No beard on my face at the age of 27. What should I do?

Beard hair is a genetic trait similar to the color of your eyes and hair.  Some people are born with the genes for no facial hair.  Homeopathy will not likely grow a beard.

You could try applying minoxidil to your face.  You could also transplant hair from your scalp to your face.  Your donor supply is limited, however.  You may prefer to use this hair to restore the hair on your head if you have hair loss.  Do you have any family history of hair loss?  If not, the procedure of restoring a beard might carry less risk of depleting your donor supply should you lose your hair on the top of your head.  Beard restoration actually works quite well with the proper physician.  

Your best bet is to have a formal consultation with a hair restoration surgeon who has experience with facial hair. Homeopathy is unlikely to help.

You may have to wait for facial hair to grow. Check with other males in your family and see when their beard developed. Most patients I encourage to wait till around 30 years of age. 

You should get your testosterone checked and see if your levels are normal. Ask your dad when his beard showed up, and if he was late like you, then consider it genetic