Vitamin B12 is important for red blood cell production, growth, and cell reproduction
Microorganisms 10(4):784 Cai X, Wen J-S, Long H, Ren W, Zhang X, Huang A-Y et al (2022) The probiotic effects, dose, and duration of lactic acid bacteria on disease resistance in Litopenaeus vannamei
These include nausea, diarrhoea, vomiting, constipation, abdominal pain, and dyspepsia (classified as very common in the SmPC)
They are chemically equivalent to branded products but manufactured in specialized compounding facilities
So, injections are a more direct way to make sure your body gets the B12 it needs, while tablets might not work as efficiently because they have to go through your stomach and intestines first
Days 5-14: Gradual Improvement Receptor desensitization begins