Its core physiological function is to catalyze the methylation of nicotinamide (NAM, a key precursor for NAD+ synthesis) with Sadenosylmethionine (SAM) to produce 1methylnicotinamide (1MNA)
It gets even more important when you realize that vitamin B12 is vital for cellular energy production and detoxification systems via the glutathione pathway (1)
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Its not classified as a controlled substance, but selling it as a health product violates Canadian law
Because autoimmune gastritis is a chronic, lifelong condition, your body will never regain the ability to absorb B12 from food normally [1] [5]
The most obvious is that they are easy to take, and you can keep a large supply in your home for daily use