Vitamin E will also oxidize quite quickly once exposed to air. While they may accomplish this job, there will definitely not be anything leftover to act as a beneficial supplement to the pet consuming the food. We'd rather have you spend your money on your own fresh vitamins that you can take proper care of, and add yourself, so your pet will truly benefit from them. Yes, there are ground flax seeds in Home Made 4 Life, and they are very beneficial. However, the seeds lend more in terms of fiber, while the oil provides a greater benefit in terms of Essential Fatty Acids.
Oils go rancid quickly, and that process is speeded up by exposure to air.
We feel that the quality of the oil would be compromised, and that it's best to add oils just before feeding to get the best quality and make sure your pet receives the full benefits. Oils can be safely frozen without harming their integrity. But once you have opened the bottle of oil, the oxidation process begins. This is why they must be stored refrigerated and kept tightly closed. We suggest a trip to your local health food store to find what you need.