My scalp has itched something terrible with both human and synthetic hair.The first thing you should probably do with any type of hair is clean it before you put it in. I don't know if washing it would rule out the possibility of an allergic reaction but in my experience, washing the hair before you put it in makes a big difference. For my synthetic hair I soak it in vinegar to clean it.
I haven't used human hair in years because I don't wear micro braids or other braids anymore, which is what I used human hair for in the past, but even then I realized that human hair didn't last as long for me because my hair is very kinky and coarse and as my hair grew in it was just madness. Even as infrequently as I washed my hair back then, the braids would get fuzzy and all I could stupidly
do was prune the braids and that just resulted in shorter hair
I think the type of hair you use depends on what your style of choice is. For twists, I haven't found any affordable human kinky hair but so far the best hair I've found for twisting is Janet Collection afro marley braid. It's synthetic and the hair isn't itchy. My scalp gets itchy if I don't clean it (I have a scalp condition). If it was the hair than more than my scalp would be affected. Also, this is the only brand so far that I've found that enabled my hair to retain moisture. My hair wasn't dry at all when I took the twists out.
Finally, if you're experiencing breakage when you take out your extensions it could be that you're not moisturizing your hair properly. In the past I didn't moisturize my hair while it was in braids and I would get a lot of breakage too (I also wasn't into proper hair care either but I digress). While in braids I like to spritz my hair with a moisturizing spritz daily
, sometimes multiple times in a day, and I use my QB AOHC to moisturize my scalp and new growth. I'm really generous because I want to ensure my hair gets moisturized. A lot of people say synthetic hair dries out the hair, but so can human hair. Weave is a barrier to your real hair so you have to take proper precautions when doing weaves or extensions before, during, and after you take them out. That goes for human or synthetic hair. The condition of your hair before you install the extensions will have an impact on how your hair feels after you take them out. I also think the brand of hair matters. You get what you pay for. I'm not at all saying that human hair is better than synthetic. If anything, from my experience synthetic hair has been better for me because it blends better with my hair texture