It is very much about genetics. Surely there are many hormonal factors to hair growth, be it on your face, on your head, body etc., but checking your relatives (men, apparently

) can give an idea if facial hair growth is existent or non-existent.
I don't get very strong sideburns or full beard, I've tried to grow a bit longer but I remain at a "wannabe George Michael look", esque 90's ... Suits me, clean cheeks and neck pretty much, I guess Hollywoodian might be the beard-style.
Anyhow, I guess castor oil was mentioned, some women have used that on their eyelashes. Don't know how safe that is, on one's face it shouldn't cause issues. Shouldn't, as it can be comedogenic and cause pores to clog.
A balanced diet and healthy lifestyle accounts for a lot. Using proper skin care routine can keep your skin supple and "open" for it be able to push the beard out, so to speak of.
I checked, I'm repeating myself here a lot.

Haven't found that much new things related to beard growth, the castor oil has been mentioned. Overall, keeping your skin in good condition internally (good diet etc..) and externally (proper cleaning routine) helps a lot. If I don't take good care enough, I easily end up with ingrown hairs, even though I use a sharp razor and I've "studied" my face.
@acromegaly Did mentioned about not trimming it for 3 or 4 weeks and that's a good line to follow. You must allow the beard to try show itself, trimming before certain amount of time can make the look so uneven and cancel out the process.
Patience is needed, just like with PE.
