Symptoms of vitamin B12 and folate deficiency anaemia include: rapid breathing or shortness of breath headaches indigestion loss of appetite palpitations problems with your vision feeling weak or tired diarrhoea a sore or red tongue, sometimes with mouth ulcers problems with memory, understanding and judgment (cognitive changes) Some of these symptoms can also happen in people who have a vitamin B12 or folate deficiency but have not developed anaemia
Methylcobalamin is often marketed as a 'natural' or 'bioactive' form, though evidence regarding superior efficacy compared to cyanocobalamin remains limited for most people
European Journal of Pharmacology
Persistent headaches are not typical and could indicate issues with peptide purity, dosing errors, or unrelated medical conditions that coincidentally appeared during use
It is considered an investigational compound or research peptide, and its legal status may differ by country
Are B12 Vitamin Injections Safe During Pregnancy