No, exposing 310 MCT Oil to high heat will not reduce its nutritional value. Just make sure that when you’re cooking with the oil, it does not go past its “smoke point”. Don’t know what that is? It’s simple… If you heat up an oil and it starts smoking, it means it has reached its smoke point and should be removed from the heat immediately.
Since MCT Oil has a high smoke point, you can feel free to use it to cook, even at high temperatures, and feel secure that it will retain its nutritional value.