The Munich prosecutors say a 45-year-old British national has been running an underground laboratory in Waldkraiburg, near Munich, since 2009.
He is accused of producing anabolic steroid drugs for athletes and body builders. A 36-year-old German is accused of helping him.
Purchasing the required substances in countries outside Europe, he sold the drugs online to customers across Germany, earning about 120,000 euros (90,066 pounds), the indictment said.
The prosecutor's office said the substances distributed exceeded the legal limit for personal use by more than 27,000 times.
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The other four indicted Germans, aged 31 to 59 years, were accused of purchasing some of the products.
The suspects have admitted to most of the allegations and are being detained.
A trial date is scheduled for next Monday.
(The story clarifies that accused have admitted to most, not all, of charges)
(Reporting by Tina Bellon, editing by Gareth Jones)
