If you were on any dietary restrictions for other medical reasons, continue those as instructed by your doctor or dietitian
For instance, a study by Grace et al., on lambs receiving a single 2 mg subcutaneous B12 injection demonstrated significant increases in serum and liver B12 concentrations for up to 24 days compared to untreated animals (2)
What it does not yet have is a controlled human trial
Vomiting, anorexia, headache, irritability, tremors, and palpitations, can be overdose syndromes (33-34)
Nevertheless, studies utilizing more specific biomarkers of vitamin B 12 status, including measures of holo-transcobalamin and methylmalonic acid, have shown more consistent results and a trend towards associations between poor vitamin B 12 status and faster cognitive decline and increased risk of Alzheimers disease (82-86)
The fold should feel soft and mobile, confirming you have grasped fat rather than muscle