This hair loss question was answered by Dr. Robert True of New York, NY who is a member of the Coalition of Independent Hair Restoration Physicians. His professional answer is below.
When can I start using hair care products after hair transplant surgery?
A few weeks after the hair restoration procedure, you can return to use of any of your preferred hair care products such as shampoos, conditioners, gels, mousses, etc.
We do believe that the Head and Shoulders and Neutrogena product lines are excellent for maintaining hair and scalp health, but you can use the products you know and like the best.
You can color your hair beginning one month after your treatment. It is safe to use semi-permanent or permanent coloring agents. Try to avoid strong bleaching agents as these can be damaging to your hair whether transplanted or native.
You can also use alopecia (hair loss) masking cosmetics such as Toppik, Courve, Nanogen, or DermMatch.
You can use a laser comb if you like. We know this will not hurt anything. Although there are claims otherwise, we have not seen adequate scientific evidence that low level laser therapy prevents hair loss or restores lost hair. There is evidence that ongoing use promotes thickening of existing individual hair shafts. It is ok to use this if you want. We have no preference of models or manufacturers.