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Severe deficiency or neurological symptoms require injectable b12 for faster repletion
Less than 1 year = 48% of adults or 69% of the eligible market 1-2 years = 12% of adults or 16% of the eligible market 2 years plus = 11% of adults or 15% of the eligible market (29 million adults) As with most GPG brands, the bulk of initial prescriptions will go to folks who do not maintain a weekly injection discipline for many reasons
Gantz I, Muraoka A, Yang YK, Samuelson LC, Zimmerman EM, Cook H, Yamada T
If you manage GI symptoms fine on the standard 4-week protocol, there's no reason to extend
No exhaustion
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