DMAA is no longer legal to manufacture so this won't be a problem much longer. Once the DMAA/geranium-containing products on shelves sell out, they're gone for good. I work in the dietary supplement industry so I try to be up on these things
I'm always happy to answer any questions and there is actually a website your college athlete can use to ask someone to review to see if the ingredient label lists any banned ingredients.
Most products kids use don't have banned ingredients. DMAA was by far the most prevalent and the fact that it was banned for competition was dumb in the first place. It is perfectly safe (at least, has the safety level of caffeine more or less -- way too much could be bad, especially if you have a heart condition). The reason it is being made illegal to manufacture now is not because of its safety, but rather the fact that nobody can prove it comes from a plant. The industry is abuzz about this.
As far as the NSF thing, NSF supplements should be fine. My perspective on it, though, is that the approval process prices out the "little guy" so if you're interested in purchasing from smaller companies they'll never have that NSF stamp but the reputable ones will have the GMP quality control certification and it is fairly easy to find out if the ingredients are legal yourself. In my experience, both the best and the worst formulated supplements come from small companies -- big ones typically do not have products that are truly useful beyond their protein products, and the pricing on these things is not always competitive...it's all unnecessarily complicated honestly.
It can be much easier to just buy as few dietary supplements as possible. I think most young men's diets could use supplemental protein and there is a "fun" factor in buying a pre-workout supplement, but with the ban of DMAA most do little better than a cup of coffee or caffeine tablet would do.