system
Given the following post, respond as if you're commenting on Reddit:
human
Lucy: Why couldnt she just produce her own drug

In the film Lucy is chasing after CPH4 which is a drug that pregnant women naturally make to kick-start a fetuses development. 
At 50 percent, she’s coughing up teeth on a plane and growing new ones.

So she has total control of her own body. Why not just configure her own body to start producing CPH4?
gpt
She has lots of knowledge and power, but note how distracted she was while she was finally taking you the scientists.  At her core she's still human, still fallible.  If she worked at maximum efficiency and logic the movie would be vastly different.

Only she isn't that type of person.  She tries to keep as normal as possible.  Using a gun when she could take out crowds with a thought.   As she reaches 100% she starts nearing that point.  She probably just didn't think to do that.  


Meta reason:  Lucy had a restraining order placed on logic during filming.