Individual results vary because hormones and genetics are the main variables determining the growth of a thick beard. Eating a diet high in protein and vitamins, exercising regularly, getting enough sleep, and avoiding stress are all ways to maintain good skin and encourage hair growth. One medicine that some men find helpful when applied gently to the beard area is minoxidil, however because of its side effects, it should only be used after consulting a doctor. Be patient, full beard development might not always be possible naturally, and it will need several months of consistent upkeep.