Overview
The genus Boswellia (family Burseraceae) contains approximately 25 recognized species, several of which produce aromatic oleogum resins historically used in religious, cultural, and medicinal contexts. The species most studied in modern clinical research is Boswellia serrata, native to India. Other species — including B. sacra, B. carterii, and B. papyrifera — are commercially traded as frankincense resins, but their composition differs from B. serrata and they have been studied much less extensively in clinical settings.
Understanding species differences matters for interpreting research: most clinical trials on joint health, IBD, and asthma used Boswellia serrata standardized extracts. Findings from these trials should not be automatically applied to other species.
Boswellia serrata (Indian Frankincense)
Distribution: India, particularly dry forest regions of Rajasthan, Madhya Pradesh, and Jharkhand.
Research relevance: The species used in the majority of published clinical trials. Standardized extracts form the basis for proprietary formulations including Aflapin®, 5-Loxin®, and AprèsFlex®, which have been evaluated in osteoarthritis, IBD, and asthma trials.
Active compounds: Primary boswellic acids include β-boswellic acid, 3-O-acetyl-β-boswellic acid (ABA), 11-keto-β-boswellic acid (KBA), and 3-acetyl-11-keto-β-boswellic acid (AKBA). AKBA has received the most research attention.
Boswellia sacra (Omani Frankincense)
Distribution: Oman, Yemen, and parts of Somalia. Considered premium-quality frankincense in traditional trade.
Research relevance: Limited compared to B. serrata. Contains similar boswellic acid classes but with different relative concentrations and additional terpenoids. Often confused with B. carterii in trade literature.
Boswellia carterii (East African Frankincense)
Distribution: Somalia, Ethiopia, and neighboring East African regions.
Research relevance: Limited clinical research. Resin contains boswellic acids but with different relative composition compared to B. serrata. Incensole acetate — studied in animal models for neurological effects — is found in B. sacra/B. carterii resins at higher concentrations than in B. serrata.
Boswellia papyrifera (Sudanese Frankincense)
Distribution: Sudan, Ethiopia, Eritrea.
Research relevance: Primarily in vitro studies. B. papyrifera populations are considered vulnerable due to overharvesting. Clinical research is very limited.
Why Species Identification Matters for Supplements
- Most clinical trial evidence is specific to Boswellia serrata standardized extracts
- Without species identification on a label, the product may contain any Boswellia species
- Extract composition varies substantially between species and between manufacturers
- Products labeled as "frankincense" may refer to multiple species or undefined sources
For supplement selection considerations, see the Buying Guide.