White willow bark may also alleviate acute back pain, joint pain ... comes from a resin found in the bark of the frankincense tree. Boswellia oil is used in the manufacturing of food, cosmetics ...

Tests on a drug made from tree bark have produced 'conclusive' evidence ... the drug could have negative side effects, including skin pain and diarrhoea. But she added: 'On the face of it, these ...