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For skin rejuvenation, 1 mg per day is typical

This includes confirmed low serum vitamin B12 levels, pernicious anaemia, malabsorption states such as coeliac disease, inflammatory bowel disease, or post-gastric or bariatric surgery, unexplained anaemia, neuropathy or neurological symptoms consistent with vitamin B12 deficiency, a long-term vegan diet with symptoms or low levels, or failure of oral vitamin B12 supplementation

That said, within the community of people that use BPC-157 for therapeutic reasons for tissue rejuvenation and repair, there's been an ongoing debate as to whether or not you can take it systemically