Hair has always been very thin and soft, always sticking to the scalp, and it looks very oily. Is there any product that can improve this hair quality?

I have the same problem as you. Even after styling, my hair still looks flat and ugly. I recommend you to use Shiseido's scalp vitality essence for professional hairdressing. Use it once every morning and evening on a clean scalp to improve hair quality from the scalp. Generally, it will not stick to the scalp after several uses, and it will have obvious thickening effect after about one month. This product adopts Shiseido patented technology adenosine hair growth, which can be used by both men and women without stimulation. I used to ask my friends to bring them from abroad, but now they are also listed in China and can be bought in major professional hairdressing salons.