For those with absorption issues, gastrointestinal conditions, or severe deficiencies, injections provide a fast, reliable, and efficient solution that oral supplements simply cannot match
A B12 deficiency can cause a variety of health problems, so it's often used to treat or prevent it
The choice depends on muscle mass and the doctors preference
Without intrinsic factor, oral supplements won't work, making injectable B12 for humans often necessary
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Put plainly, the off period is not there because the compound stops working it is there because no one can point to human data showing that running it indefinitely is safe, and a scheduled break is the honest way to respect that gap