It works gradually
The dose and duration of treatment will depend on what you are being treated for
The better question is which one, or which combination, matches what you are trying to achieve
For researchers who also produce content, the affiliate program economics commission rate and cookie duration matter
Here's why B12 doesn't directly cause weight gain: Water-Soluble Nature : Vitamin B12 is a water-soluble vitamin
NHS approach to B12 deficiency: NICE Clinical Knowledge Summaries recommend investigating B12 deficiency in patients presenting with macrocytic anaemia, unexplained neurological symptoms, or risk factors including pernicious anaemia, gastrectomy, malabsorption disorders, metformin use, proton pump inhibitors, or nitrous oxide exposure