The B12 gives you more energy so you can stay active and stick to your routine
If you show any symptoms, especially neurological, then start injecting methyl B12
Thorough documentation should include a full medical history, any relevant blood test results (though not always mandatory), consent, the product used, batch number, site of injection, and any adverse reactions
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People with B12 levels below 200 pg/mL are called B12 deficient and are likely to have symptoms - this could be due to medicines, strict vegetarian diets, or medical conditions