Can lion's mane help nerve damage?

Four kinds of nerve damage, each with its cause and its fix: compressive, metabolic, traumatic and toxic, and why help means something different in each column

Can lion's mane help nerve damage is a question that cannot be answered until nerve damage is sorted, because a clinician sorts it into four kinds by cause and the thing that helps each kind is the thing that addresses its cause, so the honest page draws the table first and looks for the mushroom in it second. The first kind is compressive, the commonest in lifters by a distance: a nerve squeezed by the tissue around it, the ulnar nerve behind the elbow in bent-elbow positions under load or at the wrist on a bar, the median nerve in the carpal tunnel under wrist extension, the lateral femoral cutaneous nerve under a tight belt, a nerve root at the spine against a disc. Its cause is pressure and its fix is removing the pressure: changing the position, reducing the load and repetition on the offending movement, correcting the technique, splinting a wrist at night, and when symptoms persist or weakness appears, decompression surgery, after which the nerve recovers over weeks to months once the pressure is gone. The second kind is metabolic, the commonest in the population as a whole: the peripheral neuropathy of diabetes, where years of high glucose damage the small nerves of the feet and hands; of vitamin B12 deficiency, where the nerve's insulating sheath degrades and tingling and numbness follow, in vegans, older adults and metformin users; and of thyroid disease. Its cause is the metabolic state and its fix is correcting it: glucose control, which slows and can partly reverse diabetic nerve damage, B12 replacement, which reverses the deficiency neuropathy over months if caught early, and thyroid treatment. The third kind is traumatic: a nerve cut, crushed or stretched in an injury, a laceration, a fracture, a dislocation, a bar dropped on a forearm. Its cause is the event and its fix is surgical repair where the nerve is cut, aligning the ends so regrowing axons find the path, then time, since axons regrow at about a millimetre a day, and rehabilitation to keep the joints and muscles the nerve will reach from stiffening and wasting meanwhile. The fourth kind is toxic: nerve damage from an agent, alcohol in chronic excess, chemotherapy drugs, some antibiotics and other medicines. Its cause is the agent and its fix is stopping or changing it, with recovery depending on how long the exposure ran. Four kinds, four causes, four cause-directed fixes, and the word help means a different intervention in every column, which is why the question as asked has no single answer and why a person with nerve symptoms needs the kind identified by a clinician before anything else is decided.

Looking for the mushroom in the table: rodent crush models, cell-culture nerve growth factor, no human study of any kind of nerve damage, no claim, and what a person with nerve symptoms actually does

With the table drawn, lion's mane can be looked for in it, and it appears in no column. The mushroom's nerve evidence is two kinds, and neither is human. The first is cell culture: hericenones from the fruiting body and erinacines from the mycelium stimulate the synthesis of nerve growth factor in cultured cells and promote the outgrowth of neurites in a dish, which is real bench biology about a real signalling protein and says nothing about a nerve inside a person. The second is rodent models, mostly of traumatic damage: rats with a crushed sciatic nerve fed lion's mane extract at large doses by body weight recovered function faster and regrew more axons than controls in several studies, and a few diabetic rodent models show signals on the metabolic column. No human study of any kind of nerve damage has been done with lion's mane: no trial in compression neuropathies, none in diabetic or B12 neuropathy, none in traumatic injury, none in chemotherapy-induced neuropathy, no case series, nothing, which means the human column of every row in the table is empty for the mushroom and the help the question asks about has never been looked for in a person. No authorised UK health claim exists for lion's mane on nerves or anything else, so no tub may print nerve, nerve health or nerve damage, and the many that do are printing the rodent column where the human one should be. The honest statement is that lion's mane helps none of the four kinds of nerve damage in any sense anyone has measured, that its rodent results would need a human trial to mean anything and that trial has not been run, and that a reader who has read otherwise has read a cell and a rat described as a person. What a person with nerve symptoms actually does follows the table rather than the shelf. Numbness or tingling in a hand, a dropped grip, a burning thigh, pain down a leg, or numb feet is taken to a clinician who identifies the kind by examination and, where needed, nerve conduction studies and blood tests, and the fix follows the kind: pressure removed for the compressive kind, which is most lifters' kind; glucose, B12 or thyroid corrected for the metabolic kind, with a B12 test the one blood test anyone with nerve symptoms should have if their diet or medication makes deficiency plausible; repair, time and rehabilitation for the traumatic kind; and the agent stopped for the toxic kind. A capsule belongs in none of those sentences, and a person who delays the clinician's visit to try a mushroom for a compressed or metabolic nerve has let a reversible problem run longer, which is the one way the mushroom can do a nerve harm. Lion's mane is bought, if at all, for its two small cognitive studies, described on this site as studies. In no column of the table: a stated 5:1 fruiting body extract labelled 1500mg mushroom equivalent, 120 capsules for £15.49, 120 days at 13p, vegan shell, UK made under GMP and BRC, independently lab tested, with no nerve sentence on its label because none has been earned in any kind of nerve.

What to check on the label