All food acids lower the pH of a dish, so you can use the substitute of your choice without losing the effect the acid creates, such as the coagulation of milk when making cheese or the activation of pectin when making jam. Substitute 1 tablespoon of lemon juice or white distilled vinegar for every 1/2 teaspoon of citric acid called for.
Easy Vegan Falafel Burger. Chickpea patties (OMIT all spices except garlic and cilantro, additionally OMIT sesame and oil, substitute citric acid for lemon flavor, and no sauce or toppings except lettuce/ mung bean sprouts for PHASE 1 Exzema Diet)
Not everyone has citric acid powder in the kitchen, but many people keep lemon juice on hand. If you're about to make a recipe calling for citric acid and don't have it on hand, you can easily substitute lemon juice instead. The exact amount will depend on what type of recipe you're making.