Low power laser hair brush which stimulates the skin to encourage hair growth; laser hair restoration and therapy apparatus for clinical use; head coverings with light emitters located therein to direct light onto the scalp to stimulate hair growth; centrifuges for medical purposes; apparatus and instruments for the preparation of prp (platelet rich plasma); devices for medical procedures in the nature of hair transplant and replacement; medical devices that provide therapeutic dosing of transcutaneous electrical pulse current to stimulate hair growth; medical devices that provide therapeutic dosing of transcutaneous ultrasound to stimulate hair growth; medical devices that infuse high molecular weight modalities into the skin for hair growth