White Willow Bark Extract 4:1 by Heking

White willow bark is born in waterside wetlands and is cultivated all over the country. It is mainly distributed in the Yangtze River basin and South China. Deciduous trees, 10-12 m tall. Drooping long branches, underbranches brown glabrous, slightly hairy when young. The leaves are lanceolate, or linear-lanceolate, 9-16 cm long and 5-15 cm wide, with long, pointed tips. Citi in March to April, the waiting period is April to May. It can be collected all year round and used on bark. Salix babylonica bark extract is Salix babylonica. The bark extract. White willow bark extract has the effect of improve immunity.