[DOI] [PMC free article] [PubMed] [Google Scholar] 122.Kredich NM
All current evidence comes from preclinical animal and cellular studies, meaning its efficacy and safety in people remain unproven
And this is where the most significant differences emerge
Theres a higher risk of potential adverse effects and regulatory concerns, whereas oral glutathione is considered very safe, says Williams
We look at who should take B12 injections, how quickly your body starts using them, and how long the effects last
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