You can certainly use Aloe Vera Gel on your scalp! That is why it is an ingredient in the Shampoo A formulation! If you get good results from this, then great, but you don't have to do this! Of course, like any other ingredient, some people can be sensitive to it. This is why it is important to conduct a patch test before use, just o check for any irritation or reaction! If you are purchasing Aloe Vera Gel, then it is always important to check the ingredients list for blacklist ingredients as some brands do use them. If you are using Aloe Vera Gel straight from the plant it is important to prepare it correctly. We have instructions on how to do this in the Beginner's Guide to Making Hair Care at Home which is released during the 14 Day Challenge!