Methyl Salicylate Camphor Menthol Genuine Efficascent Oil 100ml. Efficascent Oil is the most used liniment brand in the market that specially formulated for headache and body pain. It has a combination of safe and effective formula that helps in relieving tiredness and any body discomforts including back pain, muscular pains, joint pains, stiff neck, headache, cramps, and even minor sprains and strains.