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Most people try to correct fatigue, slow metabolism, or brain fog with over-the-counter supplements often without testing, guidance, or measurable results
Levels typically rise faster and more reliably with injections than with oral dosing for patients who have an absorption issue
Unlike most nutrients, absorption of vitamin B12 actually begins in the mouth where small amounts of unbound crystalline B12 can be absorbed through the mucosa membrane [16] Food protein bound vitamin B12 is digested in the stomach by proteolytic gastric enzymes, which require an acid pH (Even small amounts of B12 taken in supplements bypasses these steps, and thus, any need for gastric acid, which may be blocked by antacid drugs)
Average B12 Intakes in the U.S
When people choose to eliminate these foods from their diet they eliminate the natural sources of vitamin B12
