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Together, they work from within to fade dark spots, reduce dullness, and promote a naturally even, radiant complexion

In other words, toxicity from B12 is extremely rare

Diagnosis of elevated vitamin B12 begins with serum B12 measurement, typically performed as part of routine blood tests or when investigating anaemia, neurological symptoms, or other clinical concerns

We could not locate the study these numbers are supposedly drawn from, and given how thin the actual human evidence for injectable GHK-Cu turns out to be (covered below), we're sceptical anyone has run the comparison rigorously enough to produce a number like that at all