A lot of people asked how I use GHK Cu (copper peptide) with a pen device, so here's a quick tutorial showing exactly how I do it. In this video I show how Amazon.com: Neurogan GHK Cu Copper Peptide Hair & Scalp Serum 2400mg, 4% Copper Peptides Fast Absorbing, Water Based Formula for Hair Softness & Shine Cosmetic Dry Scalp Moisturizer Spray, Made in USA : Glow from within with GHK Cu Copper Peptide , This powerhouse peptide supports collagen production, skin repair, and hair follicle health, helping improve skin firmness, radiance, and support GHK Cu Peptide Therapy Brea, CA Orange County Skin Restoration: Prioritizing Safety Over Trends