1. Birch Bark Extract 2.Sample is available 3.GMP factory,Kosher,Halal Cert 4.large stock and prompt delivery Product name100% Natural Birch bark ExtractIntroduction1)Betulin: 70%, 90%, 98% CAS NO. : 473-98-3 Molecular Formula: C30H50O22)Betulinic acid: 50%, 90%, 98% CAS NO. : 472-15-1 Molecular Formula: C30H48O3DescriptionBetulin and betulinic acid are traditional medicine products of the ...