Site enhancement oil are compounds injected into muscles to increase their size.
[3][4] Site enhancement oil, often called santol or synthol (no relation to the Synthol mouthwash brand), refers to oils injected into muscles to increase the size or change the shape.
[6] The use of injected oil to enhance muscle appearance is common among bodybuilders,[7][8] despite the fact that synthol can cause pulmonary embolisms, nerve damage, infections, sclerosing lipogranuloma,[9] stroke,[1] and the formation of oil-filled granulomas, cysts or ulcers in the muscle.
[8][10][11] Rare cases might require surgical intervention to avoid further damage to the muscle and/or to prevent loss of life.
[citation needed] Sesame oil is often used in such mixtures, which can cause allergic reactions such as vasculitis.