The FDA doesn’t “allow” snake-oil supplements. They have no authority over supplements.
They in fact do have a lot of requirements for supplements and their labeling, but do not require (in fact forbid) any claims that the supplements should be used to treat or cure any disease.
https://www.fda.gov/food/dietary-supplements-guidance-docume...
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They in fact do have a lot of requirements for supplements and their labeling, but do not require (in fact forbid) any claims that the supplements should be used to treat or cure any disease.
https://www.fda.gov/food/dietary-supplements-guidance-docume...