OAT MILK - Organic Oat Unsweetened. Source of calcium, Nut Free & Soy Free. PureHarvest Organic Oat milk was the first oat milk introduced to the Australian market back in 1995. For over 25 years we have been producing a creamy, nutritious oat milk using whole organic oats with no unnecessary additives. That means no oat flour, no gums, no emulsifiers & no preservatives; just simple, organic ingredients, produced right here in Australia.