Your protein!: It is your protein intake. If you are a teen, it your high growth hormone level as well, combined with weight training or other resistance exercise.
Answered 12/9/2013
5.3k views
A doctor has provided 1 answer
A doctor has provided 1 answer
A doctor has provided 1 answer
A doctor has provided 1 answer
90,000 U.S. doctors in 147 specialties are here to answer your questions or offer you advice, prescriptions, and more.
Ask your question