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Timeline for Recovery From B12 Deficiency If you are treating a B12 deficiency, you might ask, How long does it take for vitamin B12 to work
Reference: Liu M et al
When to stop Stop the protocol and contact your provider if you experience persistent redness or swelling at injection sites beyond 72 hours, fever, or any systemic symptom that does not correlate with the expected mild post-injection reaction
Regular injections can help reduce the risk of neurological issues from long-term deficiency
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