Theres a bunch of encouraging preclinical datathat is, animals and test tubesbut essentially no human studies other than a seriously unconvincing retrospective survey with no control group in Alternative Therapies in Health and Medicine
For scalp hair specifically, topical delivery is probably the better-studied approach and the more targeted one
Active Skin Conditions: Avoid applying copper peptides to areas with active infections, open wounds (unless specifically for wound healing under medical supervision), or severely compromised skin barrier until these conditions resolve
Journal of Drug Delivery Science and Technology
Signs and Symptoms of B12 Deficiency A lack of Vitamin B12 can show in many ways, including: Fatigue and Weakness : Early signs from not making enough red blood cells
Type 1 predominates in the sebaceous glands and scalp, contributing directly to follicular DHT levels