Superfen Gel is used for relieving muscle and joint pain, swelling, and inflammation. It contains Capsaicin, Diclofenac Diethylamine, Linseed Oil, Menthol, and Methyl Salicylate, which work together to provide fast-acting pain relief. Diclofenac acts as an anti-inflammatory agent, reducing pain and redness, while Capsaicin inhibits pain signals from reaching nerves. Menthol and Methyl Salicylate produce a cooling and warming effect on the skin that distracts from pain, and Linseed Oil nourishes the area.