When someone is genuinely deficient, they may notice improvement in energy or mental clarity within a few days, though this varies from person to person and is most likely in people who were low to begin with
If tests reveal that your levels are low, your doctor may recommend supplementing your diet with vitamin B12 or taking a vitamin B12 injection
For this reason, B12 injections are sometimes used to offset the many symptoms of vitamin B12 deficiency, such as fatigue and weakness, poor moods, and low concentration
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No randomized human trial has established a clinically validated dose all protocols derive from animal data and clinician case series, principally the Sikiric et al
Its important to obtain such injections from a reputable, licensed pharmacy to ensure proper quality and sterility