Everything that follows about doses and effects is trial data generated in monitored research settings, not evidence that any product sold to the public is the same material or behaves the same way
Similar to retinol, collagen and glutathione offer unique benefit, making it hard to compare them as it depends on your skin goals
Conversely, some of the secreted gastric proteins, such as the mucins, are essential for protection of the stomach lining from the corrosive effects of the HCl
In these cases, it is vital to consult with a healthcare professional before adding glutathione to your regimen
To understand the exact science behind this molecule before deciding if it's right for you, you can read what GHK-Cu is
Irritable bowel syndrome and mental health comorbidity - approach to multidisciplinary management