How do I convince my mom to get me Apetamin tablets?

helloitsmethere
I have been trying for years to gain weight. I recently gained 15 pounds, but I'm stuck and my body is preventing me from gaining any more. I have tried EVERYTHING. I used to be 5'3" and 85 pounds and for some reason (idk how) I gained 15 pounds in six months... probably just puberty FINALLY doing what it is supposed to do. According to BMI I'm still underweight at 100 pounds. I'm thinking of getting weight gain tablets. How do I convince my mom to let me take them?
How do I convince my mom to get me Apetamin tablets?
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