[3] [6] If no reversible cause is found, or when found it cannot be eliminated, lifelong vitamin B 12 administration is usually recommended
Products are not evaluated by the FDA or any regulatory authority for human use
Intramuscular (IM) injections are common for routine repletion of B levels, whereas intravenous (IV) administration might be used in emergency situations or when large doses are required quickly
For example, a vegan woman who hadnt been taking B12 developed a deficiency and had to be treated with such high doses of the vitamin that her face erupted in acne, as you can see at 4:49 in my video
These are the kinds of details that never appear in the clinical literature but make a real difference in daily practice
recent guidelines affirm its use (e.g., AHA updates, StatPearls reviews)