Shaving hair does not alter its thickness, color, or growth rate. A razor cannot change or affect your natural keratin cells, making it impossible for shaving to impact these aspects.
We recommend shaving in the direction of hair growth; however, if you accidentally shave against it, you might give the hair a blunt tip. This tip may feel coarse or "stubbly" as it grows out, making the hair appear more noticeable and possibly darker or thicker, but it isn't.