They do not represent FDA-approved dosing
Being aware of these potential side effects can help individuals make informed decisions about whether B12 shots are the right choice for them
For most healthy adults, the difference is minimal, because both forms restore B12 levels effectively
The time when you will notice significant changes in response to B12 supplementation is when you ask how long B12 takes to work
The same applies if your elevated B12 is accompanied by abnormal results on other labs (liver enzymes, kidney markers, CBC), or by symptoms like unexplained weight loss, persistent fatigue, abdominal pain, or easy bruising
It is hard to know how often these are truly caused by the peptides