120 ml (half cup) freshly squeezed lemon juice or approx 1 liter of lemonade prepared from the same. Drink daily OR Dilute 60 ml of lemon juice with 180 ml of water and drink twice daily in morning and evening.
You can start with the second option till you become habituated in drinking the lemonade as per the first option. That should be your goal. This super drink will prevent kidney stones and also contributes to effective weight loss too. In fact it will give you a number of health benefits such as a daily dose of vitamin C to boost your immunity and improve health.
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