I would respectfully ask if the B12 test could be repeated, I have learned here that B12 supplementing can alter folate levels so I wonder if your folate level being considerably above the high end of the range has masked your B12 deficiency and affected your B12 levels
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Peptides and similar research compounds often require a stable, sterile diluent
Vitamin injections are in-office procedures that can be performed during your lunch hour or on the way home from work
Unfortunately, many people don't get enough B12 in their diets, which can lead to a variety of health issues

It includes 1-5 intramuscular or subcutaneous injections of 1000 mcg crystalline cyanocobalamin daily, followed by oral doses of 1000-2000 mcg/day Parenteral administration should be reserved for those with significant neurological symptoms NICE guideline: Vitamin B 12 deficiency in over 16s: diagnosis and management: Malabsorption as the confirmed or suspected cause of vitamin B 12 deficiency: Offer replacement to people if: lifelong intramuscular vitamin B12 Autoimmune gastritis is the cause They have had a total gastrectomy They have had a complete terminal ileal resection If the person has a vitamin B 12 deficiency because of malabsorption that is not caused by autoimmune gastritis, or a total gastrectomy or complete terminal ileal resection (for example, malabsorption caused by coeliac disease, partial gastrectomy or some forms of bariatric surgery): Offer vitamin B 12 replacement and Consider intramuscular instead of