These include: B12 levels before injection: Individuals with low B12 levels may experience a more significant and longer-lasting benefit from a B12 injection than those with normal or high levels
Glycine and B12 may help mitigate some of these effects
Todd, at the University of Cambridge, used the LLD assay to extract the anti-pernicious anemia factor from liver extracts, purify it, and name it vitamin B 12
Cobalt is a metal (per American Council on Science and Health)
Before starting Vitamin B12 injection, it is crucial to discuss all your medical conditions, past and present, and all medications you are taking with your doctor or pharmacist

Beyond hair changes, watch for these warning signs: Energy and Physical Symptoms: Persistent fatigue and weakness Breathlessness Pale or yellowish skin Heart palpitations Dizziness or lightheadedness Cold hands and feet Neurological Symptoms: Tingling or numbness in hands and feet (pins and needles) Difficulty walking or balance problems Muscle weakness Cognitive and Mood Symptoms: Brain fog or difficulty concentrating Memory problems Mood changes, irritability, or depression Confusion Other Signs: Sore, red tongue (glossitis) Mouth ulcers Changes in vision Loss of appetite Hair and Appearance Changes: Increased hair shedding Hair thinning Premature greying Brittle hair Dry skin Weak, ridged nails If youre experiencing several of these symptoms alongside hair changes, B12 deficiency could be a contributing factor worth investigating