Store › White Willow Bark Tinture Image 1 of 1 White Willow Bark Tinture $20.00 White Willow Bark is a natural pain reliever, Anti-inflammatory, fever reducer, astringent and has blood thinning effects. Add To Cart Added! White Willow Bark is a natural pain reliever, Anti-inflammatory, fever reducer, astringent and has blood thinning effects.