Beauty and Style

To all the nutritionally competent people here, do you know what specific foods or drinks would improve and beautify the skin?

and why?

I know that Aloe Vera is very helpful for the face skin and I have a plant of aloe vera but i dont know how can i use it to improve my face skin and keep its beauty,

I’m only 12 and my sister’s birthday is coming up. I want to get her a skin/beauty product but I don’t know what. I’m also on a tight budget- $20 or less. Please don’t say the Neutrogena Wave, she doesn’t want that.