Grape seed oil is processed from the seeds of grapes, which are formed as a by-product of wine making. Making this oil is actually a brilliant idea from a business perspective. For thousands of years, wine manufacturers have been left with tons of this useless by-product, grape seeds. Due to modern technological advances, they are now able to extract the oil from the seeds… something that wasn’t possible a hundred years ago. The oils are usually extracted in factories using an industrial process. It involves high heat and various chemicals… which includes the toxic solvent hexane
The “healthier” types of seed- and vegetable oils are “cold pressed” or “expeller pressed” – this is a much more natural way to extract the oil from the seeds. If your oil doesn’t explicitly state how it is processed, then you should assume that it was extracted using chemicals like hexane.