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b12 self injection video Vitamin C and Techniques How to draw up B12
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For a detailed breakdown, the National Institutes of Health provides a great list of B12-rich foods that can help you make informed choices at the grocery store

B12 can show results for fatigue caused by deficiencies since it replenishes what the body is missing
The NHS advises that taking up to 2 mg (2000 micrograms) of vitamin B12 daily in supplements is unlikely to cause harm in healthy individuals

Most users experience mild energy increases within the first week, with more noticeable metabolic effects emerging after 2-3 weeks of consistent use