You can feel free to use any shampoo and conditioner that works for your scalp, and does not cause irritation or dryness. Your choice of shampoo/conditioner will not have any noticeable impact on the efficacy of the treatment.
However, the best shampoo and conditioner for hair loss are typically those that will support your other hair loss treatments by effectively cleansing and moisturising your hair and scalp, without overly drying or damaging the hair. For this reason, it is recommended to look for products which are sulfate-free.