The bacteriostat is a preservative called Benzyl Alcohol that is added to sterile water for injection to allow the solution to be reused for up to 28 days
The benzyl alcohol preservative system inhibits microbial growth, maintaining vial integrity across multiple research preparations from a single container
The body cannot produce vitamin B12 on its own, so you need to keep your Vitamin B12 consumption on track through food and supplements or you can get Vitamin B12 Injections

According to a 2018 review, GHK-Cu as a cosmetic ingredient has demonstrated the ability to:3 Tighten loose skin Reverse age-related skin thinning Repair the skins protective barrier proteins Improve skin firmness and elasticity Reduce the appearance of fine lines and wrinkles Smooth rough skin Stimulate wound healing Lessen the appearance of photodamage (sun damage), hyperpigmentation, skin spots, lesions, and more Reduce inflammation and damage from free radicals Increase hair growth and thickness Additionally, in research from 2015, the authors noted that GHK-Cu may be able to stimulate collagen, regulate the skin remodeling process, attract immune cells to the site of an injury, and restore replicative vitality to fibroblasts (a cell that helps form connective tissue) in patients whove undergone radiation therapy for cancer.2 6 GHK-Cu isnt limited to topical/cosmetic forms, however