@LetTheRedeemed
Personally, I wouldn't recommend applying urea to your scalp. My hair is/was at its worst state ever, and this was the culmination of applying urea to my scalp for over a year (among many other factors.) It's my understanding that urea denatures collagen. My hair is improving since I ditched urea and started applying vitamin C to my scalp, which is an action that I took in an attempt to reverse the perceived damage done to my face/scalp skin wrought by urea. Vitamin C is, of course, considered supportive of collagen formation; as are red light and needling, which are common hair loss treatments.
In keeping with the topic of the thread, I am also currently applying dextrose to my scalp on a somewhat regular basis. I will let you all know if anything significant seems to happen.