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Vitamin B12 Injection is often supplied as cyanocobalamin injection 1000 mcg/mL, also written as 1,000 mcg per mL

Because vitamin B12 is essential for converting the food you eat into usable cellular energy, restoring healthy levels can help fight tiredness, sluggishness, and that mid-afternoon crash leaving you feeling more energized and productive throughout your day

Injections of micronutrient B12 at larger doses may be necessary for older persons to keep their vitamin levels appropriate

This leads me to cognitive struggles we can see with B12 deficiency

(2001, Int J Obes) showed that chronic treatment with AOD-9604 restored repressed beta-3 AR mRNA levels in obese mice toward lean-mouse values, characterizing a chronic-treatment mechanism that complements the fragment's acute lipolytic action