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For oral peptides, bioavailability is typically very low, often in the single digits, because the gastrointestinal tract destroys most of the compound before it can be absorbed

This is vastly more dilute than topical formulations, but isolated cells in culture have direct peptide access without any barrier to penetration

Patients with clinically confirmed deficiencies may begin with weekly injections and then transition to a maintenance schedule

Conclusion B12 injections offer a powerful solution for people dealing with vitamin B12 deficiency, particularly when absorption issues make oral supplements ineffective

When you function better, you feel better

Some individuals especially those sensitive to changes in methylation activity describe feeling overstimulated or jittery with high-dose methyl B12