B12 Injection. The same compositions?

Dear , u are right ,..but this question ,  u cannot ask to doctor still I want to clear ur doubt Second thing , normal t shirt and u s polo t shirt , both are t shirt but price difference is huge same like  that , there is change in base of component , everything varies with company brand , as some company invent the drug then manufacturing cost is different , some company they only manufacture taking help of other innovated company formula . so its totally depend up on formula ,molecule so as u cannot ask the garments company same u should not ask other company too. Law should be equal , same mobile features but price is different but people are not complaining  iphones ,samsung , mi  ...I think u got my text. Dont  think more