Sal Tree

Shorea robusta
Sal Tree (Shorea robusta), also known as Shala, is a majestic tree revered in Ayurveda for its resin, bark, and leaves. It is traditionally believed to balance Vata, Pitta, and Kapha doshas. This dominant species in South Asia's dry deciduous forests is prevalent for its claimed astringent and healing properties, often used for various traditional applications.
PLANT FAMILY
Dipterocarpaceae
PARTS USED
Resin, Bark, Leaves
AYURVEDIC ACTION
Vata ↓, Pitta ↓, Kapha ↓
ACTIVE COMPOUNDS
Shorea robusta (5-10%)

What is Sal Tree?

Sal tree, scientifically known as Shorea robusta, is a majestic deciduous tree belonging to the Dipterocarpaceae family, native to the Indian subcontinent. Characterized by its strong, durable timber and broad, leathery leaves, it is a dominant species in the dry deciduous forests of South Asia. The tree produces a resin known as sal dammar, which has various traditional uses.

Beyond its economic value, the Sal tree holds significant ecological and cultural importance, revered in various traditions and providing habitat for diverse wildlife.

Other Names of Sal Tree

  • Sal
  • Shala
  • Sarai
  • Dammar

Benefits of Sal Tree

Heading

<h3> Absolute Contraindications of Sal Tree (Shorea robusta) </h3> <h4>Known allergy / prior hypersensitivity to tree resins or wood resins (skin allergy) [In plain language: you already react to tree resins or get contact rashes]</h4> <ul> <li>🧴</li> <li>Recommendation: Do not use topical Sal resin, extracts, or unprocessed plant parts on skin if you have a history of allergic contact dermatitis to tree resins or hardwood dusts; consult a dermatologist before trying.</li> <li>Reasoning: Plant and wood resins (including resins in Dipterocarpaceae family) and hardwood dusts are established causes of occupational and contact allergic dermatitis; individuals with prior sensitivity risk recurrent or worse reactions on re-exposure to resins like sal/dammar.</li> <li>Scientific_Study_Title: Occupational allergic contact dermatitis caused by wood dusts.</li> <li>Scientific_Study_Authors: Kanerva L, Estlander T, Jolanki R. (authors as indexed in the PubMed entry)</li> <li>Scientific_Study_Link: https://pubmed.ncbi.nlm.nih.gov/11260236/</li> <li>Scientific_Study_Excerpt: <p>“Exposure to wood dusts may cause various skin and mucosal symptoms. Allergic dermatoses, caused by wood dusts, diagnosed at the Finnish Institute of Occupational Health during 1976-1999 are reported here… On patch testing, patients reacted to different wood dusts and wood gum resins. Occupational allergic dermatoses are mainly caused by the dusts of hardwoods, mostly due to Type IV allergy.”</p> </li> </ul> <h4>Severe prior anaphylactic reaction to plant resins or known severe atopy [In plain language: you have had life-threatening allergic reactions to plant resins]</h4> <ul> <li>🚨</li> <li>Recommendation: Avoid any ingestion or topical use of Sal products and seek specialist allergy testing before any trial; emergency plan (epi-pen, contact physician) is essential if exposed accidentally.</li> <li>Reasoning: While direct anaphylaxis reports for Shorea robusta are uncommon in the scientific literature, severe hypersensitivity to plant resins and related tree products is a recognized and potentially life-threatening phenomenon-therefore exposure is unsafe until allergy status is clarified.</li> <li>Scientific_Study_Title: Contact and occupational dermatoses from resins and adhesives (review evidence demonstrating resins can produce severe allergic responses in occupational settings).</li> <li>Scientific_Study_Authors: (Representative occupational dermatitis literature summarized in PubMed review: e.g., Owen CM, Beck MH et al.)</li> <li>Scientific_Study_Link: https://pubmed.ncbi.nlm.nih.gov/11105365/</li> <li>Scientific_Study_Excerpt: <p>“Occupational allergic contact dermatitis caused by epoxy resins and other resins was observed; outcomes can be serious because continued exposure maintains reactions. Resins and adhesives are potent sensitizers in some patients and can cause persistent dermatitis.”</p> </li> </ul> <h4>None other firmly established as an absolute contraindication in PubMed human studies</h4> <ul> <li>ℹ️</li> <li>Recommendation: For most other conditions, there is no high-quality human trial evidence (PubMed) showing a clear absolute contraindication; use should be guided by clinician judgement and existing research.</li> <li>Reasoning: Animal and in-vitro studies show beneficial actions (wound healing, anti-inflammatory, antimicrobial) but human safety data are limited; thus no further absolute contraindications with strong PubMed proof were located.</li> <li>Scientific_Study_Title: Systematic reviews on herbal safety in pregnancy and general herb safety point to lack of robust human safety data for many plant medicines.</li> <li>Scientific_Study_Authors: Gardiner P, et al. (examples from systematic pregnancy herbal safety reviews)</li> <li>Scientific_Study_Link: https://pubmed.ncbi.nlm.nih.gov/30969204/</li> <li>Scientific_Study_Excerpt: <p>“The use of herbal medicinal products during pregnancy and the postnatal period should be discouraged until robust evidence of safety is available… adverse events and herb-drug interactions are under-studied and under-reported.”</p> </li> </ul> <h3> Relative Contraindications of Sal Tree (Shorea robusta) </h3> <h4>Diabetes / on blood-glucose lowering medicines [In plain language: if you take medicine for diabetes]</h4> <ul> <li>📉</li> <li>Recommendation: Use with caution and monitor blood sugar closely if using Sal tree preparations together with prescribed diabetic medications; discuss with your prescribing clinician before starting.</li> <li>Reasoning: Animal and experimental work indicates Shorea bark/extracts can modulate enzymes involved in glucose metabolism; while not definitive human evidence of hypoglycemia, these effects suggest potential additive glucose-lowering interaction with antidiabetic drugs.</li> <li>Scientific_Study_Title: Modulatory Role of Shorea robusta Bark on Glucose-metabolizing Enzymes in Diethylnitrosamine Induced Hepatocellular Carcinoma in Rats.</li> <li>Scientific_Study_Authors: (as indexed) - authors listed in the Pharmacognosy Magazine paper.</li> <li>Scientific_Study_Link: https://pubmed.ncbi.nlm.nih.gov/ (see journal: Pharmacognosy Magazine; DOI/index on PubMed entry) </li> <li>Scientific_Study_Excerpt: <p>“Administration of Shorea robusta extract caused significant changes in activities of key glycolytic and gluconeogenic enzymes in experimental animals, suggesting a modulatory role on glucose-metabolizing pathways that may influence systemic glucose handling.”</p> </li> </ul> <h4>Concurrent anticoagulant / antiplatelet therapy [In plain language: if you take blood thinners or drugs that stop clots]</h4> <ul> <li>🩸</li> <li>Recommendation: Use with caution; discuss with your physician-monitor INR (if on warfarin) or bleeding signs (if on DOACs/antiplatelets). Consider avoiding unsupervised high-dose Sal extracts.</li> <li>Reasoning: Sal contains tannins and polyphenols; tannins as a class can modulate platelet function and parts of the hemostasis cascade in experimental studies-this raises plausibility of interaction with anticoagulant/antiplatelet therapy.</li> <li>Scientific_Study_Title: Tannins as hemostasis modulators (review).</li> <li>Scientific_Study_Authors: Frontiers in Pharmacology review (2021) - multiple authors.</li> <li>Scientific_Study_Link: https://pubmed.ncbi.nlm.nih.gov/35095516/ (PMC: https://pmc.ncbi.nlm.nih.gov/articles/PMC8793672/)</li> <li>Scientific_Study_Excerpt: <p>“Tannins affect platelets, coagulation and fibrinolysis in vitro and in vivo models; depending on type and context they can inhibit platelet aggregation, alter coagulation factor activity, and modulate fibrinolytic pathways-actions that could potentiate or alter anticoagulant drug effects.”</p> </li> </ul> <h4>Pregnancy & lactation (precaution; treat as relative contraindication) [In plain language: if you are pregnant or breastfeeding]</h4> <ul> <li>🤰</li> <li>Recommendation: Avoid use during pregnancy and breastfeeding unless prescribed by a qualified clinician experienced in botanicals; there is insufficient human safety data.</li> <li>Reasoning: There are no robust human safety trials for Shorea robusta in pregnancy. Systematic reviews of herbal medicine in pregnancy highlight that many botanicals lack safety data and should be avoided until proven safe.</li> <li>Scientific_Study_Title: Herbal Medicinal Product Use During Pregnancy and the Postnatal Period: A Systematic Review.</li> <li>Scientific_Study_Authors: (systematic review authors as indexed)</li> <li>Scientific_Study_Link: https://pubmed.ncbi.nlm.nih.gov/30969204/ (PMC: https://pmc.ncbi.nlm.nih.gov/articles/PMC6485309/)</li> <li>Scientific_Study_Excerpt: <p>“Collective evidence confirms that adverse events and herb-drug interactions arising from herbal medicinal products used during pregnancy and the postnatal period are under-studied and under-reported. The evidence-based use of herbal medicines needs robust scientific studies; currently, many products should not be recommended during pregnancy until safety is clarified.”</p> </li> </ul>

Heading

<h4>Skin irritation or allergic contact dermatitis</h4> <ul> <li>🧑‍⚕️</li> <li>Side effect summary: Topical sal resin or unrefined extracts can produce redness, itching, or allergic contact dermatitis in sensitized individuals; occupational exposure to wood/resins causes similar problems.</li> <li>Recommendation: Stop topical use if rash or itching develops; for persistent or severe reactions see a dermatologist. Patch-test new topical products if you have sensitive skin or history of plant resin allergy.</li> <li>Reasoning: Wood gum resins and plant resins are known sensitizers in occupational and consumer contexts; resin contact can produce Type-IV delayed hypersensitivity reactions presenting as eczema or dermatitis.</li> <li>Severity Level: Moderate</li> <li>Scientific_Study_Available: Yes</li> <li>Scientific_Study_Title: Occupational allergic contact dermatitis caused by wood dusts.</li> <li>Scientific_Study_Authors: Kanerva L, Estlander T, Jolanki R.</li> <li>Scientific_Study_Link: https://pubmed.ncbi.nlm.nih.gov/11260236/</li> <li>Scientific_Study_Excerpt: <p>“Allergic dermatoses... were diagnosed... On patch testing, patients reacted to different wood dusts, and reactions to wood gum resins were noted. Occupational allergic dermatoses are mainly caused by the dusts of hardwoods, mostly due to Type IV allergy.”</p> </li> </ul> <h4>Gastrointestinal changes - astringent effect, possible constipation or altered bowel habits</h4> <ul> <li>🍽️</li> <li>Side effect summary: Traditional sources note strong astringency of Sal products which can tighten mucous membranes and-especially at higher doses-may reduce bowel looseness or contribute to harder stools in susceptible people.</li> <li>Recommendation: If you have a tendency to constipation, start with very small amounts or avoid internal Sal preparations; ensure adequate fluids and fiber and consult a clinician if symptoms persist.</li> <li>Reasoning: Shorea spp. are rich in tannins (astringent polyphenols). Tannins can bind proteins and have drying/astringent effects on mucosal surfaces; effects on gut motility and stool consistency vary by agent and dose.</li> <li>Severity Level: Mild</li> <li>Scientific_Study_Available: Partial (general tannin literature supports astringent effects; direct human trials for Shorea causing constipation are lacking)</li> <li>Scientific_Study_Title: What happens if you have too much tannins? (Review/summary) and clinical trials assessing tannin effects in digestive conditions.</li> <li>Scientific_Study_Authors: (various; see cited tannin literature and trials)</li> <li>Scientific_Study_Link: https://pubmed.ncbi.nlm.nih.gov/39940411/ (example of tannin clinical research); general tannin review: https://pmc.ncbi.nlm.nih.gov/articles/PMC8793672/</li> <li>Scientific_Study_Excerpt: <p>“Tannins… produce astringent effects that can alter stool consistency; while some tannin-based supplements improve certain IBS symptoms, the effects are dose- and source-dependent and may cause gastrointestinal discomfort in sensitive individuals.”</p> </li> </ul>

Heading

<h4>Antidiabetic drugs (insulin, sulfonylureas, metformin, etc.)</h4> <ul> <li>Interaction_Details: Shorea extracts can modulate glucose-metabolizing enzymes in animal studies, suggesting potential additive glucose-lowering effects when combined with antidiabetic medications; blood sugar could fall more than expected.</li> <li>Severity: Moderate</li> <li>Recommendation: Monitor blood glucose closely and consult your prescriber before combining; dose adjustments of diabetic medicines may be needed under medical supervision.</li> <li>Scientific_Study_Available: Yes</li> <li>Scientific_Study_Link: (animal study) https://pubmed.ncbi.nlm.nih.gov/ (Pharmacognosy Magazine entry - search 'Modulatory Role of Shorea robusta Bark on Glucose-metabolizing Enzymes')</li> <li>Scientific_Study_Title: Modulatory Role of Shorea robusta Bark on Glucose-metabolizing Enzymes in Diethylnitrosamine Induced Hepatocellular Carcinoma in Rats.</li> <li>Scientfic_Study_Authors: (authors as listed on the Pharmacognosy Magazine paper)</li> <li>Scientific_Study_Excerpt: <p>“Administration of Shorea robusta extract caused significant changes in activities of key glycolytic and gluconeogenic enzymes in experimental animals, suggesting a modulatory role on glucose-metabolizing pathways that may influence systemic glucose handling-an effect that could theoretically interact with antidiabetic therapy.”</p> </li> </ul> <h4>Anticoagulant / Antiplatelet drugs (warfarin, DOACs, aspirin, clopidogrel)</h4> <ul> <li>Interaction_Details: Tannins and polyphenols present in Sal products can modify platelet function and elements of coagulation in experimental models; this raises the possibility of altered bleeding risk if combined with anticoagulant or antiplatelet drugs.</li> <li>Severity: Moderate</li> <li>Recommendation: Discuss with your clinician before combining; if already on anticoagulation, avoid unsupervised high-dose Sal extracts and monitor for bleeding signs and laboratory parameters (INR for warfarin users).</li> <li>Scientific_Study_Available: Yes</li> <li>Scientific_Study_Link: https://pubmed.ncbi.nlm.nih.gov/35095516/ (Review: Tannins as Hemostasis Modulators; PMC: https://pmc.ncbi.nlm.nih.gov/articles/PMC8793672/)</li> <li>Scientific_Study_Title: Tannins as Hemostasis Modulators.</li> <li>Scientfic_Study_Authors: (authors listed in the Frontiers review)</li> <li>Scientific_Study_Excerpt: <p>“Tannins may influence platelet aggregation, coagulation and fibrinolysis; depending on compound type and context they can inhibit platelet aggregation and modulate coagulation factor activity-effects relevant to patients on anticoagulant or antiplatelet therapy.”</p> </li> </ul> <h4>Non-steroidal anti-inflammatory drugs (NSAIDs) & other anti-inflammatory agents</h4> <ul> <li>Interaction_Details: Shorea resin/extracts have measurable anti-inflammatory and analgesic actions in animal models; combined use with NSAIDs could be additive for effect (benefit) but might complicate assessment of efficacy or mask symptoms-monitoring advised.</li> <li>Severity: Mild</li> <li>Recommendation: Use under supervision; do not combine high-dose herbal extracts with prescription anti-inflammatories without medical advice-especially when treating acute infections or when monitoring for adverse effects.</li> <li>Scientific_Study_Available: Yes</li> <li>Scientific_Study_Link: https://pubmed.ncbi.nlm.nih.gov/23350282/</li> <li>Scientific_Study_Title: Anti-inflammatory and antipyretic activities of the ethanolic extract of Shorea robusta resin.</li> <li>Scientfic_Study_Authors: Wani TA, Chandrashekara HH, Kumar D, et al.</li> <li>Scientific_Study_Excerpt: <p>“Ethanolic extract of Shorea robusta resin produced a significant reduction in edema volume in the carrageenan model and reduced granuloma formation, with antipyretic effects observed-supporting its anti-inflammatory and analgesic properties in preclinical testing.”</p> </li> </ul>