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Think of it like this: if your car has been running on fumes for months, a quick pit stop for gas wont magically get you across the country
This ensures better absorption, particularly for people with gastrointestinal conditions or difficulty absorbing nutrients from food
Clinical B12 levels are achieved quickly, and the effects are more noticeable and predictable than with oral supplementation, where individual absorption rates vary widely
Cochrane Database Syst Rev
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Individual variation in NNMT expression NNMT expression varies significantly between individuals
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