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Unless the cause of B12 deficiency is temporary i.e

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People with nerve problems or brain disorders should be careful with B12 supplements

Vitamin B12 injections bypasses digestion, which means it goes directly to your system for faster effects

That gap is why some people supplement for months without their bloodwork budging, while a shot can move the needle far sooner than you'd expect

Standard research cycles run 812 weeks with 46 week washout periods to prevent receptor downregulation