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(2001) Cobalamin supplementation improves cognitive and cerebral function in older, cobalamin-deficient persons

GHK-Cu still contributes, but calibrate expectations

There were no complaints of bruising or pain

It completely and firmly made treatment of B12 deficiency one size fits all and woe betide anyone who does not toe the line

However, for anyone with absorption issues (like pernicious anemia or IBD), oral supplements are often insufficient