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The 2mL ratio (producing 2.5mg/mL) is the best choice for most researchers starting out
Doctors in the UK are expected to practice in line with evidence-based guidelines
Most side effects are mild to moderate and improve with continued use
Heart problems, including signs of rapid weight gain, general swelling or feeling like you're short of breath
Vegans and vegetarians B12 occurs naturally only in animal products
Levels in the low-normal range, between 200 and 300, may warrant supplementation even without overt symptoms, particularly in patients with risk factors for deficiency
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