§ Claim under review · Mixed
"Milk" products made using dairy proteins from genetically engineered fungus (via precision fermentation) are now being commercially sold in the U.S. (On-image text: "WATCH YOUR LABELS! 'MILK' MADE BY GENETICALLY ENGINEERED FUNGUS IS NOW BEING SOLD IN THE U.S.")
Verdict
Accurate
Confidence
HighSummary
This claim checks out. Dairy proteins made by genetically engineered fungi through precision fermentation really are sold in food products in the United States. FDA records show that in 2020 the agency raised no objections to Perfect Day's beta-lactoglobulin, a cow milk protein produced by a genetically engineered strain of the fungus Trichoderma reesei, and that protein has since appeared in milk-style beverages, ice cream, cream cheese, and protein powders. The post's reference to a 2026 study is also real: a paper in Scientific Reports analyzed one such product and reported 236 fungal proteins and 93 compounds it could not chemically identify. That study describes what is in the product, but it did not test for toxicity and did not show that anyone was harmed, so it should not be read as evidence of a proven health risk. Two smaller framing issues: the product category is not new, since it has been on US shelves since roughly 2020 to 2022, and the image headline suggests a fungus-based drink when the fungus is actually a production host that is filtered out. The post's own caption acknowledges several of these limits, which is more careful than most viral content on this topic.
The readings
key figures from the evidencefungal proteins detected in synbio milk by shotgun proteomics
uncharacterized low molecular weight compounds in synbio milk
fungal protein share of total protein in tested product
Why this verdict
Evidence
The core factual claim is supported by primary regulatory and commercial evidence.
Perfect Day, Inc. filed GRAS Notice 863 with FDA for non-animal whey protein, specifically beta-lactoglobulin, "from fermentation by Trichoderma reesei," intended "as a substitute for dairy and plant derived proteins in foods that currently use protein from milk or plants." Trichoderma reesei is a filamentous fungus, and the strain is genetically engineered to carry the bovine beta-lactoglobulin gene. FDA records indicate GRN 863 received a "no questions" letter, while a later notice (GRN 1005) was withdrawn by its notifier and GRN 1056 was pending at the time of that document.
Commercial products containing this protein have been on the US market for years. Perfect Day's protein was used in Bored Cow flavored "animal-free dairy milk" launched by Tomorrow Farms in 2022, which later reached Target stores nationwide, and in ice cream, cream cheese, candy bars, cake mix, and the Myprotein "Whey Forward" protein powder line. A peer-reviewed review notes Perfect Day's recombinant beta-lactoglobulin produced via fungal fermentation with T. reesei is used in ice cream products. Industry analysis indicates that between 2019 and 2024, Perfect Day, Remilk, and New Culture each obtained US clearance for fermentation-derived milk proteins, with New Culture self-affirming GRAS in 2024 for fermentation-derived casein for mozzarella.
The post's secondary claim about "a 2026 study" also checks out as to existence. Velamuri, Yertha and Fagan published in Scientific Reports (2026, vol 16, article 16029) a multi-omics analysis of one commercially available "synbio milk" containing recombinant bovine beta-lactoglobulin made in T. reesei. Reported findings: 236 fungal proteins detected by shotgun proteomics, 93 low molecular weight compounds whose identities could not be matched in large mass spectral databases, and a nutritional profile differing from bovine milk, with only about 7 of 69 low molecular weight compounds found in cow's milk also present, at lower levels. The authors state that by three independent methods the product contained predominantly fungal protein rather than the 90 to 99 percent beta-lactoglobulin claimed by the developer. Secondary coverage reports fungal proteins at roughly 75 to 95 percent of total protein depending on method, with 87 of the 236 proteins present at relevant levels.
Findings
✓ What's accurate 5
- Dairy proteins are in fact produced by genetically engineered fungi (Trichoderma reesei) via precision fermentation. Confirmed in FDA's own GRAS notice record.
- Products containing these proteins are commercially sold in the United States, including milk-style beverages, ice cream, cream cheese, and protein powders. Confirmed by company, trade press, and peer-reviewed review sources.
- The caption's clarification that the product is not "a carton full of fungus" and that microbes act as production hosts is an accurate description of precision fermentation.
- A 2026 peer-reviewed study in Scientific Reports did examine one synbio milk product and reported 236 fungal proteins and 93 uncharacterized compounds.
- The caption's own hedge, that the findings "should not automatically be generalized to every precision-fermented dairy product," is a correct and unusually responsible qualifier.
≈ What's misleading 4
- Temporal framing. The on-image text "IS NOW BEING SOLD" implies a new or recent development. FDA cleared the Perfect Day notice in 2020 and retail products appeared from 2020 to 2022 onward. This is a five-plus year old market presence, not news. Distortion type: temporal framing, minor.
- Headline wording. "MILK MADE BY GENETICALLY ENGINEERED FUNGUS" reads, in isolation, as if the beverage is a fungal product. The caption corrects this, but the image is the part that travels on social media. Distortion type: omitted qualifier at the point of highest visibility.
- Implied alarm by juxtaposition. Pairing "WATCH YOUR LABELS" with a safety-flavored study reference invites readers to infer an established health risk. The cited study characterizes composition and explicitly calls for further safety testing. It does not report harm, illness, or toxicity. Distortion type: exaggeration of certainty by framing.
- "Watch your labels" implies these ingredients are easily identifiable on packaging. Labeling of fermentation-derived proteins is contested, and the caption itself concedes labeling questions are unsettled, which partly undercuts the instruction. Background knowledge, not verified in this investigation: USDA bioengineered food disclosure rules can exempt highly refined ingredients with no detectable modified genetic material. I could not verify the current disclosure status for these specific proteins and am flagging this as unconfirmed.
? What's uncertain 5
- Which specific fluid "milk" beverages are on US shelves as of the post date. Bored Cow's retail distribution is documented for 2022 to 2023, but I could not confirm its current availability in 2026. Protein powder, ice cream, and cheese applications are more clearly ongoing.
- The identity of the exact product tested in the 2026 study. Coverage refers to it as a commercially available synbio milk without consistently naming brand and manufacturer in the sources retrieved.
- Whether the study's findings have been replicated, contested, or responded to by the manufacturer or FDA. No rebuttal was located, but search was limited.
- Whether fungal protein carryover at the reported levels is specific to the one tested lot and product, or typical of the ingredient category.
- Current labeling and disclosure requirements for precision-fermented dairy proteins in the US.
Sources
10 of 10 linked to recordsFDA GRAS Notice Inventory, GRN No. 863, "β-lactoglobulin produced by Trichoderma reesei," notifier Perfect Day, Inc.
GRAS Notice (GRN) No. 863 full filing, Keller and Heckman LLP on behalf of Perfect Day
Velamuri R, Yertha T, Fagan J. "Multi-omics profiling finds synbio milk differs nutritionally from bovine milk and contains 93 uncharacterized fungal metabolites and 236 fungal proteins." Scientific Reports, volume 16, article 16029 (2026)
FDA GRAS notice file referencing Imagindairy beta-lactoglobulin, citing GRN 863, 1005, 1056 status
Perfect Day newsroom: Bored Cow animal-free dairy milk launch with Tomorrow Farms
Food Dive, "Perfect Day proteins power animal-free Bored Cow flavored milk"
Green Queen, Bored Cow animal-free milks in Target stores nationwide
Biosafe industry analysis on US versus EU approvals for Perfect Day, Remilk, New Culture
ScienceDirect review on precision fermentation protein production
GMWatch and Non-GMO Project write-ups of the HRI findings