Dr. Johnson is a topical anti-inflammatory pain killer. It has been designed to treat all kinds of discomfort including muscle aches, back pains, arthritis, and sprains. Formulated with crystallized menthol, these products are easily absorbed by the skin for instant pain relief. When rubbed over the affected area, these products reduce swelling of the affected joints and muscles. Easy to use and fast acting. Available in 30g and 100g