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The search function will answer your questions for you very thoroughly. To give you a quick answer: mimosa is the tried and true method with many viable teks readily available. The downside of this is that mimosa is becoming harder and harder to come by these days. Upside of acacia confusa is that you can find it online with little problems. Downside is that people are still working out the kinks with teks.
As for potency, I don't know off the top of my head but I know you can easily find the answers by using the search function, google, or erowid.
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All I know is something like a bird within her sang...
The best way really would be to find someone outside the US, (assuming you live in the US and you can't find Mimosa easily), who can order some MHRB and ship it to you personally. Of course there is still a risk that it will be stopped by customs, but they are mainly looking for large amounts being imported for sale, not say consumer level amounts like 100-500 grams.
Mimosa is the best option because it contains, as far as I know, the highest amount of alkaloids on average. Plus it takes less work because it's not a very fatty plant, easy to extract from. And as the above poster mentioned there are many teks for it.
-------------------- "The issue is not whether people are 'good enough' for a particular type of society; rather it is a matter of developing the kind of social institutions that are most conducive to expanding the potentialities we have for intelligence, grace, sociability and freedom." - Paul Goodman (1964)