Betulin (Birch Bark Lupane Triterpene · Antiviral · Hepatoprotective · Betulinic Acid Precursor)
| Compound | Betulin (Betulinol; Trochol) |
| Chemical class | Terpenoid — Triterpene (Lupane-type; 3β,28-diol) |
| CAS | 473-98-3 |
| Primary source | Betula spp. (birch outer bark, 10–35% of dry weight — one of the most abundant plant triterpenes) |
| Key applications | Antiviral; anti-inflammatory; hepatoprotective; wound healing; pharmaceutical betulinic acid precursor |
| Claim strength | Moderate |
| Typical form | Birch bark extract; betulin isolate (≥98%); precursor for betulinic acid semi-synthesis |
| Buy from Herbuno |
Birch Bark Liquid Extract (Water Soluble) - Betula alba → Birch Leaf Liquid Extract (Water Soluble) - Betula alba → |
Name origin: From Betula (birch genus). Betulin is the 28-hydroxymethyl analogue of lupeol in the lupane triterpene pathway (lupeol → betulin → betulinic acid) — oxidation of lupeol’s isopropenyl C-28 to hydroxymethyl gives betulin; further oxidation to carboxyl gives betulinic acid. Betulin is extraordinary in its natural abundance — comprising 10–35% of birch outer bark dry weight, making it one of the most abundant naturally occurring triterpenes on Earth. The white appearance of birch bark is partly due to betulin’s crystalline deposits in the outer cork cells. Traditional use: Birch bark has been used across Eurasian and North American indigenous cultures for millennia — as a wound dressing (antiseptic and wound-healing), in traditional medicine for skin conditions and inflammatory diseases, and as a structural material (birch bark canoes, baskets, roofing). The pharmacological relevance of betulin to these uses has been confirmed by modern research. Research trajectory: Betulin has documented antiviral, anti-inflammatory, and hepatoprotective activity but has attracted less research attention than its downstream metabolite betulinic acid (which has selective anticancer activity). Betulin’s primary commercial significance is as the bulk starting material for betulinic acid semi-synthesis — chemical oxidation of betulin C-28 hydroxymethyl to carboxylic acid. Commercial source: Birch Bark extract from Herbuno delivers betulin as the primary triterpene alongside lupeol and betulinic acid.
Evidence for Betulin Applications
Antiviral activity: Betulin inhibits HIV (reverse transcriptase inhibition), HSV-1/2 (glycoprotein-mediated entry inhibition), and HCV replication in cell models. Anti-HIV activity was identified in NCI screening programmes in the 1990s. Betulinic acid has superior anti-HIV potency, but betulin contributes antiviral activity independently. Claim strength: Moderate (in vitro; limited in vivo).
Anti-inflammatory — NF-κB and COX-2: Betulin inhibits NF-κB and COX-2 in macrophage models, reducing pro-inflammatory cytokine production. In arthritis animal models, oral betulin shows anti-inflammatory and anti-arthritic effects. The anti-inflammatory profile is similar to lupeol but with different potency. Claim strength: Moderate (animal).
Hepatoprotective and anti-obesity: Betulin activates AMPK (AMP-activated protein kinase) in liver and adipose tissue — reducing hepatic lipogenesis and improving insulin sensitivity in high-fat diet-induced obesity animal models. The Suomalainen/Mervaala group (Finland) demonstrated betulin significantly reduces adiposity and hepatic steatosis in obese mice, partly by modulating SREBP-1c (sterol regulatory element-binding protein 1c) processing. This AMPK-activating anti-obesity mechanism is pharmacologically interesting. Claim strength: Moderate (animal; no human trials).
Wound healing and skin barrier: Topical betulin promotes keratinocyte migration and proliferation, restores skin barrier function, and demonstrates antimicrobial activity against common skin pathogens. Birch bark ointments standardised to betulin are used in European wound care settings for chronic wounds and burns. This is the most clinically established topical application. Claim strength: Moderate (limited clinical; strong traditional).
Birch Bark Liquid Extract (Water Soluble) - Betula alba →
Birch Leaf Liquid Extract (Water Soluble) - Betula alba →
Browse Standardised Extract Powders →
Dosage & Formulator Specification
Oral supplement dose: not established in human trials. Animal model effective range: 50–200 mg/kg/day. For topical wound-care applications, birch bark extract ointments use 5–20% betulin w/w. Birch Bark Extract Powder from Herbuno delivers betulin as the primary triterpene. Specify betulin + betulinic acid + lupeol content by HPLC on CoA. For pharmaceutical betulinic acid synthesis applications, betulin purity ≥98% by HPLC is required. Betulin is poorly water-soluble — oil-soluble or lipid-based delivery formats are required for oral and topical applications.
Frequently Asked Questions — Betulin
Why is birch bark white?
The distinctive white colour of birch bark (Betula papyrifera, paper birch; B. pendula, silver birch) is primarily due to betulin crystallising in the outer cork cells (rhytidome). Betulin’s white crystalline appearance, combined with its high concentration (10–35% of outer bark dry weight), coats the outer bark cells and produces the characteristic white colouration. The same cells also contain lupeol and betulinic acid at lower concentrations. The contrast with inner bark is striking — inner bark is orange-brown from other phenolic compounds without betulin accumulation.
How does betulin differ from betulinic acid pharmacologically?
Betulinic acid (C-28 carboxylic acid) is the more pharmacologically potent downstream metabolite of betulin. Betulinic acid has well-documented selective anticancer activity — particularly in melanoma, neuroblastoma, and glioma — via mitochondrial apoptosis induction. Betulin has broader but generally lower-potency pharmacological activity across antiviral, anti-inflammatory, and metabolic pathways. Betulin’s primary significance is as the high-abundance birch bark constituent used to semi-synthetically produce betulinic acid (chemical oxidation of the C-28 hydroxymethyl to carboxylic acid).
Is birch bark extract safe?
Birch bark preparations have a long history of human use with a generally excellent safety profile. Betulin itself is non-toxic in animal studies up to 500 mg/kg oral doses. Birch bark extract in traditional European medicine and modern wound-care applications has not been associated with serious adverse events. The primary safety consideration is birch pollen allergy — individuals with birch pollen allergy (common in temperate regions; approximately 25% of Europeans) may have oral allergy syndrome cross-reactivity with birch bark preparations, causing mild oral itching or GI symptoms.
What is Birch bark’s role in traditional Finnish medicine?
In Finnish and broader Scandinavian/Baltic traditional medicine, birch bark has one of the most developed ethnopharmacological profiles globally. Uses include: wound dressings (antibacterial and wound-healing), topical anti-inflammatory applications for joint pain, diuretic preparations, and mouth care. Finnish pharmaceutical research (led by groups at University of Helsinki) has systematically validated betulin and betulinic acid as the primary bioactive constituents behind traditional wound-healing and anti-inflammatory applications, contributing to the commercial birch bark extract pharmaceutical market in Scandinavia.
Related compounds: Lupeol, Betulinic Acid, Ursolic Acid, Boswellic Acid
Claim-strength scale – High = multiple human RCTs; Moderate = limited trials or strong preclinical convergence; Emerging = early-stage lab or animal data.
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