Hello. i had wanted to know if it's safe to heat up prune juice on stove top or microwave to make it more warm and for how long. ?

Microwave : I use.the microwave and.depending on.size of.cup.,half minute to one minute is usually okay

Yes ....: ... it is safe. Either method is ok, but it's best to avoid boiling. How long depends on how cold it is when you start: if taking bottle from the fridge, you probably need to pour out a glass, and heat at least a minute, but perhaps at 60-80% reduced power. Stove top ok, but seemingly more work. It is a great idea to enhance fiber in diet and stimulate a bowel movement. Good wishes:)