how much vitamin b12 in an injection Methylcobalamin 10,000mcg injectable, 10mL (lyophilized) Vitamin B12 Injection - We

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Czechia Greater than 99.8 % purity confirmed by COA Assay content verified at 55.1 mg Endotoxin level below 0.001 EU/mg No detectable heavy metals or microbial contamination NNMT-related research compound for controlled laboratory studies For research use only not for human or veterinary use For laboratory research only

That distinction is the whole article

I tried oral methylcobalamin twice and each time I had very bad reactions

I am on my 4th order

[4] The most frequently reported adverse effects include transient gastrointestinal discomfort-nausea, vomiting, abdominal cramps, or diarrhea-particularly when large doses are delivered rapidly