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Jed Davis Size:15ml Glass https://www.verywellhealth.com/thmb/yw3xZiGg93gxscaXk0TyOkvcnEQ=/1500x0/filters:no_upscale():max_bytes(150000):strip_icc()/healthy-and-unhealthy-stool-89211-color-V1-9cef9502a0a5433994307575289f34c7.png By Daisy Lin Medical Writer • Reviewed April 25, 2026 For UK B12 injection therapy, hydroxocobalamin is the NHS first-line — the BNF and the British Society for Haematology both recommend it because it has longer plasma retention than cyanocobalamin, allowing every-2-to-3-month maintenance dosing rather than monthly COVID-19
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