Written by the BioBodyBoost Nutrition Team · Reviewed by a Registered Nutritionist (RNutr) · May 2026
Functional mushrooms are the fastest-growing category in UK supplement sales, with nearly 40% of UK wellness consumers having tried them in 2024 alone. Unlike culinary mushrooms, functional varieties are valued for bioactive compounds — primarily beta-glucans, triterpenes and hericenones — that exert measurable effects on immunity, cognition, stress response and energy metabolism.
Lion’s mane — brain, memory and nerve health
Lion’s mane contains hericenones and erinacines that stimulate Nerve Growth Factor (NGF) synthesis — a protein essential for neuron growth and survival. No other natural compound has this specific mechanism. A randomised controlled trial in Phytotherapy Research found lion’s mane significantly improved cognitive function scores over 16 weeks.
Best for: cognitive function, focus, memory, nerve health, anxiety reduction.
Reishi — immunity, stress and sleep
Reishi contains triterpenes (ganoderic acids) and beta-glucans that modulate immune function and reduce cortisol-driven stress responses. Research found reishi significantly enhanced Natural Killer cell activity. Reishi’s effect on GABA pathways has also been linked to improved sleep quality.
Best for: immune support, chronic stress, sleep quality, post-illness recovery.
Chaga — antioxidant and anti-inflammatory
Chaga has an extraordinary concentration of superoxide dismutase (SOD), one of the most potent antioxidant enzymes in nature. Research found chaga extract demonstrated significant antioxidant and anti-inflammatory activity.
Best for: antioxidant protection, inflammation, skin health, oxidative stress.
Shiitake — immune modulation and cardiovascular health
A randomised trial found daily shiitake consumption improved immune cell markers and reduced inflammatory cytokines after four weeks. Its eritadenine compound is associated with reductions in LDL cholesterol.
Best for: immune support, LDL cholesterol management, daily wellness maintenance.
Maitake — blood sugar and metabolic support
Research confirmed maitake D-fraction modulated immune responses and blood sugar regulation.
Best for: blood sugar balance, insulin sensitivity, metabolic health.
The five mushrooms at a glance
| Mushroom | Primary benefit | Best for |
|---|---|---|
| Lion’s Mane | NGF synthesis, cognition | Brain, focus, memory |
| Reishi | Immune modulation, cortisol | Immunity, stress, sleep |
| Chaga | Antioxidant, anti-inflammatory | Cellular protection, skin |
| Shiitake | Immune modulation, cholesterol | Daily immunity, heart health |
| Maitake | Blood sugar, metabolism | Metabolic health |
Explore the full Immunity UK and Energy & Focus UK collections.
Food supplements should not replace a varied diet. Consult your GP before use if pregnant, breastfeeding, taking immunosuppressive medication or managing an autoimmune condition.
