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Do not increase dose during weeks 1-2 regardless of lack of visible results

According to the NIH Office of Dietary Supplements, B12 supplementation does not improve athletic performance in athletes with sufficient B12 status. This statement, backed by decades of research, contradicts much of what youll hear in medical spa waiting rooms

Birch, Nicola E

"Relation of blood homocysteine and its nutritional determinants to age-related maculopathy in the third National Health and Nutrition Examination Survey"

Vitamin B12 plays an important role in red blood cell formation, DNA synthesis, and nerve cell communication

[10] Common adverse reactions include transient injection-site discomfort, acne, seborrhoea, increased body hair, mild fluid retention and elevations in haematocrit that may require dose reduction or therapeutic phlebotomy if haematocrit exceeds 54 %