ghk-cu recommended dosage humans How Much Should You Inject Daily? Doctor Explains Unlocking the Benefits of GHK-Cu:

Regular intake of these B vitamins, especially in individuals with kidney disease or those who have undergone bariatric surgery, is vital for maintaining a healthy cardiovascular system

May increase brain thiamine content - TTFD also has a demonstrated capacity to penetrate the blood brain barrier and increase thiamine levels in the brain and central nervous system, where it may be used to support optimal cognition and maintain autonomic nervous system function

Is injection or topical better for skin effects

That research should include looking them up on a Department of Health website to make sure they have a license and see whether they have any official complaints for malpractice or unprofessional conduct