In most cases, it is highly recommended to keep lemon juice refrigerated once the bottle has been opened. Exposure to air, warmth, and light can accelerate the deterioration process, leading to a loss of flavor, aroma, and nutritional value. Refrigeration acts as a protective barrier, helping to preserve the vibrant qualities of lemon juice for as long as possible.
Most commercial lemon juice bottles explicitly advise consumers to refrigerate after opening. This not only maintains the fresh, zesty flavor but also minimizes the risk of bacterial or mold growth that can occur when the juice is stored at room temperature for extended periods. If you frequently use lemon juice, keeping it chilled is a simple yet effective way to ensure its quality and safety over time.