Topic: How can I package and manufacture my own dietary supplement?

I can find all the individual ingredients on alibaba.com, but I'm looking for a way to do the following in the most cost-efficient way possible:

(1) Mix all the ingredients in specified proportions

(2) Package the supplement in containers for individual consumption and add my brand.

(3) Ship wholesale to the United States

It seems like this would involve more than one manufacturing company.  If so, how would I setup the cooperation between more than one manufacturers?

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nutritional supplement manufacturers