extreme fatigue after b12 injection I Feel Tired All the Time. Do I Need a Shot?: Shawn Veiseh, M.D.: Family Medicine B12 Injections & Home Nurses

Vitamin B12 is water-soluble, meaning your body eliminates excess through urine rather than storing it to potentially toxic levels

For most healthy individuals, maintaining adequate intake through a balanced diet or a high-quality dietary supplement is sufficient to support red blood cell health, nerve function, and energy levels

VITAMIN B12, Hydroxocobalamin injection (injections)

Catargi B, Parrot-Roulaud F, Cochet C, Ducassou D, Roger P, Tabarin A

Some clinicians recommend keeping the dissolved tablet residue in the mouth for an additional 2 to 3 minutes after the tablet has physically dissolved, as residual semaglutide may continue absorbing through the oral mucosa during this period