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The deltoid and gluteal muscles are common sites for these injections

Here's a breakdown of who might typically be allowed to use such injections: 1

Pancreatic Insufficiency: The pancreas helps with B12 absorption, and not enough of it can cause deficiency

Conversely, medications like metformin, H2 blockers, and proton pump inhibitors can reduce the absorption of Vitamin B12

The FDA considers it a non-toxic substance under the Generally Recognized as Safe (GRAS) classification for specific applications

The shoulder Experienced doctors commonly administer B12 injections into the upper arm area by inserting the injection into the deltoid (shoulder) muscle