A 1 g microdose of fresh magic truffles typically contains about 0.5 to 2 mg of psilocybin, with many batches landing close to 1 mg per gram. This is a rough estimate and not a guarantee.
Potency varies by species or strain, growth conditions, harvest timing, and storage. Psilocybin can degrade with time, heat, light, and humidity, so older or poorly stored truffles often contain less.
The exact amount is only verifiable with lab testing. For a short overview of psilocybin and factors that influence its levels, see this page.
Hope this clarifies.