Good luck with you quest.
Nevertheless, as I pointed out previously there are other issues beyond tuning the productive process of your product that you have to think about, namely:
-In your country who is the governing body responsible for licensing and approval of vitamin supplements? It should be something similar to FDA in US;
-Stability and replicability of your production process
-Side-effects: Unless this is already a product in the market and you are replicating all the steps, you'll have to prove that your product is safe;
-Interactions with other suplements/medicines;
-restrictions for use-any particular age should be restricted to use? Any persons with a particular disease or disability?pregnant women? children?
-Stability data-to stablish your storage conditions (do you need cold storage, etc.?) and validity date.
These are just some of the issues that crossed my mind and for sure there must be a lot otehrs, but I am not an expert in regulatory affairs. Eventually some of these are not applicable in your country, but you have to investigate.
Again, if you are just making a product that is already in the market, then most of this work you can get it from literature orthe competition.
If you are starting from square one, then prepare yourself since there is a big road ahead (and hopefully a pot of gold in the end of it)