With that said, taking too much oral, intranasal, or intramuscular B12 may cause some of the following symptoms: Headaches Nausea and vomiting Diarrhea Tingling in the hands and feet Fatigue or weakness You should be aware of medication interactions with B12, such as metformin and proton pump inhibitors (PPIs)
Yet the consequences are unknown Bioavailability: there are four specific metabolic steps necessary to convert cyanocobalamin into one of the coenzyme forms, which is a clear metabolic disadvantage (3) Utilisation problems: certain hereditary diseases, as well as metabolic disorders, prevent the conversion of cyanocoalamin into the active B12 forms (4) Steals methyl groups: cyanocobalamin requires a methyl group to convert into methylcobalamin, which it takes from the important amino acid S-adenosylmethionine (SAM)
Now, some people can be more at risk of developing vitamin B12 deficiency
Research peptides from Durham Peptides and virtually all peptide suppliers are shipped as lyophilized (freeze-dried) powder
These fat-burning lipotropic injections can be done as frequently as once or twice a week