If you carry them with you while going through security, you're just asking to be strip searched and questioned.
Of course, all of the supplements etc I've traveled with have been very much legal and mainstream enough (e.g. creatine, magnesium), in case security do get suspicious, but it has not once been an issue.
Be very careful about this. It is a good way to get your money "stolen" through Civil Asset Forfeiture:
https://en.wikipedia.org/wiki/Civil_forfeiture_in_the_United...
> A 2020 study found that the median cash forfeiture in 21 states which track such data was $1,300
It doesn't have to be a lot of cash, and in fact smaller amounts are more likely to be taken so that there is less of a fight to try to get it back.