Here is something I came across on the uses of lemon juice:
Lemon juice is excellent as a blood purifier. Upon rising in the morning, drink the juice of one lemon in a cup of warm water. It is excellent for use in cleansing enemas, as it balances the pH in the colon. It helps detoxify the system. Mix with distilled water. No drink can compare with the valuable properties, internally or externally. As a cleanser, it neutralizes and promotes healing.
Drinking lemon-water through out the day for an entire month can balance the pH in the entire body, which is one of the best things you can possibly do for your health.
Eating large quantities of lemons for 3 weeks has even been known to heal and cleanse the liver of toxins. If you plan on doing this, be sure to coat the stomach with a little olive oil before consuming the lemons. If this interests you, send a reply to this post and I will give you more detailed instructions.
Caution: If you have ulcers, avoid lemons and other citrus fruits.