Whole resin chunks of Boswellia Serrata in the sieve. No need to grind the resin or prep it in any way. Boswellia Serrata, B. carterii, B. Sacra and B. Papyrifera all contain a high percent of Boswellic acids. As many of you know, Boswellic acids have proven to be anti-inflammatory and anti-cancer in laboratory studies and are likely the main compounds that led to Frankincense’s long traditional use as medicine. There are no Boswellic acids in the essential oil of frankincense.