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Description
This tetrapeptide, consisting of just four amino acids, was developed by Russian gerontologist Vladimir Khavinson beginning in the 1970s

However, that also means there's no published research showing this specific combination is safe, either

Boronic acid derivative activates pyruvate kinase M2 indispensable for redox metabolism in oral cancer cells
Sweden, 2009
In PA, autoimmune attack destroys parietal cells and/or neutralises intrinsic factor via antibodies