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The effects of a single B12 shot administered by our healthcare professionals at Hampton Health can last for about one to three weeks, with the body absorbing around 10% of the vitamin from each shot
If the reason is less clear, the care team may recommend review of symptoms, outside records, or broader follow-up before turning B12 into a repeating plan
This is a legitimate basis for clinical use but a different evidence tier than RCT data
The timeline for maximum benefit can extend to 8-10 weeks, particularly for patients with long-standing fibromyalgia or significant inflammatory burden
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