for every potentially harmful/lethal chemical additive, there is an effective natural substitute.
arsenic, lead, and chlorine are all found in nature and are pretty harmful/lethal. Not to mention the many, many toxins and poisons and venoms that ntural creatures create and use every day. Nature does not automatically = good as you are trying to imply.
there are not bottled chemicals in the wild. think about it.
Chemicals don't change simply because they are bottled or not. Ammonia is ammonia whether it is "free" in the nature or in your bottle.
Household ammonia concentrations are going to be between 5 and 15% ammonia, most closer to 5%. If you bought a bottle of ammonia from a chemical supply store, you can get stronger, but that is going to be very atypical. Not that it really matters because unless you know what the concentration is, you add a known amount, let it mix with the tank volume and use your test kit to find out what the concentration is after you've added that known amount. Then you scale up or down as necessary so that you add the same "right" amount to the tank each day, typically 5 ppm is about right.
If you accidentally add too much, you can simply do a water change to dilute out that too much. The bacteria won't like the higher concentration, but they don't instantly die either. Neither will plants. And since this is a fishless cycle, they aren't any fish to harm.
Compare this to adding food or a piece of shimp or prawn to a tank. How much ammonia is that actually going to produce? It is going to vary quite a bit, depending on exactly the mass of stuff you put in, what the temperature is. And, the food or shrimp or prawn isn't going to break down into pure ammonia. If you are so concerned about "other things" in your tank, why would you let that food break down into things other than just ammonia? You are going to have urea, and trimethylamine, and hypoxanthine and I am sure that there are many others in addition to ammonia. These aren't exactly benign chemicals, either, but they aren't tested for in our kits because in general, there shouldn't be much if any of these chemicals in the tank. So, if you are so worried about introducing other chemicals, which method only introduces 1 chemical, and which introduces several?
Also, let me put on my moderator's hat here, and just simply say to everyone: Regarding comments like "maybe its you who needs to learn to read.", please be more respectful of the members of the forum. I am singling this one quote out because I think it is the harshest, but this goes for everyone participating in the entire thread. Everyone keep it civil here or else repirmands will be given out.
Thanks, Bignose