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The injection Hydroxocobalamin is given as an intramuscular injection (into a muscle), typically by a trained healthcare professional
Improvements in chronic fatigue due to B12 injections can be noticed as early as one week

Saving $20 on a vial while injecting unknown substances is not a reasonable tradeoff

Many cheap supplements use magnesium oxide, which is poorly absorbed and often causes digestive discomfort

[114] Methyltransferases Methyl (CH 3 ) group transfers between two molecules
