★★☆Single study — solid evidence, such as one good trial or a large observational dataset, but not replicated at the top tier.
You are buying mushroom grown on oats, in unknown proportion
One US maker describes its own powder, in a peer-reviewed paper, as mycelium and fruiting body cultured on oats. How much leftover grain is in it goes unreported.
What the study found
The powder is grown on oats, and nobody reports how much is oat
The maker of one US lion's mane powder describes its own product, in a peer-reviewed paper, as mycelium and fruiting body cultured on oats. How much of the finished powder is leftover grain goes unreported, as does the content of any marker compound.
The caveat · No independent lab has assayed one
This paper set out to test safety, not to measure composition, so the oat description is an incidental disclosure rather than a finding. No independent laboratory has ever assayed a commercial lion's mane product and published the result.