The reason this substance is still available to purchase in the US is the labs, pharmacies, and companies selling the products claim the substance is available for purchase for research only
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Langman CB, Greenbaum LA, Sarwal M, Grimm P, Niaudet P, Deschenes G, Cornelissen E, Morin D, Cochat P, Matossian D, Gaillard S, Bagger MJ, Rioux P (2012) A randomized controlled crossover trial with delayed-release cysteamine bitartrate in nephropathic cystinosis: effectiveness on white blood cell cystine levels and comparison of safety
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