Lime Juice (Best Option)
1 tablespoon per 1 tablespoon of lemon juiceLime juice contains a similar concentration of citric acid as lemon juice, which provides the necessary acidity to balance sweetness and brighten flavors in smoothies. Its citrus oils also contribute aromatic compounds that enhance the overall sensory experience.
When substituting, use a 1:1 ratio to maintain acidity levels. Be mindful that lime juice can have a slightly more bitter note, so adjust sweetness if needed.
The final smoothie will retain a fresh, tangy profile very close to the original, making lime juice the most seamless replacement for lemon juice in smoothies.