Some suppliers publish batch certificates of analysis naming an independent laboratory
That being said, coverage for Vitamin B12 injections varies among insurance providers and may depend on medical necessity
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Injection discrimination There are often comparisons made between insulin and B12 injections and whilst everybody understands that insulin is essential and required by each patient in different amounts some health professionals mistakenly think that B12 is a placebo, a frivolous want for lazy people with hypochondria and Munchausens Syndrome
Food and Drug Administration (FDA), and are not intended to diagnose, treat, cure, or prevent any disease or medical condition