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The honest answer is that it depends, and it depends most on whether you are actually deficient
What Happens After Your First B12 Injection Following your first B12 injection, several physiological processes begin immediately, though you may not feel different straight away
The Short-Term Timeline: Days 3 to 7 By the end of the first week, the initial surge settles into a steadier supply of B12, and this is often when the more noticeable day-to-day changes appear
Injections vs
If you have low B12 or a true deficiency, these shots can work wonders Image content: This image is available to view online
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