What "medicinal" herbs are actually very harmful and should be avoided?

“Herbal medicine” is a very loosely defined concept, not a concrete chemical compound, so this question, as worded, has no meaningful answer.

Some herbal medicines have been proven safe for most people for everyday use. See milk thistle for an example.

Some herbal medicines, on the other hand, have been shown to be unsafe altogether: comfrey, for instance, though perhaps beneficial when applied topically, may be linked to liver and lung damage when taken orally.

Finally, it depends on what your definition of “herbal medicine” is. Do you include aspirin, for example, which is made from the willow tree?
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Medicinal herbs at moderate dosages are quite safe, to the point where they are considered food by the FDA.

Since the FDA is not your babysitter they won’t tell you that your medicinal herbs might have a bad interaction with some other medicine that you are taking that might harm you.

Examples:

if you’re taking a blood thinner like coumadin (warfarin) and also like to take feverfew for your migraines then god (I mean physics) bless you.
if you’re taking antidepressents such as phenelzine and also like to take Saint-John's-wort because it worked for Steve’s (or was it Richards?) depression then god (I mean physics) bless you.
Believe it or not even something easy like aspirin hat can be bought over the counter AND/OR the two big boys above (warfarin & phenelzine) should not be taken with ginseng which I personally believe is a great energy booster but oddly doesn’t mess with a lot of other stuff, anyway don’t do it, otherwise…god (I mean physics) bless you.
Since the FDA is not your babysitter they won’t tell you that your medicinal herbs should not be taken excessively.

Heres another crazy interaction:

If you eat a decent dose of garlic is may interact with aspirin. *mindblown if you do that then god (I mean physics) bless you.
If you’re referring to something more illegal like poppy seeds (im thinking heroin) or magical shrooms (yes I say ‘magical’ because why not, its cute) then just know that their interaction with your system is more like a “dig in the box see whatcha get bud” type of thing. AKA last example:

If you have a predisposition to some mental illness like schizophrenia then just know that you are more likely to get a psychosis while taking these magical shrooms. OR since you opened the box and dug in to see what you get bud, you just might have your mind blown (figuratively) and have some cool insight out the experience.

SO. What does it all mean Lior!?

it means: Don’t worry about your favorite Medicinal herbs being harmful, if you’re taking them at moderate dosages they are quite safe, to the point where they are considered food by the FDA. SO. LIOR MEANS IT ALL NEEDS TO BE checked with your physician before you start introducing new drugs including herbs into your system.