Id like to know this as well. Or another blend if oils including MCT and? @narta @Sampei @Spaceman SpiffBack to Castor Oil, has anyone ever tried a mix of Castor and MCT instead of a truckload of BB to thin the oil down? I'm going to use Test D so I don't need a ton of BB to hold my target of 300mg/ml. But I do think I'm going to need to thin out the castor oil a bit to make it easier to work with and I'd like to keep the BB to a minimum.