10 folks whose past has been studied. 9 have ingested a certain chemical for years. 1 never has. 9 have never used herbs and it’s the same 9 that ingested the chemical. 1 has ingested herbs for years. It’s the same 1 that never ingested the chemical.
The 9 all have a dread disease, the 1 is healthy.
Was it because of the chemical or the herb. I know it’s easy to say, a little bit of both, but that’s not the point. Their are thousands of variables, is the point. Research can be tough, can cost lots of money and take lots of time.