A Question About: Meal Replacement Powder(for protein shakes)?

I am: 12 years old, almost 13. I eat around 1200-2000 calories everday.
Am I Allowed To Use: Meal Replacment Powder In Recipes, resembling Smoothies? If So, how many types per week can I use it & ho much should I use?

(Answer ALL my questions please, and whoever does explicitly who Ill choose as "Best Answer!"
Be Honest. Thank You. Have A Good Day! Bye. =}
Answers:
I personally wouldn't use such powder in recipe, you're just adding more calories into the stuff you spawn which is not what they are intended for.

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