Hi @Curious25
1. Generally, according to what I have learned from Eugenix, most men can harvest between 3-4k lifetime from beard without affecting aesthetics of beard.
2. I have heard Dr. Sethi say that they prefer to put beard hair on scalp rather than using it to restock donor- although he said they have done this.
Dr. Arika said that beard to scalp tend to be excellent with around 60% of patents, 20% have moderately good results and 10-20% not so good.
She attributes the poor results to 'slow growing/patchy' beards. During a consult, she asked what my face looks like 24 hours after a shave. When I told her you can see a little outline of stubble, but not really stubble, she said I probably have 3-4k lifetime beard grafts to use.
If you are someone who might not see growth on beard for 3-4 days after a shave then your beard might not be very viable. On the other hand, if you shave in the morning and have to shave again at night because it is getting stubbly, you might have a lot more beard grafts to use. There was a case of a guy named Rahul (case is detailed on this forum), a full blown NW7 with depleted donor in which they used a bit over 1k scalp grafts and something like 9k beard grafts and a couple of thousand from the chest to successfully fill his entire head. I was told that he had such strong and fast growing beard hairs that he had to shave 2x per day.
Hope this helps!