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Journal of Sports Sciences

2 The British Society for Haematology recommends intramuscular vitamin B 12 for severe deficiency and malabsorption syndromes, whereas oral replacement may be considered for patients with asymptomatic, mild disease with no absorption or compliance concerns

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

One systematic review and network meta-analysis of thirteen studies, published in Springer, evaluated three administration routes of vitamin B12: oral, intramuscular, and sublingual routes

It converts the food you eat into glucose for energy which makes it one of those essential nutrients

That's why health professionals widely recommend B12 supplements or regular intake of B12-fortified foods