7 Science-Based Reasons Why You Can't Grow a Beard


Genetics determine beard thickness and fullness. Basically, if your father and grandparents have thick beards, you probably will too.


Your ethnicity may also affect your beard growth. Chinese men have less facial hair than Caucasian males, and Mediterranean men have the highest, according to studies.


Your hair may thicken with age. Facial hair development slows as a teenager but accelerates about 30.

Alopecia Areata

In alopecia areata, the immune system destroys its own hair follicles. Hair loss can be significant and occur on all body parts.


Testosterone won't modify your beard's patchiness, but it can affect its growth.

Diet and Exercise

Some men can grow a beard, but it's not healthy. It can appear coarse, spotty, and dry. Diet and exercise may be to blame.


Stress that makes you want to rip out your hair is different from stress that inhibits your hair from growing. Stress can cause hair loss.