Finding a Reliable Source for Research

I recently started working on an important project to study protein interactions in cells, and for this I need specific biochemical reagents and antibodies. While trying to find reliable sources, I came across many options, but the quality of the products leaves much to be desired. Perhaps some of you have encountered a similar problem and can recommend trusted suppliers of scientific research products? I particularly need high quality biomolecules and antibodies that meet the most stringent standards. Your help will be extremely useful for my experiments and further discoveries in the field of biomedical research.