Your liver generates glutathione, a potent and advantageous antioxidant, for your body
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Glutathione and collagen use different transport systems and serve different biological purposes, so they do not "compete" for absorption in a way that would make either ineffective
As many with Pernicious Anaemia will attest, since 2016 GPs more and more rely on blood serum test results for B12, ignoring the low sensitivity of the test and, more concerningly for the patient, ignore the symptoms and risk factors for B12 deficiency due to a lack of knowledge about Pernicious Anaemia in the healthcare profession
Moreover, there are a few studies which indicate that these compounds may also prove useful in the treatment of neuropsychiatric disorders including depression [19, 20]
Theres no environmental pollution actively attacking your skin cells