Supplement quality

I just wanted to know what the best quality supp. companies are. First of all I know that Biotest is the best, and thats what I buy but this month I was short on money because I just changed jobs, so I bought some protein in a 5 lb bucket for 27.00. Anyway this same company has meal replacment packs for cheap also and I just want to know if there have been any studies to see if the content is what is on the label. Hopefully I will not have to buy it again because it taste pretty bad. Nothing is as good as Grow.