Movie about magic water

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The thing isolated becomes incomprehensible
I sawa movie when I was a kid, that I can't remember the title! It had a horror atmosphere though I can't remember if it was horror!

It was about a woman arounf 30 or 40 years old who buys some kind of water that in theory makes her young again! It works and she loses about 10 years. The thing is, when she stops drinking it she turn a lot older, like in her 80s... On the end, her husband fins out and drinks the water too so they can become two old people together!



The thing isolated becomes incomprehensible
No, I don't believe so...

It doesn't hv so much fantasy... When she drinks water, it really is water, doesn't look like magic!



The thing isolated becomes incomprehensible
It's not that either! She turns into an old woman, not a monster!

I remember that some delivery guy brings the water to her home!



The thing isolated becomes incomprehensible
I remember the whole scheme worked like: every bottle is very expensive but you have to keep buying so you won't become older the next day!