I am 21 years old. I don't have a moustache and beard. How can I grow one?

If you were not born with the genetic trait of having beard hair, there isn't much you can do to grow beard hair.  The only way to have beard hair is transplant surgery.

2,000 grafts for both sides is probably on the low side.  However, men do have different beard density patterns.  Your best bet is to find a reputable hair facility to guide you.  Other good questions like yours is answered in the attached video.  Good luck!

Beard transplantation results can look just as natural as a native beard, when done correctly by an experienced Doctor. The results may vary depending on the extent of the problem, therefore careful examination of the beard area needs to be done before the procedure. If head hair is used as...

Topical minoxidil can cause skin irritation. If you are experiencing acne or ingrown hair see a doctor for an exam.

You cannot tell how "thick" your beard may be until it grows out in 6 to 12 months.  You also should have been told how many grafts were transplanted so you can have a general idea of what to expect.

There are no medications that will grow beard. Beard growth is a genetic trait.  If you are concerned about beard hair issues see a doctor for an exam.