I have read reports of people saying that Lophophora Williamsii v. Caespitosa has the same potency as your regular L. Williamsii. That being said, people usually eat any where from five to 15 buttons for a dose. Personally, I would recommend using a Trichocereus for your adventures with mescalito. They grow quickly and are quite sustainable. If you find a nice clone, you can root it and it will grow at least one dose a year. Peyote takes 5-10 years plus to fully acquire it's potency.
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But suddenly you're ripped into being alive. And life is pain, and life is suffering, and life is horror, but my god you are alive and it is spectacular!