really the only battle ongoing at all is "is a chemically identical ingredient that is lab made the same as the compound coming from a natural source and extracted". Even that isn't much of a battle. The FDA gets to define it, everyone else gets to suck it up. The FDA has to approve of anything you sell as meant to be ingested. With supplements it's an implied approval (with them assuming you source it from nature) until they ask you to show that the ingredient is available in nature.
That was the whole reason the DSHEA was created. Before that there was literally no true legal way to sell supplements. That doesn't mean anyone selling them was arrested, but they were not legal for human consumption as there were no FDA rules covering them.
That's not really the argument at this point, in fact the FDA has sort of changed their verbiage over the past year or two in that regard.
Industry organizations were keen to point out that if chemically identical ingredients were adulterated per se, then even thing as simple as Vitamin C products would become exponentially more expensive.
The arguments back and forth now from the FDA are related more to
quantity. And it's an important argument.
The burden of proof for 'safety' in supplement products is very low, because the operating assumption is that hey, anything in a dietary supplement is something that has already been consumed by humans.
Where that gets hazy is when you have ingredients that have technically been consumed by humans safely, but at mere fractions of the dose being used in supplements.
The exact natural quantity of DMAA in Geranium is still up for debate so I'll point back to BMPEA/Acacia
It's unlikely any human has ever even consumed 1 mg of BMPEA from natural acacia rigidula.
Supplements contained anywhere from 20 to 100mg of BMPEA per serving.
So the FDAs position is how do we know this is safe if we're not relying on history of human consumption and we don't want to bog the industry down in having to spend millions on safety studies before going to market.
Writing laws and regulations is extremely difficult. Getting them to serve their intended purpose (make sure there's a decent expectation of safety) without having unintended consequences (stifling innovation and blocking otherwise great ingredients from the market) is tough.
DSHEA needs a significant refresh, in 1994 the industry was much smaller, large manufacturers and suppliers were much less sophisticated, and the amount of money going into research of synthesis and extraction techniques was a mere fraction of what it is now. The industry has come a long way in the past 20+ years.
At the end of the day though, every company that persists in flaunting the law makes it that much harder for industry associations to push for a pro-industry agenda at the FDA. It's short-sighted and driven by greed at the expense of the future of the industry.