Auricularia

Many names, one species

Mu Er (China, 木耳 — "tree ear", from the shape of the fruiting body resembling an ear growing on a tree trunk), Hei Mu Er (China, 黑木耳 — "black tree ear"), kikurage (Japan, 木耳 — phonetic reading of the Chinese characters), mok-i (Korea), Jew's ear, Wood ear, Jelly ear, Cloud ear, Black fungus, Wood fungus (English — "Judas's ear", from the medieval legend that Judas Iscariot hanged himself on an elder tree Sambucus nigra, on which this fungus most often grows), uszak bzowy (Poland, the official botanical name from the black elder, the main host), uszak gęstowłosy, ucho Judasza, judaszowe ucho (regionally). All these names refer to the same species complex: Auricularia auricula-judae (Bull.) Quél. — the historical European name, now used globally in phytotherapy. TAXONOMIC NOTE: in 2014, Auricularia heimuer was scientifically distinguished as a separate East Asian species (commercially cultivated in China), morphologically indistinguishable from European A. auricula-judae — in market practice both species are sold under the name "Auricularia auricula-judae" or "Auricularia". Auricularia is one of the few functional mushrooms with a documented European medical tradition: the English herbalist John Gerard in The Herball (1597) recommended a decoction of wood ear in milk or beer for sore throats and tonsil swelling. In the TCM tradition, Mu Er is a classic tonic of Blood (Xue) and Yin, described in Shen Nong Ben Cao Jing (2nd century BC – 2nd century AD).

Typical batch specification

Typical batch: total polysaccharides above 30% by Megazyme method + HPLC-RID monosaccharide analysis. AAP (acidic polysaccharide, ca. 160 kDa) [TBD: typical value]% by chromatographic fractionation with SEC-MALS verification. β-1,3/1,6-glucans [TBD: typical value]% by Megazyme K-YBGL method (EUROFINS laboratory). Monosaccharide ratio (mannose : glucose : glucuronic acid : xylose) [TBD: typical profile] as a marker of species authenticity. Uronic acid content (a key parameter for anticoagulant activity) [TBD: typical value]% by the m-hydroxydiphenyl method. Moisture ≤ 5%. Extraction ratio 10:1. Microbiology compliant with the European Pharmacopoeia (Ph.Eur.). Every batch comes with a full COA including test methodology. For partners requiring the highest precision, we offer species verification by DNA barcoding ITS1/ITS2 with the GenBank/UNITE database (distinguishing A. auricula-judae from A. heimuer, A. polytricha, A. cornea and other members of the genus).

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Mechanisms described in the literature

Research on Auricularia auricula-judae (several hundred peer-reviewed publications, mainly Chinese and Korean, in vitro and animal models; few human RCTs) focuses on three mechanistic directions. The first of them — anticoagulant activity — is the best-described mechanism at the molecular level in the entire Aloha Fungi portfolio, and it is what makes Auricularia the species requiring the greatest regulatory caution.

1. 01

   AAP and anticoagulant activity through antithrombin

   The best-described mechanism in the entire Aloha Fungi portfolio (a level of molecular detail comparable with Shiitake lentinan and Coriolus PSK). AAP (Auricularia auricula polysaccharide), an acidic polysaccharide with a glucuronoxylomannan structure and a mass of about 160 kDa, acts as an allosteric catalyst of antithrombin III (AT-III) — a plasma protein that naturally inhibits thrombin (Factor IIa) and other proteases of the coagulation cascade [Yoon et al. 2003, Thromb Res 112(3):151–158]. NOTE: the mechanism is SELECTIVE — AAP catalyses the inhibition of thrombin by AT-III, but does NOT catalyse the inhibition of Factor Xa by AT-III, nor does it act through heparin cofactor II. This significantly distinguishes AAP from mammalian heparin (which acts in two ways: antithrombin + Xa). Specific anticoagulant activity of purified AAP: 2 IU/mg. Essentiality of glucuronic acids: after reduction of the carboxyl groups, the anticoagulant activity completely disappears [Yoon 2003]. In 2020, Wang and Su [Molecules 25(3):710, PMC7036816] confirmed the synergistic anticoagulant activity of aAAP-1 through the endogenous and exogenous coagulation pathways. A later study by Liu et al. [2022, PMC9369961] in a model of carrageenan-induced thrombosis in mice confirmed the antithrombotic activity of AAP in vivo. Large clinical RCTs in humans with documented thrombosis or in thromboprophylaxis are not yet available.

2. 02

   Hypocholesterolaemia and effect on the lipid profile

   The second mechanism, with a documented history of clinical observations dating back to the 1970s. Hammerschmidt [1980] described the case of a doctor in whom incorporating regular consumption of Mu Er into the diet (Chinese cuisine in Stanford) led to a measurable reduction in platelet aggregation and cholesterol — a classic "discovery story" in the literature on functional mushrooms. Today the mechanism is explained in three ways: a) AAP and β-glucans as a soluble fibre fraction bind bile acids in the intestine, increasing their excretion and forcing the liver to synthesise new ones from plasma cholesterol (a mechanism shared with oat β-glucans), b) modification of the gut microbiota towards promoting bile acid deconjugation, c) direct effect on PPAR-α receptors in the liver. In animal models of hypercholesterolaemia, AAP consistently lowers total cholesterol, LDL and triglycerides without affecting HDL. Small open observations in humans suggest an analogous effect, but large clinical RCTs with a documented primary lipid endpoint are not yet available. The mechanism is completely different from statins (HMG-CoA reductase) and from Shiitake eritadenine (SAHH), which makes Auricularia potentially COMPLEMENTARY support in hypercholesterolaemia — note however: the anticoagulant effect ADDS UP with the hypocholesterolaemic effect, giving a risk profile different from single mechanisms.

3. 03

   Immunomodulation, antioxidation and hepatoprotection

   The third mechanism, the broadest but also the least specific. Auricularia β-1,3/1,6-glucans activate Dectin-1 and TLR4 receptors on dendritic cells and macrophages [Brown & Gordon 2003] — a mechanism shared by all functional mushrooms containing β-glucans. The AAP glucuronoxylomannan additionally binds to TLR4 [Solve Labs review]. Auricularia melanin (a black fungal pigment, analogous to Chaga but in smaller concentrations) scavenges free radicals in in vitro tests [Liu et al. 2019]. The AAP I-a fraction protects in an animal model of D-galactose-induced ageing against oxidative stress (increase in SOD and glutathione, decrease in malondialdehyde) [Zhang et al. 2011, Carbohydr Polym]. Additionally, Auricularia is being investigated in the context of skin repair support: Choi et al. [2019, Nat Prod Res] showed in HaCaT keratinocyte cells that the extract promotes procollagen biosynthesis. Other studies (Wu 2010) describe the effect of AAP on heart function in an animal model (left ventricular ejection fraction in older rats). All observations require confirmation in human clinical RCTs.

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Extract applications

The Auricularia extract works technologically across a wide range of formats — a particularly valuable distinguishing feature is culinary recognisability in European Asian cuisine (Auricularia is a common ingredient of Peking soup, hot and sour soup, hot pot, dim sum — this makes it the least exotic mushroom for the Polish consumer). Capsules, standard fill 300–500 mg of extract (typical protocols 500–2000 mg/day). Powder, in mixes with other functional mushrooms (classic combination with Reishi for support of night regeneration, or with Poria for mild drainage and tonification), in blends for Asian soups (authentic culinary positioning), in smoothies with ginger and turmeric. Auricularia has a mild, slightly earthy, almost neutral flavour — very easy to compose, similar to Poria and Tremella. Liquid extract (tincture), drops under the tongue for 30–60 seconds or into a drink. Chocolates and bars, flavour tolerance up to 3% by weight. Coffee and cacao, good flavour synergy (flavour neutrality). Functional beverages, Asian broths, RTD soups, mushroom coffees. "Cardiovascular wellness", "healthy aging", "blood support" supplements — NOTE: these claims in the EU require EFSA authorisation, section H. Beauty / skincare — Choi et al. [2019] described procollagen biosynthesis in HaCaT keratinocytes, so Auricularia may be considered for cosmetic applications (creams, sera), but requires an independent regulatory pathway (Cosmetic Regulation 1223/2009, CPNP).

Precautions

Auricularia is dietetically SAFE (common in Asian cuisine for over 1400 years, in Polish folk tradition for centuries as wood ear collected wild), BUT as a concentrated extract it REQUIRES THE GREATEST CAUTION in the risk group — it is the species with the STRONGEST documented haemodynamic profile in the Aloha Fungi portfolio. The list of contraindications and interactions is LONGER than for most mushrooms in the portfolio — a deliberate choice for consumer safety.

Absolute contraindications: blood coagulation disorders (haemophilia A and B, von Willebrand disease, thrombocytopenia with platelet count below 100×10⁹/L, other haemorrhagic diatheses). Status after recent haemorrhage (intracerebral, gastrointestinal, urinary tract) within the last 6 months. Active gastric or duodenal ulcer. Post-organ-transplant status with active immunosuppression (β-glucans activate Dectin-1 and TLR4). Children under 18 for concentrated extract. Known allergy to fungi of the Auriculariaceae family.

Requires consultation with a doctor: pregnancy and breastfeeding — no adequate RCTs, classical TCM cautious given the anticoagulant potential of Mu Er in pregnancy; we recommend discontinuation until breastfeeding ends. Autoimmune diseases in remission or active — mild immunomodulation through β-glucans. Liver disease (cirrhosis, active hepatitis) — most coagulation factors are synthesised in the liver; any liver function impairment plus anticoagulant supplementation requires monitoring. Orthostatic hypotension — Auricularia has mild hypotensive action (potentiating with hypotensive drugs). Inflammatory bowel diseases (Crohn's, ulcerative colitis) in the exacerbation phase with risk of bleeding. Kidney failure on dialysis — the haematology-of-kidneys context requires the attention of a nephrologist.

Possible adverse effects (rarely reported): minor bruising or easier bruising in the first weeks (a signal of slightly increased bleeding risk — an indication to reduce the dose or discontinue supplementation + consult a doctor). Minor gum or nose bleeding of greater intensity than usual. Gastrointestinal disorders (mild bloating, soft stool) in the first week from the prebiotic effect of β-glucans. Isolated allergic reactions. ANY bleeding requires immediate discontinuation of the product and medical consultation. As standard, we include the key warnings on the final product's consumer label; for Auricularia we consider the warning about anticoagulants and planned procedures ABSOLUTELY MANDATORY on the label, regardless of the final form of the product.