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Everyone knows this. Itâs a citrus fruit. Inside the body however, when lemon juice has been fully metabolized and its minerals are dissociated in the bloodstream, its effect is alkalizing and therefore raises the pH of body tissue (pH above 7 is alkaline). Please notice the difference.
A pH of 7 or less is considered acidic, which means all juice is acidic, but some is better-tolerated than others. For reference, citrus fruits such as lemon juice has a pH of 2.0 to 2.6, grapefruit a pH of 3 to 3.8 and orange juice a pH of 3.3 to 4.2, while apple juice has a pH of 3.4 to 4 and milk a pH of 6.3 to 6.6. Acidity in juice creates a sour taste, though the sourness is often offset by the natural sugar in juice.