Omega-3 has a high degree of unsaturation, meaning it is particularly sensitive to temperature and humidity. This means that exposure to air can actually cause it to degrade easily.
Making cat snacks requires putting them through a heat treatment process for sterilization, which can reduce or degrade the nutritional benefits of omega-3. In addition, when making snacks, ingredients are exposed to external air for longer periods of time, making the end product harder to store.
To make matters worse, degraded omega-3 can actually have negative repercussions on your cat’s health when consumed over a long period of time. Thus, the safest and most efficient way to supply omega-3 is by limiting its contact with air. This is done by containing the omega-3 in a container, like a capsule.
In other words, when giving omega-3 to animals such as cats, you should make sure to store the omega-3 somewhere cool and dry, away from direct sunlight.