where to inject b12 shot How Give a Injection: Step-By-Step Instructions Vitamin B12 Injection Sites: All
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If they immediately offer a shot without asking, thats a red flag

Is there a reason why they've not offered you a loading dose of every other day for 2 weeks/ or until further improvement if you've neurological problems

So, we recommend using SL vitamin B12 rather than oral and IM, especially in patients who do not tolerate IM injection and patients who need prolonged vitamin B12 supplementation, such as patients with long-term metformin use and patients with pernicious anemia or with gastro-duodenal resection [5154]
Rotate the injection site each day to prevent irritation and lipohypertrophy [9]
