is it Dangerous to drink the Acai Berry Cleansing Juice if 15Years Old?

My daughter of 15 wants to do a detox, so i bought my daughter the Acai Berry Cleansing Juice, it says "Dietary Supplement" But i don’t know if it helps you lose weight (i doubt it). It says "Not Recommended for under 18". Is it alright if she drinks it ? Will there be harmful side effects ?

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