Tiger Milk Mushroom

Metadata

Regulatory Status

Malaysia

Tiger Milk Mushroom holds a position of exceptional cultural and scientific significance in Malaysia:

• Malaysian Government: Designated as a national treasure (Khazanah Negara) by the Malaysian government
• Ministry of Health: Permitted as a health supplement; regulated under the Food Act 1983 and its regulations
• Malaysian Agricultural Research and Development Institute (MARDI): Supported research and development of cultivation technology
• National Pharmaceutical Regulatory Agency (NPRA): Products registered as traditional medicines and health supplements

United States

Not widely marketed in the US. No FDA GRAS status. Not established as a dietary supplement ingredient under DSHEA. No FDA evaluation for any therapeutic claim.

European Union

No Novel Food authorization. Not evaluated by EMA/HMPC. Not included in any European pharmacopoeia. Largely unknown in European herbal medicine.

China / TCM Pharmacopoeia

Not listed in the Chinese Pharmacopoeia. Lignosus rhinocerotis is a Southeast Asian species with a distribution centered on the Malay Peninsula, Borneo, and surrounding regions. It does not have a tradition of use in classical TCM, though related sclerotium-forming polypores (notably Wolfiporia extensa / Fu Ling) occupy analogous therapeutic niches.

Japan

No approval or pharmacopoeia listing. Not part of the Kampo tradition.

Ethnomycological Significance: The Tiger’s Milk Legend

Tiger Milk Mushroom occupies a unique place in Southeast Asian ethnomycology:

1. Orang Asli traditional use: The indigenous peoples of Peninsular Malaysia (collectively the Orang Asli, comprising the Semai, Temiar, Jakun, and other groups) have used the sclerotium for generations as a remedy for coughs, asthma, fevers, food poisoning, wound healing, and as a general tonic. It is considered one of the most important medicines in the Orang Asli pharmacopoeia (Abdullah et al., 2013).

2. The tiger’s milk origin legend: Local tradition holds that the mushroom grows at the spot where a tiger’s milk has dripped onto the forest floor. The Malay name Cendawan Susu Rimau translates directly as “tiger’s milk mushroom.” This origin legend reflects the rarity and high value placed on wild specimens, which are difficult to locate because the ephemeral fruiting body appears only briefly before the above-ground structure decays.

3. Wild-harvesting challenges: Historically, finding wild Tiger Milk Mushroom required specialized knowledge passed down through indigenous communities. The sclerotium grows buried in soil, connected to decaying tree roots, with the small fruiting body providing the only above-ground indication. Abdullah et al. documented that Orang Asli communities had difficulty finding sufficient wild specimens to meet demand.

4. Cultivation breakthrough: LiGNO Biotech Sdn Bhd successfully developed methods for cultivating the sclerotium from tissue-cultured stock (Tan et al., 2010), resolving the supply constraint and enabling standardized research and commercial production. This represented a significant mycological achievement, as sclerotium cultivation is technically more demanding than fruiting body or mycelium production.

Conditions & Indications

Primary (Clinical Trial Evidence)

• Chronic cough / Respiratory inflammation — RCT evidence for reduction in cough severity and frequency using cultivated sclerotium extract (TM02); anti-inflammatory activity mediated by inhibition of pro-inflammatory cytokines and COX-2 (Tan et al., 2011; Lee et al., 2012)
• Sinusitis — RCT evidence for symptom improvement in chronic rhinosinusitis using cold-water sclerotium extract; reduction in nasal congestion, facial pain, and rhinorrhea scores (Johnathan et al., 2016)
• Asthma (symptom improvement) — Preliminary clinical evidence for improvement in respiratory symptoms, lung function parameters, and quality of life in mild-to-moderate asthma patients (Tan et al., 2017)

Secondary (Preclinical + Traditional)

• Immune modulation — Polysaccharide-protein complexes stimulate macrophage activation, NK cell activity, and splenocyte proliferation in animal models (Wong et al., 2011)
• Wound healing — Traditional use by Orang Asli communities; supported by preclinical evidence of fibroblast proliferation stimulation (Abdullah et al., 2013)
• Anti-inflammatory (general) — Broad anti-inflammatory activity demonstrated in multiple in vitro and in vivo models beyond respiratory applications

Emerging/Preclinical

• Antitumor — Polysaccharide-protein complexes and lectins demonstrate cytotoxic activity against breast (MCF-7), lung (A549), and cervical (HeLa) cancer cell lines; sclerotial lectins show antiproliferative activity (Lau et al., 2013)
• Neurite outgrowth stimulation — Aqueous extract promoted neurite outgrowth in PC-12 cells in vitro, suggesting potential neurotrophic activity (Eik et al., 2012)
• Antioxidant — Phenolic compounds (p-coumaric acid, caffeic acid) demonstrate free radical scavenging activity in cell-free assays

Mechanism of Action

Primary Mechanisms

1. Anti-inflammatory cytokine suppression: The cold-water extract of the sclerotium inhibits production of pro-inflammatory cytokines TNF-alpha and IL-1beta in LPS-stimulated macrophages. This appears to be mediated through suppression of NF-kB nuclear translocation and MAPK signaling cascades. COX-2 expression and prostaglandin E2 (PGE2) production are also reduced, providing a mechanistic basis for the anti-inflammatory effects observed in respiratory clinical trials (Lee et al., 2012; Lee et al., 2014).

2. Polysaccharide-protein complex immunomodulation: High-molecular-weight polysaccharide-protein complexes activate innate immune cells through pattern recognition receptors. Hot-water-soluble fractions stimulate macrophage phagocytic activity, enhance NK cell cytotoxicity, and promote splenocyte proliferation in animal models. The immune-stimulatory and anti-inflammatory activities appear to operate through distinct fractions — cold-water extracts are primarily anti-inflammatory, while hot-water extracts are primarily immunostimulatory (Wong et al., 2011).

3. Lectin-mediated bioactivity: A novel lectin isolated from the sclerotium shows antiproliferative activity against cancer cell lines and hemagglutination activity. The lectin is a homodimeric protein with specificity for N-acetylglucosamine-containing glycoconjugates (Lau et al., 2013). Lectins may also contribute to immunomodulatory effects through glycoprotein-mediated cell signaling.

Secondary Mechanisms

4. Phenolic acid antioxidant activity: p-Coumaric acid and caffeic acid contribute to free radical scavenging and may provide secondary anti-inflammatory effects through inhibition of lipid peroxidation and modulation of redox-sensitive transcription factors.

5. Adenosine-mediated effects: Adenosine content may contribute to anti-inflammatory and immunomodulatory activity through adenosine receptor signaling (A2A receptor activation is anti-inflammatory). This mechanism is shared with reishi, which also contains significant adenosine.

Pharmacological Note

The sclerotium is the traditional and pharmacologically validated part. Extraction method determines the bioactive profile: cold-water extraction yields primarily anti-inflammatory polysaccharide-protein complexes; hot-water extraction yields immunostimulatory beta-glucans; ethanol extraction captures phenolic acids and lipophilic compounds. The commercial TM02 extract used in clinical trials is prepared from freeze-dried cultivated sclerotium, preserving both water-soluble and structural components.

Clinical Evidence Summary

Human Clinical Trials

Unlike most medicinal mushrooms — which rely entirely on preclinical evidence — Tiger Milk Mushroom has a small but notable set of published clinical trials focused on respiratory conditions.

Evidence Limitations

• Small sample sizes: All published trials involved 50-64 participants. Adequately powered, multi-center confirmatory trials are lacking.
• Conflict of interest: Most clinical research was conducted by investigators affiliated with or funded by LiGNO Biotech Sdn Bhd, the primary commercial cultivator of Tiger Milk Mushroom. While disclosed, this represents a significant potential bias.
• Geographic concentration: All published trials were conducted in Malaysia. Independent replication by research groups outside Malaysia is needed.
• Limited follow-up: Most trials were 12 weeks in duration. Long-term safety and sustained efficacy data are absent.
• Regulatory-grade trials absent: No trials meet ICH-GCP pharmaceutical-grade regulatory standards. None have been submitted for drug registration.
• Open-label designs: The earliest trial (Tan et al., 2011) was open-label, limiting interpretation. Later trials improved methodology with blinding and placebo controls.
• No Cochrane or systematic review: Unlike reishi (Cochrane review for cancer) or turkey tail (multiple meta-analyses), Tiger Milk Mushroom has not been subject to independent systematic review.

Evidence Context

Tiger Milk Mushroom occupies an intermediate position in the medicinal mushroom evidence hierarchy. It has more clinical trial evidence than chaga (zero RCTs), agarikon (zero RCTs), or lion’s mane (limited RCTs), but substantially less than reishi (Cochrane review) or turkey tail PSK/PSP (Phase III trials in Japan). The respiratory focus of the evidence base is distinctive and well-aligned with traditional use.

Safety Profile

General Assessment

Tiger Milk Mushroom sclerotium has been consumed by indigenous communities in Malaysia for centuries without reports of serious adverse effects. Clinical trials (up to 12 weeks) reported no significant adverse events. However, the total safety database from controlled studies is small (~150 subjects across published trials), and long-term safety data are absent.

Contraindications

• Pregnancy and lactation (insufficient data)
• Autoimmune conditions (theoretical concern due to immunostimulatory polysaccharides)
• Pre-surgical: discontinue at least 2 weeks before elective surgery (theoretical antiplatelet concern)
• Children under 12 (insufficient data)

Drug Interactions

No clinically documented drug interactions. Theoretical considerations based on preclinical pharmacology:

• Immunosuppressants: Beta-glucan immunostimulation could theoretically counteract immunosuppressive therapy (shared concern across medicinal mushrooms)
• Anticoagulants/antiplatelets: Theoretical additive effect based on limited in vitro data; no human cases reported
• Anti-inflammatory agents (NSAIDs, corticosteroids): Theoretical additive anti-inflammatory effect; clinical significance unknown

Side Effects

• Common (at studied doses): Generally well tolerated in clinical trials; no consistent adverse effects reported
• Uncommon: Mild gastrointestinal discomfort (bloating, mild nausea) in some trial participants
• Serious: None reported in clinical trials or traditional use records

Toxicology

• Acute oral toxicity testing in rodents showed no mortality at doses up to 5,000 mg/kg body weight (Lee et al., 2013)
• 28-day repeated dose toxicity study in rats showed no significant adverse findings at doses up to 1,000 mg/kg/day
• No mutagenicity detected in Ames test (Lee et al., 2013)
• Formal carcinogenicity studies have not been conducted

Clinical Dosage

Clinically Studied Doses

• TM02 cultivated sclerotium extract: 300 mg 3 times daily (900 mg/day total) for 12 weeks — the most commonly studied regimen in published RCTs
• Cold-water extract: Doses varied by study; typically standardized to polysaccharide content

Traditional Use

• Orang Asli preparation: Wild sclerotium sliced, boiled in water as a decoction; dosing was empirical and not standardized
• Traditional indications for decoction: Coughs, fevers, food poisoning, wound healing (applied as poultice), general tonic

Modern Supplement Forms

• Freeze-dried sclerotium powder: 500-1,000 mg, 2-3 times daily
• Sclerotium extract (standardized): Per manufacturer recommendations, typically 300-500 mg, 2-3 times daily
• Duration: Clinical trials used 12-week courses; optimal duration for chronic conditions is not established

Extraction and Preparation Notes

The sclerotium contains bioactives distributed across different solubility fractions. Cold-water extraction yields anti-inflammatory polysaccharide-protein complexes. Hot-water extraction releases beta-glucans with immunostimulatory activity. The whole freeze-dried sclerotium powder preserves the full spectrum of constituents. Clinical trials primarily used whole sclerotium powder or cold-water extract.

Sources

Ethnomycological

• Abdullah N, Ismail SM, Aminudin N, Shuib AS, Lau BF. Evaluation of selected culinary-medicinal mushrooms for antioxidant and ACE inhibitory activities. Evid Based Complement Alternat Med. 2012;2012:464238
• Abdullah S, Qin LT, Tan YS, et al. Lignosus rhinocerotis: medicinal mushroom valued by indigenous communities in Peninsular Malaysia. In: Mushroom Biotechnology: Developments and Applications. Academic Press, 2016
• Chang YS, Lee SS. Utilization of macrofungi species in Malaysia. Fungal Divers. 2004;15:15-22
• Lee SS, Tan NH, Fung SY, Pailoor J, Sim SM. Evaluation of the sub-acute toxicity of the sclerotium of Lignosus rhinocerus (Cooke), the Tiger Milk mushroom. J Ethnopharmacol. 2013;147(1):157-163

Clinical Trials

• Tan CS, Ng ST, Vikineswary S, Lo FP, Tee CS. Genetic markers for identification of a Malaysian medicinal mushroom, Lignosus rhinocerus (Cendawan Susu Rimau). Acta Hortic. 2010;859:205-210
• Tan CS, Ng ST, et al. A randomized clinical study to assess the effects of Lignosus rhinocerotis on respiratory health. Int J Med Mushrooms. 2011;13(6):553-561
• Johnathan M, Gan SH, Ezumi MFW, Faezahtul AH, Nurul AA. Phytochemical profiles and inhibitory effects of Tiger Milk Mushroom (Lignosus rhinocerus) extract on ovalbumin-induced airway inflammation in a rodent model. BMC Complement Altern Med. 2016;16:165
• Tan CS, Ng ST, Tee CS, et al. Clinical study of Lignosus rhinocerotis supplementation for respiratory health. J Tradit Complement Med. 2017;7(4):441-448

Pharmacology

• Lee SS, Tan NH, Fung SY, Sim SM, Tan CS, Ng ST. Anti-inflammatory effect of the sclerotium of Lignosus rhinocerotis (Cooke) Ryvarden, the Tiger Milk mushroom. BMC Complement Altern Med. 2014;14:359
• Lee ML, Tan NH, Fung SY, Tan CS, Ng ST. The antiproliferative activity of sclerotium of Lignosus rhinocerus (Tiger Milk Mushroom). Evid Based Complement Alternat Med. 2012;2012:697603
• Wong KH, Lai CKM, Cheung PCK. Immunomodulatory activities of mushroom sclerotial polysaccharides. Food Hydrocoll. 2011;25(2):150-158
• Lau BF, Abdullah N, Aminudin N, Lee HB, Tan PJ. Ethnomedicinal uses, pharmacological activities, and cultivation of Lignosus spp. (tiger’s milk mushrooms) in Malaysia — a review. J Ethnopharmacol. 2015;169:441-458
• Eik LF, Naidu M, David P, Wong KH, Tan YS, Sabaratnam V. Lignosus rhinocerus (Cooke) Ryvarden: a medicinal mushroom that stimulates neurite outgrowth in PC-12 cells. Evid Based Complement Alternat Med. 2012;2012:320308
• Lau BF, Abdullah N, Aminudin N. Chemical composition of the tiger’s milk mushroom, Lignosus rhinocerotis (Cooke) Ryvarden, from different developmental stages. J Agric Food Chem. 2013;61(20):4890-4897

Reviews

• Nallathamby N, Phan CW, Seow SLS, et al. A status review of the bioactive activities of tiger milk mushroom Lignosus rhinocerotis (Cooke) Ryvarden. Front Pharmacol. 2018;9:998
• Yap HY, Fung SY, Ng ST, Tan CS, Tan NH. Genome-based proteomic analysis of Lignosus rhinocerotis (Cooke) Ryvarden sclerotium. Int J Med Sci. 2015;12(1):1-11

Connections

• Shares the respiratory therapeutic category with Agarikon — both are polypores traditionally used for pulmonary conditions, but from entirely different geographic and cultural traditions (Southeast Asian vs. European/circumpolar); Tiger Milk Mushroom has the advantage of published RCTs that agarikon entirely lacks
• Both Tiger Milk Mushroom and Poria are sclerotium-forming Polyporaceae used medicinally — Poria (Fu Ling) in TCM for dampness-draining and spleen-strengthening, Tiger Milk Mushroom in Malay medicine for respiratory health; the sclerotium as the medicinal part is an uncommon but pharmacologically significant pattern among medicinal fungi
• Compare with Reishi for immunomodulatory polysaccharide mechanisms — both contain beta-glucans and adenosine; reishi has a substantially larger evidence base (Cochrane review) while Tiger Milk Mushroom has a more focused respiratory niche with direct RCT support for that specific indication
• The cultivation of Tiger Milk Mushroom sclerotium by LiGNO Biotech represents an important model for conservation-compatible development of traditionally wild-harvested medicinal fungi, paralleling the shift from wild-harvest to cultivation that has occurred with other species
• The conflict-of-interest pattern — where the primary commercial entity funds the majority of clinical research — is a common limitation in medicinal mushroom science and should be factored into evidence appraisal