It wouldn't even cost much more than the supplements. However, the amount of time you would wind up using to prepare food would probably cost you your job. The problem is that using some commercial supplements can turn out to be counter-productive. Let me give you some examples. First, there are the protein powders containing soy powder.
Vegetables are a source of incomplete protein.
What soy powder does, in many cases, is give you gas. Second, there are powders that are simply frauds. A chemist in Honolulu analyzed one of the more popular brands. Another supplement is such a fraud that the Attorney General of one State has apparently already gotten after the people promoting it. The problem here is that if I explained why it is a fraud anyone with two brain cells to rub together would recognize the company and its advertising.