b12 injection absorption rate Vitamin Injections 101 Oral versus intramuscular administration of
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Long-term use of metformin, a drug commonly prescribed for type 2 diabetes, is strongly associated with vitamin B12 deficiency and lower folic acid levels as it can block absorption, which may lead to increased homocysteine levels and risk for cardiovascular disease

Schloss et al

Some practitioners state that you do not need a blood test prior to starting on a programme of vitamin B12 injections stating that symptoms of feeling run down are enough and with the lack of overdose risk, you have nothing to lose

doi: 10.1210/endo.142.12.8522

you can order your own B12 ampoules from Germany, as we all do..Self injecting works out around 1 per injection I have to self inject daily to stop my symptoms from returning If you wanted to order B12 ampoules I could send you the links