Lemon juice adds brightness and acidity to almost everything. Here's what delivers the same effect.
Lemon juice is the acidic liquid pressed from the fruit of the lemon tree (Citrus limon). It has a pH of approximately 2–3, making it one of the more acidic common food ingredients. Its acidity comes primarily from citric acid (approximately 5–8% of its composition).
In cooking, lemon juice serves multiple roles: as an acid to balance sweetness and richness, as a browning inhibitor (the acid slows oxidation in cut fruit and vegetables), as a leavening activator (in combination with baking soda), as a curing agent (for ceviche), and as a flavour brightener that lifts other flavours and adds freshness.
The most direct substitute — similar acidity level and similar bright citrus character. Lime juice is slightly more bitter and less floral than lemon. In most cooking applications the difference is imperceptible; in desserts and cocktails the flavour shift is noticeable.
Provides similar acidity without the citrus flavour. Works well in dressings, marinades, and baking (where the acid activates baking soda). The flavour contribution is more neutral — add a small amount of lemon zest if lemon flavour matters.
Slightly milder than white wine vinegar with a faint apple note. Works well in dressings and baking applications. The fruity note is a reasonable approximation of citrus in some contexts.
Orange juice has a similar citrus character but significantly less acidity and more sweetness. Works in some dressings, marinades, and desserts where the sweeter, less tart profile is complementary. Reduce other sweeteners in the recipe if using.
Lemon extract provides the aromatic, flavour compounds of lemon without the acidity. Works in baking and desserts where you want lemon flavour but are not relying on lemon juice for its acid function. In applications where acidity is important (baking soda activation), add a separate acid source.