Lion’s Mane Mushroom: Fruiting Body, Extract Ratios and How to Read the Label

Lion’s Mane (Hericium erinaceus) is an edible mushroom — a white, shaggy, icicle-like species that has been eaten in East Asia for centuries and is now one of the most widely sold mushroom supplements in the UK. It is also one of the most inconsistently made, and two products with near-identical labels can contain very different amounts of actual mushroom.

This guide is about that difference: what the fruiting body is, what an extract ratio means, and which number on a label is worth reading. It does not tell you what Lion’s Mane will do for you — no health claims are authorised for Lion’s Mane under UK or EU law, and JeaKen makes none. What follows is about composition, because composition is the part you can actually verify.

1. Fruiting body or mycelium — the difference that matters most

The mushroom you would recognise is the fruiting body: the part that grows above ground and gets harvested. Mycelium is the root-like network the fungus grows through its substrate before fruiting.

Both appear in supplements, but they are not produced the same way. Most commercial mycelium is grown on a grain substrate — usually rice or oats — and the mycelium grows through and fuses with that grain. At harvest the two cannot be separated, so the grain is milled into the finished powder along with the mycelium.

The consequence is dilution. A capsule of “mycelial biomass” is largely grain starch by weight, with a much smaller fraction of fungal material. Nothing is being hidden — “mycelium” is on the label — but a shopper comparing two products by the milligram figure on the front has no way to see it.

A fruiting body extract does not have this problem: the starting material is harvested mushroom, and there is no substrate carried through.

2. What an extract ratio actually means

Extract ratios such as 10:1 describe concentration. Ten kilograms of dried fruiting body are processed down to one kilogram of finished extract. A 4:1 extract is less concentrated; a 1:1 is not really an extract at all, just dried powder.

This is why the milligram number on the front of a pack can mislead. “5000 mg” on a mushroom supplement usually refers to a dried-mushroom equivalent — the amount of raw material the extract in the capsule was made from — rather than the weight of powder in the capsule. Both numbers are legitimate. They are simply not comparable to each other, and a product that quotes the raw-equivalent figure while a competitor quotes the extract weight will look several times stronger when it may not be.

The ratio is the number that makes the comparison possible, and it is the one most often left off the label entirely.

3. Reading the label: beta-glucans, not “polysaccharides”

Many mushroom products advertise a “total polysaccharides” percentage. It is a weaker number than it looks.

Polysaccharides are a broad class of carbohydrate that includes beta-glucans, which are specific to fungal cell walls, and alpha-glucans — which is what starch is. A product grown on rice or oats carries grain starch into the finished powder, and that starch counts toward a total polysaccharide figure. A high polysaccharide percentage can therefore reflect the substrate rather than the mushroom.

So, in order of usefulness on a label:

• Beta-glucan percentage — the fungal-specific measure. The most informative figure, and the least commonly printed.
• Fruiting body vs mycelium, stated plainly.
• Extract ratio — 10:1, 8:1, 4:1.
• “Total polysaccharides” — treat with caution unless you also know the source material.
• A large milligram number alone — the least informative thing on the pack.

4. Practical points

• Format. Lion’s Mane extract is sold as capsules or loose powder. Powder can be stirred into coffee or a smoothie; capsules avoid the taste, which is mild but noticeable.
• Suitability. Mushroom extracts in vegan capsules are suitable for vegans and vegetarians. Check the capsule shell, since gelatine capsules are still common in this category.
• Cooking. Lion’s Mane is a culinary mushroom in its own right and is sold fresh by some greengrocers and online growers. A supplement is a concentrated extract, not a substitute for food.
• Allergies. Anyone with a known mushroom or mould allergy should avoid mushroom supplements.

Follow the serving size on the label and do not exceed it. Food supplements are not a substitute for a varied and balanced diet and a healthy lifestyle. If you are pregnant, breastfeeding, taking medication or under medical supervision, speak to your doctor or pharmacist before starting any new supplement.