Depending on the type of seed, oils are also distinguished by their greater or lesser tendency to go rancid: transparent bottles contribute to the process because they do not shield the oxidizing action of light. For these reasons, it is advisable to transfer the seed oil into dark bottles, always carefully close the cap and store them in places away from sources of light and heat. Despite their initial good nutritional properties, it is important to remember that seed oils, through the refining process, lose a good part of their nutrients, so it is preferable to choose varieties of oil obtained with mechanical extraction, “first pressing” and better if cold-extracted.
Does seed oil have an expiration date? In general, oils last 12-18 months: after that they inevitably start to go rancid. By applying the precautions above you can extend its life up to 18-20 months, but you will see that the flavor (and nutritional properties) will gradually be lost. Consuming rancid seed oil is not dangerous: it will not cause major problems, but some small digestive problems for sure; if the seed oil is going rancid, you can reuse it as a strengthener for nails and hair. If you have already used it and want to dispose of it, remember to take it to the nearest recycling center.
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