Below are some very useful links about Frankincense:

Medpage Today - Rheumatology

BBC - An Article how Frankincense can ease arthiritis

This is london - Frankincense, a wise man's remedy for arthritis

Celestialtides - a Good historic and general guide to Frankincense

NHS - Frankincense for Osteoarthiritis

Mind in the Heart - Frankincense and the mind

BBC - An article how Frankincense could cure Cancer