The Aspen tree, also known as the Quaking Aspen, Populus tremuloides, grows in high altitude heavily in the northern and western areas of the United States The harvest of the Aspen takes place in the winter season to ensure that proper growth may resume in the spring. Residual Aspen biomass are used to make the Extract, ground into a powder, then macerated in water, filtered and spray dried. The specialized process used to manufacture Aspen Bark Powdered Extract isolates the antimicrobial salicylate content so that the extract provides a standardized salicylate content range of 54.0-60.0%. Sustainably grown and harvested.