Regardless, my experience was that its only value is the placebo effect. If a substance actually does anything real, and there is potential for a pharmaceutical company to patent and profit from it, then you can generally rest assured that it will be scheduled to require a doctor's prescription. For just about everything, the over-the-counter options consist of vitamins and quackery. So either blatantly break the law, or don't.
As an aside, what is the point of taking a serious nootropic for software development? Typically, a coder's problem isn't failure to get into a groove once they have uninterrupted time. The typical problem is not having uninterrupted time in the first place. Like most people here, probably, I work in an open floor plan environment. I'm subject to constant "drive-by" interruptions that could have been handled better via email, and a neverending roar all around me as colleagues literally scream at each other about Reddit memes or video games or the latest superhero movie.
Do you have a drug that would allow me to completely shut off my hearing, peripheral vision, and other sensory input? So that I can work without having to blast music through $300 noise-canceling headphones (which itself impairs focus, but is the lesser of all evils)? If so, then I would gladly break the law to find a pharmaceutical escape from contemporary office plans that sacrifice productivity for the ability to squeeze headcount into the smallest possible space.