As such, we may struggle to absorb the vitamin B12 from food
However, you should: Call 999 or go to A&E immediately if you experience signs of a severe allergic reaction (difficulty breathing, severe throat/facial swelling, or collapse) Contact your GP if you experience a rash, itching, persistent pain at the injection site, or worsening neurological symptoms despite treatment If you suspect any side effects from your B12 injections, you can report them through the MHRA Yellow Card scheme (yellowcard.mhra.gov.uk)
2007 Jul;30(7):834-9
For most patients, a weekly B12 shot for the first four weeks rebuilds depleted B12 levels, followed by maintenance shots every two to four weeks
In fact, in January 2019, a Canadian published study from a combination of Canadian Universities including UBC concluded that Low Vitamin B12 and High homocysteine levels remain common in patients with stroke and TIA (Transient Ischaemic Attack) and because these conditions are easily treated and have serious consequences, all patients with stroke/TIA should have their serum B 12 and homocysteine levels measured