Lion's mane labels: fruiting body, mycelium and polysaccharides

The Morning label gives you three pieces of information: lion's mane at 1,000 mg per serving, fruiting body and mycelium, and polysaccharides at 40%.

Each line answers a different question. The amount tells you the serving weight, the terms for the organism's parts tell you which fungal structures are present, and the percentage describes a broad class of carbohydrates.

What is the difference between fruiting body and mycelium?

The fruiting body is the mushroom you would recognize, the white shaggy thing growing on a tree. The mycelium is the fungal network the mushroom grows out of, and in supplements it is usually grown in a bag on cooked grain rather than on wood. They are the same organism at different stages, and they are not chemically interchangeable. A 2018 review in Behavioural Neurology puts the split plainly: "Hericenones were typically found in the fruiting bodies while erinacines were derived from the mycelia of the mushroom."

Hericenones and erinacines are the two compound families people cite when they talk about lion's mane. The practical consequence is that "which part" is not a purity argument, it is a composition argument. A fruiting-body product and a mycelium product carry different compounds. Our Morning bottle states both parts because both are in it.

Why does it matter what the mycelium grew on?

Because the grain usually comes along with it. Mycelium grown on rice or oats is often dried and milled together with the substrate, so the finished powder contains fungal material plus residual grain. That is not automatically a problem, but it changes what a carbohydrate number means, and it is why labeling rules treat the two parts separately.

The FDA has said so since 1976, in compliance policy guide 585.525, reissued 8 December 1988: "Mushroom mycelium grown in acceptable media is regarded as suitable for food use. Any food in which mushroom mycelium is used should be labeled to state that fact." The same guide adds that labeling "should not suggest or imply that the food contains mushrooms", and gives the example that a mycelium soup should not be sold as mushroom soup. In other words the part used is a labeling fact, not a marketing preference.

Does 40% polysaccharides mean 40% beta-glucans?

No. Polysaccharides are a whole class of long-chain carbohydrates. Beta-glucans are one subgroup inside that class, and they are the subgroup most of the mushroom research is about. Starch is also a polysaccharide, and starch is an alpha-glucan, which means it sits in the broad category and outside the interesting one.

That matters because of how the two numbers get produced. A crude polysaccharide figure usually comes from hot-water extraction, ethanol precipitation, then hydrolysis down to glucose and a glucose measurement. Ethanol precipitation separates things by behavior, not by structure, so grain starch that survives the process gets hydrolyzed into glucose and counted like any other polysaccharide. A beta-glucan figure comes from a different method, which measures total glucan, measures alpha-glucan separately with enzymes, and subtracts one from the other. Only the second one has excluded the starch.

So 40% of 1,000 mg is 400 mg of polysaccharide. It is not 400 mg of beta-glucan, and a label that gives you only the broad figure has not told you the ratio between the two. Polysaccharides at 40% and beta-glucans at 35% are separate measurements, not two names for the same value. The distinction is similar to reading the compound weight on a magnesium bottle as if it were the mineral weight, which you can see in the arithmetic on a magnesium label.

Has anyone tested what is actually in mushroom supplements?

Yes, and the results are worth knowing before you trust any percentage. A 2017 paper in Scientific Reports bought 19 batches of reishi supplements on the US market and analyzed them. Its finding, verbatim: "the measured ingredients of only 5 tested samples (26.3%) were in accordance with their labels, which suggested the quality consistency of G. lucidum dietary supplements in the U.S. market was poor". Starch-like polysaccharides turned up in 13 of the 19. Branched 1,3-beta-D-glucan turned up in 5.

A 2023 paper in Nutrients did the same kind of work on species identity rather than chemistry, sequencing 19 mushroom supplements sold in Italy and finding labeled-species mismatches among them.

Neither study is a survey of commercial lion's mane products. One concerns reishi and the other includes several mushroom species. Their results cannot tell you the contents of a specific lion's mane supplement, but they show why a printed percentage should be considered alongside the test method and the material tested.

What does the research on lion's mane actually measure?

Two recent trials in healthy adults show limited and mixed results.

Docherty and colleagues, in Nutrients in 2023, gave 41 healthy adults aged 18 to 45 either 1.8 g a day of a mushroom preparation or placebo. After a single dose, the supplement group was faster on the Stroop task at 60 minutes, p = 0.005. In the same session their accuracy on immediate word recall was lower, p = 0.013. After 28 days, subjective stress showed a trend that did not reach significance, p = 0.051. The authors call it a pilot study and write that "null and limited negative findings were also observed".

Surendran and colleagues, in Frontiers in Nutrition in 2025, gave 18 healthy adults a single 3 g dose of a 10:1 fruiting-body extract in a crossover design. Their result sentence: "The results showed no significant effect of the H. erinaceus fruiting body extract for composite measures of global cognitive function and mood." On individual tasks, pegboard performance improved at 90 minutes while Flanker and Trail Making B got worse.

These were groups of eighteen and forty-one people, studied for one dose or 28 days, with outcomes moving in mixed directions. The label claim stays within that evidence boundary: "Supports focus and mental clarity."

How much lion's mane, and when?

Our serving is two vegan capsules, 1,000 mg of lion's mane, 30 servings in the bottle. We suggest it with the first coffee, because a bottle attached to a habit you already have gets opened. In the Wake & Wind app, the focus timer exists for the same reason.

Trial doses ran from 1,800 mg to 3,200 mg a day, above the 1,000 mg serving in the Morning bottle. The serving should be read as the amount in this product, not as a match to either trial dose.

Four lines to read on any mushroom label

Which part of the organism is named, and whether the words fruiting body or mycelium appear at all. How many milligrams per serving, and whether that is the mushroom or a whole blend. Whether a percentage says polysaccharides or beta-glucans, since only one of those has ruled out starch. And whether an extract ratio like 8:1 is given, because an extract weight and a raw powder weight are not the same milligram.

What our own label says, and what it does not

Our most recent published lot certificate for the Morning bottle measured polysaccharides at 401.78 mg against 400 mg declared, which is the 40% figure holding up. Content matched the declaration. Ask us for the latest certificate and we will send it.

Here is what we cannot tell you. Our beta-glucan content: not measured. We have a polysaccharide measurement, not a beta-glucan measurement, so by our own argument above we do not know the ratio. The substrate our mycelium portion was grown on: not recorded. The name of the laboratory is not shown, since the documents come on our supplier's letterhead. The bottles are made in GMP-certified US facilities, which is a fact about the facility and not a certificate on the product.

We would rather print four dashes than a number we did not measure.

The Evening bottle is the other half, both bottles are the set, and if you want the part of this that has actually been measured with polysomnography, it is in what happens in the evening.