“Regarding letters of recommendation: students should ideally obtain letters from different sources,” Pierre Huguet, CEO and co-founder of admissions consulting firm H&C Education, wrote in an email. “Medical schools usually require 2-3 letters from science faculty members who have taught the student in letter-grade courses such as biology, chemistry, physics, or other related sciences. Some schools also require a letter from a non-science professor who has taught the student in a letter-grade humanities or social science course.”