"It's the best stuff in town," the salesman at the window said.
Neither business explained any use other than what the packages say, but Springfield police believe many smoke, ingest or inject the substances, which mimic the effects of methamphetamines, cocaine or ecstasy.
"Which is an illusional psychosis, if you will," said Joe Hahne, a representative of Missouri Recovery Network and executive director of ArchAngel Outreach Ministries.
Hahne works with addicts of all kinds, and has seen what these new legal drugs can do.
"It has been quite extreme, from the things that I have seen, especially with the gentleman we did an intervention with Friday night. His mood swings were from severe depression to sever anger within a matter of minutes," Hahne said.
The powders and crystals often contain mephedrone and another compound known as MDPV, chemicals that are so far legal, even undetectable, in Missouri.
"It is detectable, but the UAs [urinalyses] that we have set in place are not designed to detect the specific chemical," Hahne said.
Although they're legal substances, they could still get you into trouble.
"What the person does while they're on the product is not (legal), so you can't drive a vehicle under the influence of this; you can receive a DWI," said Brown.
Hahne urges people not to experiment just because they're legal, saying the effects can be even more extreme than meth.
"It has to be taken seriously, because it's been targeted to our young adults, not just ones that are commonly using meth or cocaine, but young adults can get hold of this, and there's no way to detect it," Hahne said.
Hahne says people who become addicted to the bath salts or plant foods can't get help to recover easily. He says you have to have a positive drug test to be admitted into most detox programs.
Several states either have placed emergency bans on the substances or are working to ban them. Both businesses in Springfield that a reporter visited declined to comment about their sales.