One of the 11 people arrested at two assisted pregnancy clinics under investigation was remanded in custody on Sunday.
The clinics, in Athens and Thessaloniki, are alleged to have paid foreign women for their ova and used unapproved medicines to help customers become pregnant.
The man remanded in custody is a pharmaceuticals salesman and is regarded as being the key suspect in the probe.
A magistrate in Thessaloniki decided to release the other 10 suspects, including three doctors, on bail. They were ordered not to leave the country.