not responding to b12 injections

Size:1000 mcg/ml - 10 ml (Pack of 5) Purity & Quality Hospira Pfizer B12 injection cost and recommended frequency? https://media.post.rvohealth.io/wp-content/uploads/2024/04/3530820-9-Best-Vitamin-B12-Supplements-in-2024-According-to-Dietitians-732x549-Feature.jpg

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