Although anabolic steroids are perhaps the most well-known substances that bodybuilders inject to bulk up muscle, they also sometimes inject other substances, including natural oils — like sesame oil, walnut oil and paraffin — to make their muscles appear to be larger, the report said. Natural oils are less expensive than anabolic steroids, which may make them an attractive option, particularly for amateur bodybuilders, the report said. http://www.yycindustry.com/bodybuilding-oil/