For hair growth specifically, combining topical GHK-Cu with microneedling is supported by the strongest evidence as shown in the 2025 Kuceki study which achieved 26.5% regrowth with this combination approach
Researchers do this to equalise pressure, but it introduces airborne contaminants and creates a positive pressure differential that forces solution back through the needle tract on every subsequent draw, accelerating bacterial contamination
This naturally occurring copper peptide plays an important role in tissue repair, inflammation regulation, and cellular health, making it valuable not only for appearance-focused goals, but also for recovery and long-term wellness
Exercise, diet, and brain health: from the perspective of gut microbiota regulation
L.BrockwellT
At levels below toxicity, B vitamins have traditionally been known to promote gains in body fat