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are b12 injections or tablets better Doctor Reveals: Injection vs Tablet TRUTH Millions of Seniors Over 50 Never Know Boost Your Energy FAST: Why
Description
Vitamin B12 injections are commonly recommended for patients who have difficulty absorbing this essential vitamin through diet or oral supplements alone

This means a lower and less predictable amount of the active compound might reach systemic circulation, potentially requiring higher doses and introducing variability into research findings

It is possible the human trials never delivered enough intact peptide to the relevant tissue to reproduce the rodent effect, though this remains a hypothesis rather than a demonstrated cause of failure
It has been explored for the treatment of neurodegenerative diseases