I’ve always used Nutricost for my supplements (caffeine, whey, creatine, beta-alanine, taurine), but recently I’ve been trying to source everything from NSF-certified suppliers. However, it has been difficult to find NSF-certified pure ingredients instead of proprietary blends, especially for caffeine. I understand the risks associated with pure caffeine powder but have preferred using tablets and capsules. Given that, how much contamination risk am I exposing myself to by continuing to use Nutricost, No-Doz, or similar products?
Could you do it as a part of a gel, block, or drink?
Also a quick google shows that Nutricost Caffeine Capsules are NSF (or at least "made in an NSF facility).
You can see that under “Product Details”: