vitamin b12 shots where to inject How Long Does It Take

If no problems occur, gradually increase to your target dose

If you have previous lab work showing a low vitamin D level, please provide the results at your appointment

If blood tests show clearly low levels (thresholds vary by lab, but often below roughly 200 pg/mL) or there are signs of anemia, a provider may recommend weekly injections for the first several weeks as a correction or "rescue" phase

Following a vegan or vegetarian diet, having gastrointestinal issues, having pernicious anemia, and taking specific drugs are issues that frequently result in a deficiency

[13] If you're injecting someone else, let them know you're about to inject the supplement