After 28 days, both potency and sterility become questionable
Vitamin and nutrient injections are compounded formulations used within clinical practice based on provider-directed care and patient-specific considerations
This should be followed by once-monthly B12 injections
Even small amounts, when taken repeatedly, can increase the risk of inflammation, oxidative stress, and long-term toxicity
The NICE guideline recommends that doctors first use one of the primary tests for B12
Verification with serum methylmalonic acid and/or serum homocysteine level may be necessary in asymptomatic patients with high-risk conditions, symptomatic patients with low-normal levels of vitamin B 12 (200 to 350 pg per mL), or symptomatic patients in whom vitamin B 12 deficiency is unlikely but must be excluded