The special one ... that doesn't thin your blood or contaminate it with common cells. It had special blue plasma enhancement capabilities and was administered with a solid gold needle. I hope so anyway.
They are making ours in Middleport at the Steelite works as we speak Tills. It is mixed in the slip stirrers, and will come in an Oatcake patch that must be worn for 3 days on the chest. As far as I can ascertain the patch cannot be reheated and eaten with bacon cheese and tomatoes., or used to light the fire due to the new and exciting smoke emission laws.