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The science of metabolism has evolved, focusing on things like enzyme regulation and mitochondrial performance

Intramuscular injections of vitamin B12 are widely used as a standard treatment for vitamin B12 deficiency

If you do have decreased kidney function and your doctor recommends methylcobalamin, you may need a much higher dose because its less stable, so be sure to ask them about whats best given your condition

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Dosing by body weight category Under 160 pounds (72kg): Start with 300mcg daily

Oral supplements are an option for those who dont like shots, but its key to check blood levels often to make sure the dose is right