(Purchased with my own money) Treatment for dry and frizzy hair

I purchased this product with my own money after trying a sample at Head Spa. For reference, the lid is a twist-off type like a bottle cap, but it comes with an additional lid that allows you to squeeze it out and swap it out for use. At first, I didn't know how to do it properly and tried to force it open, so I ended up opening it incorrectly. My hair is neutral, but whenever I used shampoo first, it felt stiff, as if all the nutrients were being stripped away. This could be because I usually only shampoo my hair and it is wavy, or it could be due to my washing method. I also seem to dye my hair at least once a season. Since I had heard that treatments contain more nutrients than conditioners, I tried samples I had collected from various places, and the Head Spa product was the one that felt right for me. After washing my hair with a shampoo bar and squeezing out some water, I squeeze a small amount of this product onto my scalp and apply it. The instructions also state that it is a highly concentrated nourishing treatment that turns into a cream type when mixed with water. When I sprayed it on wet hair and touched it, it really did turn into a cream. When I massage it in with my fingers to ensure even application and then rinse, my stiff hair becomes calm and smooth, as if it really absorbed the nourishment. It doesn't tangle when I comb it with my fingers, either while drying or afterward, so I have been using it with satisfaction until recently.