Nature's Plus® Herbal Actives Boswellin® features 65% boswellic acids in each vegetarian capsule. Known as an adaptogen, Boswellin is popular in Ayurveda, the ancient Indian system of health and well-being. Free from artificial colors or preservatives. Free from common allergens yeast, wheat, soy, corn and milk. Hypoallergenic. Vegetarian. Gluten free.