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Recommended Dietary Allowance: Mayo Clinic: While the recommended daily amount of vitamin B-12 for adults is 2.4 micrograms , higher doses have been found to be safe
NICE recommends more frequent injections (alternate days until no further improvement) for patients with neurological involvement
patients seeking those should specifically ask whether the clinic prescribes them
Without it, purity claims are marketing copy
While oral supplements are convenient, injections offer significant advantages for many people
For people without a deficiency, benefits may be subtle or minimal
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