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Magnesium helps relieve head and muscle pain, while zinc offers immune support

While very high oral doses (1,000 to 2,000 mcg) can achieve some passive absorption without intrinsic factor roughly 1% of the dose is absorbed passively many clinicians prefer the reliability and rapid correction offered by injections in this population

If you've had a BAD experience with B12 shots, it's most likely that you do not tolerate or convert cyanocobalamin well (see if you can verify what form of B12 was in the shot that made you react poorly, and then stay away from that specific form if you can)

For daily maintenance and optimization, oral or sublingual methylcobalamin is effective, convenient, and far more sustainable than recurring injections