I use AVJ, I have been using it for a little over a year now. I started out using it straight to spritz my hair on wash day and then once to twice after that when I am re-moisturizing my hair. I now add AVJ, Water and 2-3 tablespoon of glycerine.
Now that the winter is upon us I may have to get to using just AVJ.
I have not had any issue with it, but I tend to use a leave-in over it and seal with my shea butter mix. I guess the leave-in and shea butter balances the protein effects. Beside AVJ is a pH balance-r. HTH