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In: McQueen C (ed) Comprehensive toxicology, 3rd edn

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For the injection technique side of your protocol, our companion guide on how to inject peptides subcutaneously covers syringe selection, injection sites, the 8-step technique, and the most common errors patients make in the first weeks of self-administration at Perfect B in Doral

Unfortunately, our bodies do not produce this vitamin naturally and with age it becomes harder to absorb it, resulting in B12 deficiency, which is very common and can lead to neurological difficulties and anemia