For someone who hasn't used the amounts of illicit drugs you have kratom might have an effect.
People can't even decide what it does. One says it's a stimulant, another says it helps them sleep and "feels like an opiate".
30g , even 3-4x a day does nothing for me (aside from vomit, unless I pack the big caps full and take 40-50 ofbthem.) No matter what strain or brand.