Yes hair thickening products such as the hair thickening shampoo does work to thicken your hair.
The hair thickening products don't work overnight and when you do use hair thickening products you have to be patient and continue using the hair thickening products for at least 1 to 4 months to see results.
I used hair thickening shampoo on my hair every 3 days for 4 months and then I saw my hair thicken quite a bit.
Although you should notice a little bit of hair thickening within a month of using the hair thickening shampoo or other hair thickening products.
You can also take hair thickening supplements by mouth and the hair thickening supplements will add vitamins to your body which helps keep your hair healthy, thick and shiny as well.
Taking the hair thickening supplements along with using the hair thickening shampoo often enough can thicken your hair and keep the hair thick.