Because pumpkin seed oil has an intense, nutty flavour and is calorie-dense like all oils, a little goes a long way. Most people use about one teaspoon to one tablespoon per serving, depending on personal taste and the dish. Start with a smaller amount if you are trying it for the first time — you can always add more, but a heavy hand can overpower the other flavours in your meal. One tablespoon provides roughly 120 kilocalories, so keep portion size in mind if you are watching energy intake.
After opening, store the bottle in a cool, dark place away from direct sunlight and heat sources. A pantry or cupboard works well; some people prefer to keep it in the refrigerator, especially in warmer months, though this may cause the oil to thicken slightly (it will return to liquid form at room temperature). Make sure the cap is tightly closed after each use to limit contact with air, which can cause the oil to oxidize and lose quality over time. Pumpkin seed oil is best used within a few months of opening for optimal flavour and freshness. If the oil starts to smell rancid or off, discard it.