested and by whom.
Can DNA tests tell if a product is the right mushroom?
Researchers have shown DNA barcoding can help verify species in processed material, including powdered mycelium and capsules. [6] A separate study found it could tell commercial Ganoderma lucidum and G. sinense products from other Ganoderma species. [7]
Who checks mushroom supplements before sale?
In the US, FDA is not authorized to approve dietary supplements for safety and effectiveness before they are marketed. [14] See Are Mushroom Supplements Regulated?.
More details: evidence, limits and cautions
The details behind this page: cautions, limits of the evidence and where sources disagree. Open any note to read it.
Limits of testing
- A passing result covers what was tested. A heavy-metal result says nothing about species, and a species result says nothing about metals.
- Methods matter. The beta-glucan paper above shows that a number can depend on the method used. [9]
- Seals are not the same as a COA. "Standardized", "verified" and "certified" do not necessarily guarantee product quality or consistency, according to NCCIH. [12] See Quality Testing and Certifications and Third-Party Testing and Certifications: What They Show.
- Testing does not show benefit or safety for you. A clean, correctly named product can still interact with medicines. Ask a pharmacist; see How Interactions Work.
References
- Electronic Code of Federal Regulations, 21 CFR 111.75: What must you do to determine whether specifications are met? Read 2026-10-23.
- Electronic Code of Federal Regulations, 21 CFR 111.75: What must you do to determine whether specifications are met? Read 2026-10-23.
- Electronic Code of Federal Regulations, 21 CFR 111.75: What must you do to determine whether specifications are met? Read 2026-10-23.
- National Center for Complementary and Integrative Health, Using Dietary Supplements Wisely Read 2026-10-23.
- National Center for Complementary and Integrative Health, Using Dietary Supplements Wisely Read 2026-10-23.
- DNA barcoding for identification of consumer-relevant mushrooms: A partial solution for product certification? Food Chem 2017 Read 2026-10-23.
- Identification of commercial Ganoderma (Lingzhi) species by ITS2 sequences. Chin Med 2015 Read 2026-10-23.
- Comparative Study of Chaga (Inonotus obliquus) Dietary Supplements Using Complementary Analytical Techniques. Int J Mol Sci 2025 Read 2026-10-23.
- Advances in Enzymatic Measurement of β-Glucan in Mushrooms, Yeast, Algae, and Dietary Supplements. J AOAC Int 2026 Read 2026-10-23.
- Post-marketing surveillance of cordyceps products online: identifying falsified products and regulatory challenges. BMC Complement Med Ther 2026 Read 2026-10-23.
- Label compliance for ingredient verification: regulations, approaches, and trends for testing botanical products marketed for "immune health" in the United States. Crit Rev Food Sci Nutr 2024 Read 2026-10-23.
- National Center for Complementary and Integrative Health, Using Dietary Supplements Wisely Read 2026-10-23.
- National Center for Complementary and Integrative Health, Using Dietary Supplements Wisely Read 2026-10-23.
- U.S. Food and Drug Administration, Information for Consumers on Using Dietary Supplements Read 2026-10-23.