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This brand, along with most other US sourced products (including Paul Stamet's brand) contains more biomass (the grain substrate on which mushroom grows) than the mushroom itself. For instance, one of the FAQ on their site states it has 2g of starch per 2g serving!

I am looking for a good lion's mane supplement in the US too but I haven't found a good one yet.

Is there a lab that verifies this?

The supplement industry is in sorry state. It hurts to see people throwing away money on useless products on Amazon.

Real Mushrooms is the only mushroom supplier I trust. (No affiliation, you can find discussions about them on Reddit)

10 ounces for $87. That’s crazy.

Thanks!