People get vitamin B12 primarily from animal products, including eggs, meat, dairy products, and fish, so a balanced diet can easily achieve the needed levels of this nutrient
Staying well-hydrated is crucial, particularly if experiencing vomiting or diarrhea, though large volumes of fluid with meals should be avoided as this may worsen symptoms
For example, if the initial benefits wane, the dosage or frequency of injections may need to be adjusted
If you are specifically testing for iron or anaemia, you might prefer to wait until a few days after your period ends to get a more "everyday" reading of your iron stores, but for a general thyroid check, proceeding as planned is perfectly fine
B12 is also involved in the synthesis of hormones and neurotransmitters
The manufacturer explicitly advises keeping the vial in the carton to shield it from light