Campesterol is a phytosterol whose chemical structure is similar to that of cholesterol. Many vegetables, fruits, nuts[1] and seeds contain campesterol, but in low concentrations. Banana, pomegranate, pepper, coffee, grapefruit, cucumber, onion, oat, potato, and lemon grass (citronella) are few examples of common sources containing campesterol at ~1–7 mg/100 g of the edible portion. Being a steroid, campesterol is a precursor of anabolic steroid boldenone. Boldenone undecylenate is commonly used in veterinary medicine to induce growth in cattle but it is also one of the most commonly abused anabolic steroids in sports. This led to suspicion that some athletes testing positive on boldenone undecylenate did not actually abuse the hormone itself but consumed food rich in campesterol or similar phytosteroids. A recent trial with dalcetrapid, a cholesteryl esterase transport protein (CETP) inhibitor.
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