The Policia Nacional busted a lab that contained enough materials to make three million doses anabolic steroid.
The clandestine site was located within a city in Alicante that has not been named.
11 people were arrested for delivering steroid to customers by hand to minimise the risk of being detected.
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Six locations were raided, and more than 300,000 illegal doses and three kilograms of active ingredients and were impounded.
Material used to manufacture the steroids was imported mainly from Asian countries in packets that were marketed as flour, pasta and nutritional supplements.
The final product was made in a lab that used oils, colourings and other cutting agents.
The gang leader is said to have pocketed at least €15,000 per month from the enterprise.
He did not want to attract the attention of authorities. For this reason, he declined suggestions of expanding sales nationwide.