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why do i feel worse after b12 injections Vitamin B12: Symptoms, Dosage & Toxicity Risks B12 Injection – When Is
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However, a small study from 2021 argues that differences in bioavailability between the two forms are negligible and that cyanocobalamin may maintain serum levels better

In the evaluation of RCT quality, 3 studies scored two points, indicating low-quality study and high risk of bias
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Methylmalonic acid, vitamin B12, renal function, and risk of all-cause mortality in the general population: Results from the prospective Lifelines-MINUTHE study
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doi: 10.1210/en.2006-0807
