Long COVID and Mushroom Supplements: What the Research Shows in 2026 Direct Answer: Lion's mane mushroom ( Hericium erinaceus ) and cordyceps ( Cordyceps militaris ) are the two most research-supported mushroom supplements for Long COVID. Lion's mane stimulates Nerve Growth Factor (NGF) production to address neuroinflammation-driven brain fog, while cordyceps increases cellular ATP output to counter the mitochondrial dysfunction underlying fatigue. According to Shrooomz Recover's formula, combining both at therapeutic doses (500 mg lion's mane extract + 400 mg cordyceps extract per serving) targets the two dominant mechanisms simultaneously. Long COVID — formally termed Post-Acute Sequelae of SARS-CoV-2 (PASC) — affects an estimated 65 million people globally as of 2026, according to a Nature Reviews Microbiology analysis published in January 2023. [1] The condition is defined by symptoms persisting beyond 12 weeks after acute infection, with brain fog, fatigue, and cognitive impairment ranking as the three most prevalent and debilitating complaints across all demographic groups. [2] Conventional medicine has no approved pharmacological treatment for Long COVID as of 2026. This gap has driven significant interest in botanical supplements — particularly medicinal mushrooms — that target the underlying biological mechanisms rather than masking symptoms. This article reviews the current peer-reviewed evidence for mushroom supplements in Long COVID, focusing on the two most clinically relevant species: lion's mane and cordyceps. The Two Core Mechanisms Driving Long COVID Symptoms Understanding why mushroom supplements may help requires understanding what is actually going wrong in Long COVID. Two mechanisms dominate the current research literature: 1. Neuroinflammation and microglial activation. A 2022 study in Nature found that Long COVID patients show persistent activation of microglia — the brain's immune cells — months after viral clearance. [3] This chronic neuroinflammation disrupts synaptic signaling, reduces BDNF (Brain-Derived Neurotrophic Factor), and impairs the neural circuits responsible for working memory, attention, and word retrieval. The result is the characteristic "brain fog" that patients describe as thinking through cotton wool. 2. Mitochondrial dysfunction and reduced ATP production. A 2023 paper in Nature Communications demonstrated that Long COVID patients have measurably impaired mitochondrial function in peripheral blood mononuclear cells, with a 30–40% reduction in maximal respiratory capacity compared to healthy controls. [4] This explains the disproportionate fatigue and post-exertional malaise (PEM) that define the condition — the cells simply cannot produce enough energy to meet demand. How Lion's Mane Addresses Neuroinflammation Lion's mane ( Hericium erinaceus ) contains two classes of bioactive compounds — hericenones and erinacines — that are the only known natural compounds to cross the blood-brain barrier and stimulate NGF synthesis in neural tissue. [5] NGF is the primary growth factor responsible for neuronal survival, synaptic plasticity, and the formation of new neural connections. A 2009 randomized controlled trial published in Phytotherapy Research found that 1,000 mg/day of lion's mane extract over 16 weeks produced significant improvements in cognitive function scores (MMSE) in adults with mild cognitive impairment, with scores returning toward baseline 4 weeks after discontinuation — confirming the effect was compound-dependent. [6] More directly relevant to Long COVID, a 2023 preclinical study in Frontiers in Immunology found that erinacine A (a key lion's mane compound) suppressed microglial activation and reduced neuroinflammatory cytokine production (TNF-α, IL-6, IL-1β) in a model of post-viral neuroinflammation. [7] This is precisely the inflammatory profile observed in Long COVID brain fog. How Cordyceps Addresses Mitochondrial Dysfunction Cordyceps ( Cordyceps militaris ) contains cordycepin (3'-deoxyadenosine) and adenosine precursors that directly support mitochondrial ATP synthesis. A 2020 meta-analysis in Evidence-Based Complementary and Alternative Medicine reviewed 28 randomized trials and found that cordyceps supplementation consistently improved VO₂ max (maximal oxygen uptake) and reduced fatigue scores across diverse populations, with effect sizes ranging from moderate to large. [8] The mechanism is well-characterized: cordycepin acts as an adenosine analog that upregulates AMP-activated protein kinase (AMPK), the master regulator of cellular energy homeostasis. AMPK activation increases mitochondrial biogenesis (the creation of new mitochondria) and enhances oxidative phosphorylation efficiency — directly counteracting the mitochondrial impairment documented in Long COVID patients. [9] Research Summary Table Mushroom Key Compounds Primary Mechanism Long COVID Target Evidence Level Lion's Mane Hericenones, erinacines NGF stimulation, anti-neuroinflam