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Vitamin B12 injections are most clinically appropriate in cases of confirmed vitamin B12 deficiency, malabsorption syndromes including pernicious anaemia or post-gastric surgery, significant symptoms where rapid restoration of vitamin B12 levels is required, or failure of oral supplementation due to poor absorption

Kusmaul N, Miller VJ, Cheon JH

Side Effects of Excessive B12 Intake Whilst vitamin B12 toxicity is uncommon, several adverse effects have been reported in association with very high B12 levels, though establishing direct causation remains challenging

many patients notice an immediate difference

Purity testing The company states each batch undergoes testing to confirm 99% or greater purity