All Luxtra grades originate from plant oils, which yields the high Naturally Derived Index (NDI as defined by ISO 16128). We do not add anything else to our products to ensure the NDI is as close to 1 as possible. Our end products, despite having plant origins are not found in nature, and therefore can be viewed as synthetic. Essentially, we take the best nature has to offer, and then upgrade it to deliver the best performance and NDI to our customers.