When your body lacks this vital nutrient, you may experience a range of debilitating symptoms, including persistent fatigue, anemia, neurological challenges, digestive disruptions, mood swings, muscle weakness, vision impairments, glossitis, and even skin pallor or jaundice
Cyanocobalamin This is the synthetic version of vitamin B12 used in supplements and in the B12 shot
Phase 2 trials used subcutaneous 1 mg/day
A GP did test my levels again when I reported my symptoms returning before he would agree to me having more frequent injections than the usual 3 monthly
PMID 16163497
The high-dose vitamin preparation quickly provides the requisite energy, and is much more effective than vitamin B12 preparations in tablet form, which have to take a detour through the stomach and intestine