People with uncontrolled hypertension, heart disease, glaucoma, or who are pregnant typically shouldn't take it, which is exactly why a proper medical review matters more than a quick online script
One might use 0.5 mg/mL cyanocobalamin while another uses 1.0 mg/mL methylcobalamin
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Stopping or review points should be considered if resting heart rate climbs persistently, sleep is significantly disrupted, or any liver-enzyme or metabolic-panel value moves substantially outside the personal baseline range
Gastrointestinal upset is infrequent but has been noted (e.g
Those with active cancer should consult an oncologist, as growth-factor modulation could theoretically influence tumor growth