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)
Spread across the 10 to 12 draws that vial yields, each draw carries 8.3 to 10 mg, roughly a tenth of a typical NAD+ injection
The combined effect is faster, better-supplied tissue repair across muscle, tendon, and other soft tissue

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INFORMATION What is BPC-157 (20mg)
Age can also play a role, as stomach acid production often decreases in older individuals