I think you're missing the point of fertilizer.
Chemical or not, fertilizer contains nitrogen, phosphate, and potassium.
The plant takes those in and combines them in different ways into organic molecules and salts that are part of the plant. For example, P is a MAJOR part of DNA and RNA. All living cells contain genetic material, and there's where your P goes when you fertilize.
The only difference between chemical and organic ferts is the form the N, P, and K take. For example, fertilize with manure, and the DNA from the plant the cow ate, ruminated, and shat out is partially broken down but still present, and needs soil bacteria to break it down further into a form of P that the plant can absorb through its roots.
Now unless your fetilizer contains like PCBs or something, stop stressin.