How many randomised, placebo-controlled human trials exist in your specific population
Your clinician may recheck labs 710 days after starting (reticulocytes/hemoglobin) and again around 8 weeks (NHS)
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Also just noticed- would expect B12 to be higher when on injections (usually over 1000 or even much higher
This includes older adults with age-related declines in growth factors and bone density, smokers (though quitting is more impactful than any supplement), diabetic patients whose healing capacity is compromised by metabolic dysfunction, and those with nutritional deficiencies