(4) So, for anyone dealing with GI disorders that impair absorption, low stomach acid (age), or inadequate intake, or for vegans and vegetarians, getting enough vitamin B12 can be challenging
Oral supplements have to pass through the digestive system and may not be absorbed efficiently, especially in people with gastrointestinal conditions like celiac, Crohns, or gastritis
Imaging studies offer the most objective assessment but add cost and complexity
Unprescribed wellness or weight loss treatments Some wellness companies and alternative medicine providers offer vitamin injections without a prescription or proper medical evaluation
Once you know the concentration in mg/mL, a dose in mg becomes a volume in mL by simple division, and that volume becomes insulin-syringe units by multiplying by 100 (because a U-100 syringe is marked so that 1 mL = 100 units)
Supplied as a lyophilized powder in a sealed glass vial, 10 mg per vial