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It is often prescribed for individuals with pernicious anemia or other conditions that impair B absorption (for example, after gastric surgery or in certain digestive disorders)
The absorption speed of B12 depends on the form you take, since methylcobalamin works faster than cyanocobalamin
Its also worth being careful with expectations: if your B12 levels are already normal, injections are unlikely to be a meaningful energy boost
2007 Jul;30(7):834-9
ONLY MIX WITH STERILE BACTERIOSTATIC WATER The purity and sterility of bacteriostatic water are essential to prevent contamination and to preserve the shelf-life of dissolved peptides
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