While Cool Whip is gluten-free, it is not vegan-friendly. This is because it contains casein, which comes from milk. While casein is not a major allergen for vegans, it can be a problem for those who have allergies to dairy products. Therefore, cool whip should be eaten in moderation and with extreme caution. A safer option is to make your own cool whip. It is easy to make and only takes a few minutes.