You should provide addressed and stamped envelopes when needed.
If you’re going to send supplemental letters they should substantively add to your application.
Recommendations are essentially personal sales letters written on your behalf and it’s important that the letter writer put the best pitch forward.
Understand it this way: It’s clear that the more personal the letter, the better off you are.
This means you need to get to know your professors or more importantly, you need to give your professors an opportunity to get to know you.
When you approach someone to write a letter of recommendation, don’t hesitate to ask whether she can write you a strong letter of support.
If the person hesitates in any way, look elsewhere.
You may also be asked to submit a letter by someone familiar with your clinical experience, research, or work history.
[ GOOD TO KNOW: Who should write your medical school letters of recommendation?
Although this may be embarrassing, it will hurt you a lot more in the long run to have someone write you a lukewarm or unenthusiastic letter of recommendation.
Remember, schools fully expect these letters to be glowing endorsements.