bulksupplements.com white willow bark extract powder - anti inflammatory supplements - hand nerve stimulator (250 grams - 8.8 oz) bulksupplements white willow bark (salix alba) is a species of willow that is native to europe and asia. it has been used for thousands of years for its purported benefits. white willow bark extract (salix alba) may assist in maintaining body weight in individuals.* it also fortifies the immune system, supports the heart, and supports the skin.* this extract is the powder form.