However it is true that drugs like heroin (when pure) are quite safe overall - aside from the respiratory depresssion overdose scenario.
I haven't checked their sources, though.
In general taking excessive amounts triggers vomiting, similar to when you eat too many psilocybin mushrooms (well, some say it’s ideal to vomit shroom-wise, but I’m not a fan). So mitragyna speciosa is incredibly safe.
Unfortunately Wikipedia’s treatment of the topic could be improved, but there is very little existing literature out there. I read one review study I was pretty happy with but I’m not on a laptop so i can’t go dig up the link unfortunately
They spend billions on developing and promoting these, and they can't figure out the side effects for a specific drug? Maybe they should spend just a little bit more.
Interestingly, it has a mix of opioid antagonists and agonists. I’m not sure if that specifically is why tolerance doesn’t build aggressively, or if it’s some other MoA like nmda receptor antagonism
We see huge harm from legal opioids which are widely mis-prescribed. They cause addiction and fail to treat the pain for which they are prescribed.
So I’d be careful with “only $x a month” as an argument.
Anyway if it is addictive it’s hard to imagine it being more addictive than oxycodone and that is totally legal and aggressively pushed by companies that know exactly how addictive it is, so mostly this goes back to the standard government motto of only making drugs legal if large companies can make a huge profit off it. Anything that can be easily grown by average consumers (like weed) doesn’t meet that requirement and so tends to be illegal.
However, compared to the harm caused by illicit opioids (or even prescription opioids) doesn’t this seem like a low priority?
So someone is spending $100 or $200 per month on their kratom. They aren’t committing crimes to pay for it, they aren’t overdosing and dying in the street and they aren’t getting diseases by sharing needles.
It doesn’t seem like a major health cocern.
Kind of like tobacco without the second hand smoke or lung cancer. Sure it would be better if people didn’t do it, but that’s true of a lot of things.