After a hair transplant, the transplanted hairs will largely shed within 3 weeks after treatment.
The transplanted follicles will go into some sort of 'sleep mode' after which the follicles temporarily do not produce hair. This is absolutely normal and this sleep period is very different from person to person (usually 3-6 months).
Below you can find a table indicating an average regrowth after a hair transplant.
You can use Nanogen Hair fibers as of 2 weeks after hair transplant to increase the volume. Nanogen hair powders are safe to use after a hair transplant and there is a choice between 10 different colors.