does injectable vitamin b12 need to be refrigerated B-12 for Horses, Dogs and Cats — Jeffers Discover the Life-Giving Power of

However, oral vitamin B 12 can be absorbed passively independent of intrinsic factor

Intravenous is usually done under hospital care when patients are in dire need of receiving large doses rapidly

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A healthcare professional should administer the injection

Although your doctor may put aside their concerns if/when you explain that you have been supplementing with vitamin B12, it's not outside the realm of reason that your doctor may still want to bring you in to rule out serious illness

If theres an absorption issue, regular top-ups may simply become part of your routine going forward