The scientifific basis for this is the fact for the artificial steroid to not be immediately broken down by the liver, it must fool> the liver.
As a result, it is tougher to be broken down by the liver.
Artificial steroids are described by some as toxic to the liver.
There are reports of liver adenomas and even cancer from the pill, but I’ve never seen one from the pill in 40 years of medicine. There are lots of other causes (hepatitis B, aflotoxins from fungi, from cirrhosis, and most cancers of the liver are metastatic).
I was just pointing out that women use the pill because they think the alternative is worse.
Now, if men could agree to use Natural Family planning, women wouldn’t have to make this type of choice.