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on 9/17/18This varies depending on the individual's needs. For ongoing support, continuous use is suggested.
If you want it to make a lasting difference - yes.
Its like they are practically making you get every vitamin you are missing in your diet. That's a good thing if you are somewhere you can't get access to this stuff, or if you are convalescing, but personally I think we should just make an effort to go out and eat more vegetables.