I've had FUE and am looking for products to enhance the results?

FDA has approved on minoxidil (topical), Finasteride (Oral) and lasers for treatment of hair loss. Outside of these 3 , you would be taking a chance using anything else for that purpose. Most minoxidil related itch has to do with propylene glycol present in the liquid form, so you may want to consider switching to the foam

It is best to ask your surgeon about post operative care as each doctor has their unique regimen. There are no products that will enhance your results.  If the surgery went well, then you will have great results no matter what you do or don't do.

Transplanted hair should not need any extra help if the hair selection has been properly done. Here are the answer to your questions regarding the following:Nutrafol - contains vitamins and they are not necessarily helping your hair growth if you are only suffering from patterned baldness.Formula 82M - There not much solid scientific documentation about whether this formula can work better than minoxidil itself.Laser could be used to maintain your hair but it is more for laser cap and similar product that provide more energy to the scalp.  This can help certain people to maintain the hair that is still prone to baleness and transplanted hair done not need it.

There are no products that will increase the growth of your FUE, only good surgery.  You ban buy thickening agents in the pharmacy that will have the hair shafts take on some water, making each individual hair shaft thicker.