Yes very safe and effective.

If you are doing freshly juiced juice in large enough quantities you will be maintaining a proper caloric intake and giving your body the nutrition it needs while giving it a break from the work of digesting foods.

It seems to me if you have been able to do a few 21 day Water Fasts you will have no problem doing a juice fast for a couple of months.

Pi

Watch the documentary " Fat, Sick and Almost Dead"... it is about a man who used juicing for 60 days and the results he discovered... very good!!! You can find it free online by googling the name.

do a fruit and veg's juice fast. I don't think there is a limit on how long you have to due it since that's how my primary food intake is.