A team of scientists, from the University of Bath's Department of Chemistry and Institute for Sustainability have found a way to create two of the world's most common painkillers, paracetamol and ibuprofen, out of a compound found in pine trees, one which is also a waste product from the paper industry.
It’s very unlikely that you would experience any problems. Drug synthesis such as this involves multiple reaction steps, precipitations, washes, and filtrations to produce the final purified active compound. If they’re creating acetaminophen, that final product is going to be pretty much pure acetaminophen with only trace amounts of impurities. Not enough to cause issues.
You don’t much understand these kinds of issues.