Do NOT look at the instructions on the box. Remove the red protective cap from the serum bottle. Attach the metal applicator (syringe) and apply it to your hair. Don't finish the whole bottle, it's too much for one go. Put the red cap back on the remaining serum, hold the applicator in water and lift it into its box. In this way, you can use each serum bottle 2-3 times. Thus, a box of serum lasts for 3-4 months. I just started using the product. It is too early to speak for the result. However, I have used it in the past and was satisfied. [product:vichy-dercos-aminexil-clinical-5-men-21-monodoses-58]