I read further information on the studies you listed on kidney storage as this seems to be where b12 is mostly found other than the liver
protect from light Single-dose devices (used once and discarded) have no "after first use" storage period because they should be discarded immediately after injection: Semaglutide (Wegovy) : Single-dose pen
Energy & Focus+ $199/month $199/ month GLP-1/GIP Contains Tirzepatide, NAD+, and Vitamin B12 Compounded Tirzepatide injection formulated with NAD+ and Vitamin B12 to help support balanced focus, sustained energy, and metabolic performance
Conflict of Interest Statement All reports in the Ontario Health Technology Assessment Series are impartial
Established low ranges are often too low, and researchers have found that normal-low B12 levels have been associated with neurological symptoms such as difficulty balancing, memory lapses, depression, mania, fatigue, and even psychosis
Any Side Effects to Know About