Take a lion's mane capsule with breakfast and, an hour later, nothing feels different. That is the honest starting point, and it is also the interesting one, because something did happen. A handful of small molecules crossed from your gut into your blood, some of them reached your brain, and a signal went out. The rest is a supply question: whether the brain has the materials and the energy to do anything with that signal.

This article follows the route. It starts at the gut, walks the cable that connects the gut to the brain, and ends at the place where new connections between neurons are actually built. If you have read Inside the mushroom, think of this as the lion's mane chapter, told slowly.

It also arrives somewhere practical. By the end you will see why we recommend taking lion's mane 8:1 with DHA and benfotiamine, every day with a meal, and judging the three together after eight to twelve weeks rather than after a morning. The stack is not three random supplements in a row. Each one supplies something the other two cannot, and all three converge on the same job site. Here is the short version, and then the biology behind it.

The stack in one paragraph

Lion's mane supplies the signal. Its hericenones prompt the brain to make its own nerve growth factor, the instruction to grow, repair and refine circuits, and the mushroom also contributes uridine, one of the raw materials a synapse is made of. DHA supplies the material itself, the fat that forms the membrane of every new connection. Benfotiamine supplies the power, a well-absorbed form of vitamin B1 that the enzymes burning glucose into energy depend on. Signal, materials, power. Take away any one and the construction site stalls.

The cable: the vagus nerve

Everyone says "gut-brain axis" now. The vagus nerve is the actual cable. It runs from the brainstem to nearly every organ in your trunk, and roughly eighty percent of its fibres carry information upward, from the gut to the brain. The gut talks far more than it listens [1].

The line is fast. In 2018, researchers showed that specialized cells in the gut lining, which they named neuropod cells, form true synapses onto vagal fibres, so the brain registers what is in the gut within milliseconds rather than hours [2]. Gut microbes plug into the same line. The short-chain fatty acids they make by fermenting fibre activate vagal endings [3], and in mice, cutting the vagus abolished the calming effect of a probiotic strain [4]. Traffic runs down the cable too: descending vagal fibres release acetylcholine onto immune cells to quiet inflammatory signalling, a loop immunologists call the inflammatory reflex [5].

Vagal tone, the responsiveness of this cable, can be estimated from heart-rate variability, and it tracks with emotional regulation and sustained attention in the general population. It is also trainable. Slow breathing at around six breaths a minute, cold water on the face, humming, and regular exercise all raise it, and they cost nothing.

Where does lion's mane come in? At both ends of the cable. The vagus is a sensory nerve first, and sensory neurons are the classic cells that respond to nerve growth factor, which supports their survival and repair [6]. The same is true of the roughly five hundred million neurons of the enteric nervous system embedded in the gut wall [7]. And at the gut end, lion's mane beta-glucans are fermented into butyrate and other short-chain fatty acids, the very signals that vagal endings and neuropod cells respond to [3].

The signal: hericenones and nerve growth factor

Nerve growth factor, NGF, is the protein neurons use to survive, grow and refine their connections. You cannot swallow it: NGF crosses the blood-brain barrier poorly [8]. What you can do is prompt the brain to make its own.

That is what the hericenones in the lion's mane fruiting body do in cell studies: they stimulate NGF synthesis [9] [10]. They are small and fat-soluble, so taken with a meal that contains some fat they are absorbed, and they can reach the brain, where the signal is produced locally, on site. It helps to know that hericenones are the alcohol-soluble fraction of the mushroom. A hot-water extract leaves most of them behind, which is why the stack is built on the dual extract, our lion's mane 8:1, and not on a 1:1. We told that story in Mushrooms: how and why are they extracted?.

NGF is also the signal that supports the cells that lay down myelin, the insulation that sets the timing and speed of nerve signalling, at least in animal work [11]. That fits the one acute human finding with lion's mane: in a small placebo-controlled study of healthy young adults, a single dose sped up performance on a cognitive processing task, and 28 days of use trended toward lower self-reported stress [12]. The word to hold onto is signal. NGF is an instruction to build. It is not the building.

The materials: the Kennedy pathway

A new synapse is made of membrane, and most of that membrane is a fat called phosphatidylcholine. The brain builds it through a route called the Kennedy pathway, which needs three precursors present at the same time: uridine, which is activated into the carrier molecule CDP-choline; choline itself; and DHA, the omega-3 fat that forms the tails of the membrane [13].

This is not a theory drawn on a whiteboard. In the classic MIT experiments, gerbils given uridine together with DHA by mouth made more synaptic proteins and more brain phospholipids than either nutrient produced alone [14] [15]. The brain even has a dedicated doorway for DHA: a transporter at the blood-brain barrier, MFSD2A, imports it in a specific carrier form [16].

This is where the second piece of the stack earns its place. Lion's mane contributes uridine alongside the hericenones, and choline comes easily from eggs and many whole foods, but DHA has to be supplied deliberately. Take it as fish oil in its natural triglyceride form, which is absorbed better than the ethyl-ester form, especially with a fatty meal [17]. That same fatty meal is the one that carries the hericenones in, which is why we say take the whole stack with food.

The power: thiamine and acetylcholine

Building membrane costs energy, and the energy comes from glucose burned into ATP. The enzymes that do that burning need thiamine, vitamin B1, in its active form, thiamine pyrophosphate [18]. The same cofactor gates the production of acetyl-CoA, and acetyl-CoA plus choline is how the body makes acetylcholine, which happens to be the vagus nerve's own transmitter and the chemistry of attention. No thiamine, no acetyl group, no acetylcholine.

This is the third piece of the stack, and the reason we name benfotiamine rather than plain thiamine. Ordinary thiamine salts are capped by a saturable transporter in the gut wall; benfotiamine is a fat-soluble form that slips through and raises blood and tissue thiamine several times more effectively [19]. It also absorbs with fat, like the other two.

DHA does double duty here. Membranes and myelin are rich in it, it sets the fluidity of the membranes that ion channels and receptors sit in, and in the gut the molecules made from it, resolvins and protectins, help switch inflammation off once it has done its job [20].

Why we stack them

Put the three on one map. Lion's mane 8:1 supplies the growth signal and contributes uridine. DHA supplies the material that becomes membrane. Benfotiamine supplies the energy to run the construction and to recycle the nucleotides, uridine among them. Signal without materials builds nothing. Materials without energy sit in the yard. That is why we recommend the three together rather than any one alone.

It is worth being plain about the evidence. No trial has tested this combination as a set, so what stands behind it is the mechanism above, the individual studies cited along the way, and the experience of people who use it. What the mechanism does explain is why lion's mane is best judged as part of a fed, nourished system rather than as a switch you flip.

How to take the stack

Take the three together, with a meal that contains some fat, because hericenones, DHA and benfotiamine all absorb with fat. Take them every day, and judge the stack on an eight to twelve week horizon, because membrane remodelling and NGF-driven refinement are slow biology. Give the cable some attention too: a few minutes of slow breathing does more for vagal tone than any capsule.

For the lion's mane, choose the dual extract: lion's mane 8:1 capsules, 2,800 mg QCE per capsule, which is the one that carries the hericenones. If beta-glucans for the gut end of the cable are your only aim, the hot-water extracts, lion's mane 1:1 capsules and lion's mane 1:1 powder, are made for that. All three are licensed by Health Canada as a source of fungal polysaccharides with immunomodulating properties, and that is the claim we make for them. Everything above is the biology behind why we built them the way we did, and why we take them the way we do.

References

1. Bonaz B, Bazin T, Pellissier S. The vagus nerve at the interface of the microbiota-gut-brain axis. Frontiers in Neuroscience. 2018;12:49. [Review] PubMed
2. Kaelberer MM, Buchanan KL, Klein ME, et al. A gut-brain neural circuit for nutrient sensory transduction. Science. 2018;361(6408):eaat5236. [Preclinical, mouse] PubMed
3. Dalile B, Van Oudenhove L, Vervliet B, Verbeke K. The role of short-chain fatty acids in microbiota-gut-brain communication. Nature Reviews Gastroenterology and Hepatology. 2019;16(8):461-478. [Review] PubMed
4. Bravo JA, Forsythe P, Chew MV, et al. Ingestion of Lactobacillus strain regulates emotional behavior and central GABA receptor expression in a mouse via the vagus nerve. Proceedings of the National Academy of Sciences. 2011;108(38):16050-16055. [Preclinical, mouse] PubMed
5. Tracey KJ. The inflammatory reflex. Nature. 2002;420(6917):853-859. [Review] PubMed
6. Levi-Montalcini R. The nerve growth factor 35 years later. Science. 1987;237(4819):1154-1162. [Review] PubMed
7. Furness JB. The enteric nervous system and neurogastroenterology. Nature Reviews Gastroenterology and Hepatology. 2012;9(5):286-294. [Review] PubMed
8. Poduslo JF, Curran GL. Permeability at the blood-brain and blood-nerve barriers of the neurotrophic factors: NGF, CNTF, NT-3, BDNF. Molecular Brain Research. 1996;36(2):280-286. [Preclinical] PubMed
9. Kawagishi H, Ando M, Sakamoto H, et al. Hericenones C, D and E, stimulators of nerve growth factor (NGF)-synthesis, from the mushroom Hericium erinaceum. Tetrahedron Letters. 1991;32(35):4561-4564. [Preclinical] DOI
10. Mori K, Obara Y, Hirota M, et al. Nerve growth factor-inducing activity of Hericium erinaceus in 1321N1 human astrocytoma cells. Biological and Pharmaceutical Bulletin. 2008;31(9):1727-1732. [Preclinical, human cells] PubMed
11. Chan JR, Watkins TA, Cosgaya JM, et al. NGF controls axonal receptivity to myelination by Schwann cells or oligodendrocytes. Neuron. 2004;43(2):183-191. [Preclinical] PubMed
12. Docherty S, Doughty FL, Smith EF. The acute and chronic effects of lion's mane mushroom supplementation on cognitive function, stress and mood in young adults: a double-blind, parallel groups, pilot study. Nutrients. 2023;15(22):4842. [Human RCT] PubMed
13. Wurtman RJ, Cansev M, Sakamoto T, Ulus I. Nutritional modifiers of aging brain function: use of uridine and other phosphatide precursors to increase formation of brain synapses. Nutrition Reviews. 2010;68(Suppl 2):S88-S94. [Review] PubMed
14. Wurtman RJ, Ulus IH, Cansev M, Watkins CJ, Wang L, Marzloff G. Synaptic proteins and phospholipids are increased in gerbil brain by administering uridine plus docosahexaenoic acid orally. Brain Research. 2006;1088(1):83-92. [Preclinical, gerbil] PubMed
15. Cansev M, Wurtman RJ. Chronic administration of docosahexaenoic acid or eicosapentaenoic acid, but not arachidonic acid, alone or in combination with uridine, increases brain phosphatide and synaptic protein levels in gerbils. Neuroscience. 2007;148(2):421-431. [Preclinical, gerbil] PubMed
16. Nguyen LN, Ma D, Shui G, et al. Mfsd2a is a transporter for the essential omega-3 fatty acid docosahexaenoic acid. Nature. 2014;509(7501):503-506. [Preclinical, mouse] PubMed
17. Dyerberg J, Madsen P, Moller JM, Aardestrup I, Schmidt EB. Bioavailability of marine n-3 fatty acid formulations. Prostaglandins, Leukotrienes and Essential Fatty Acids. 2010;83(3):137-141. [Human] PubMed
18. Manzetti S, Zhang J, van der Spoel D. Thiamin function, metabolism, uptake, and transport. Biochemistry. 2014;53(5):821-835. [Review] PubMed
19. Loew D. Pharmacokinetics of thiamine derivatives especially of benfotiamine. International Journal of Clinical Pharmacology and Therapeutics. 1996;34(2):47-50. [Human] PubMed
20. Bazan NG. Neuroprotectin D1 (NPD1): a DHA-derived mediator that protects brain and retina against cell injury-induced oxidative stress. Brain Pathology. 2005;15(2):159-166. [Review] PubMed

Disclaimer

This article is for education only and is not medical advice. Purana products are natural health products licensed by Health Canada; they are not intended to diagnose, treat, cure, or prevent any disease. Talk with your healthcare practitioner before starting any supplement, especially if you are pregnant or breastfeeding, taking medication, or managing a health condition.