Yes and no. Because there is a high concentration of Omega-3 in every teaspoon, some people experience a fishy taste while others don’t. The care and handling of our product after opening dramatically improves user experience. For best taste, keep it refrigerated. We designed our omega-3 so that it would pour at 40ºF. Shake well before using. While Brain Booster is stable over time, it may de-emulsify. By shaking, you mix the flavoring agents and fish oil for optimal flavor and taste. Use it up. If you start a bottle, finish it or discard in 30 days. While we have validated our shelf life to >2 years unopened, like any food product you need to consume it once it’s opened.