Having an OWYN (Only What You Need) Protein Shake occasionally is relatively safe for most people. However, as with any dietary supplement, some individuals may experience side effects or adverse reactions, especially if they have specific sensitivities or allergies to the product's ingredients. Some potential side effects or adverse reactions associated with regularly consuming OWYN protein shakes may include gastrointestinal discomfort, such as bloating, gas, or digestive issues. This may happen because certain ingredients, such as fiber, pea protein, or guar gum, can be difficult for some people to digest. Individuals with allergies or sensitivities to ingredients such as pea protein, sunflower, and flaxseed oil, all common ingredients in OWYN protein shakes, may experience allergic reactions such as itching, digestive issues, swelling, hives, or difficulty breathing.