ive been saving up and i finally have enough to buy peptides and other stuff like tretanoin what should i buy i have 200$

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i might buy tretanoin frm my friend in school cs he has a prescribtion for it should i or js buy peptides and if so which ones i have baby fat so would reta fix it n also bloated but not horrid physeiq ig im 140 pounds im 14

 

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also the exact amount i have is 217$