WE GROW ALL OUR MUSHROOMS
Shiitake
Grown in Portimao, Portugal
Vegan
EU Certified Organic
100% Traceable
Lab tested
No third party mushrooms
Pure and Certified Organic Shiitake mushroom — cultivated in Portugal. Beta-glucans and naturally occurring compounds that support immune function and metabolic health from within.
For a body that stays strong because of what you build, not what you fix.
What's Shiitake
Shiitake — Lentinula edodes — is East Asia's most celebrated medicinal mushroom, used for over 2,000 years in Chinese and Japanese herbal medicine.
This is Gribb's powder and capsule format — a 10:1 concentrated extract standardised to 32–40% beta-glucans (β1,3 / β1,6), grown in-house in Portugal, available as a fine unflavoured powder that blends invisibly into any food or drink, or as vegan HPMC capsules (pine fibre) for those who prefer a straight-forward daily supplement.
This product is not intended to diagnose, treat, cure, or prevent any disease.
powder vs capsules - which is right for you
Powder
Best for: smoothie and drink ritualists
Stirs or blends invisibly into any food or drink. Flavour-neutral. Works in smoothies, matcha, yogurt, oat porridge, cacao. Maximum versatility.
Capsules
Best for: no-fuss daily supplement takers
Vegan HPMC (pine fibre). 2 capsules daily with water. Same formula, same dose — for people who want the benefit without integrating powder into their routine.
Ideal for
- You want clinically validated immune support from a single, clean mushroom source Lentinan is classified as a Biological Response Modifier — it activates macrophages, natural killer cells, and cytokine signalling. No other mushroom compound has achieved pharmaceutical approval. Shiitake is the single-mushroom choice for those who want depth of clinical evidence behind what they take.
- You want a daily functional mushroom with the broadest natural nutrient profile Unlike most medicinal mushrooms valued solely for their polysaccharides, shiitake delivers a genuinely complete nutritional matrix — B vitamins, vitamin D, copper, zinc, selenium, eritadenine, ergothioneine, and lentinan — all naturally occurring in the 10:1 concentrated whole fruiting body extract. A functional mushroom that also nourishes.
- You're looking for a simple daily ritual — powder or capsules, your choice One ingredient. Two formats. The powder blends into coffee, smoothies, soups, or morning drinks with a naturally mild umami note. The capsules are pure convenience — two a day with water. No flavour, no fuss. One month or two month supply depending on your size.
SPECIFICATIONS
Mushroom: Shiitake — Lentinula edodes — certified organic 10:1 concentrated extract from whole fruiting body, grown in Portugal
Extraction ratio: 10:1 concentrated extract
Mushroom dose: 2,000mg per serving
Beta-glucan content: Standardised 32–40% (β1,3 / β1,6)
Formats: Fine powder (60g) · vegan HPMC capsules — pine fibre (60 × 1,000mg)
Servings: 30 servings / 1-month supply at 2g dose
Certification: Certified Organic PT-BIO-10
Sourcing: Grown in Portugal by Gribb · no third-party mushrooms ·
Allergens: No known allergens in formula. Produced in a facility handling nuts, coconut, and sesame.
Ingredients
Powder: 100% Shiitake — Lentinula edodes — certified organic 10:1 concentrated extract from whole fruiting body, grown in Portugal
Contains 60g — approx. 30 servings.
Capsules: Same mushroom extract.
Capsule shell: HPMC (hydroxypropyl methylcellulose, pine fibre) — vegan. 60 capsules × 1,000mg.
Allergens: No known allergens. Produced in a facility that handles nuts, coconut, and sesame.
Packaging may vary.
How to use
- Powder: Add 1 small tsp (2g) to your favourite drink, smoothie, yogurt, or recipe. Blends invisibly — no flavour impact.
- Capsules: Take 2 capsules (2,000mg) daily with a glass of water.
Best taken consistently as part of a daily routine. Most people notice changes in skin hydration and texture after 3–4 weeks of consistent use.
What to expect
Ritual beats intensity. Same time, every day. That's the whole game.
WEEK 1–2
Your body is absorbing and adjusting to the blend. The functional mushrooms
and adaptogenic botanicals need time to build in your system — most people
notice little change yet and that is completely normal. Stay consistent.
WEEK 3
This is usually when subtle shifts begin. Days feel slightly more even. The
afternoon dip that used to derail you starts to feel less sharp. Not a spike —
a steadier floor.
MONTH 1+
The cumulative effect. Most people at this point notice the difference on the
days they forget to take it. The vitality feels like yours — not something
borrowed from caffeine.
For informational purposes only. Not intended to diagnose, treat, cure or
prevent any disease.
Why dual extraction matter
Most products use a single extraction — which means they only capture part of what this mushroom has to offer.
Gribb's tincture uses a dual-extraction process: first with hot water to release the water-soluble beta-glucans, then with organic alcohol to extract the fat-soluble compounds. The two extracts are then combined into a single, full-spectrum liquid. It's a more time-intensive method — and the reason this tincture delivers what a capsule or powder alone cannot.
Choose options
Ritual beats intensity. Same time, every day. That's the whole game.
What to expect - day by day:
Week 1
Foundation. Your body is absorbing and adjusting. No dramatic changes yet. This is normal and expected.
Week 3
This is usually when subtle shifts begin. Days feel slightly more even. The afternoon dip that used to derail you starts to feel less sharp. Not a spike — a steadier floor.
MOnth 1+
The cumulative effect. Most people at this point notice the difference on the days they forget to take it. The vitality feels like yours — not something borrowed from caffeine.
Not sure where to start?
Different mushrooms work on different systems. Pick the pair that matches what you actually want to change.
Not sure? Take the 60-second quiz — we'll tell you your ideal support
Frequently Asked Questions
Gribb Organic Shiitake is a certified-organic 10:1 concentrated extract powder and capsule supplement made from Lentinula edodes whole fruiting body, grown in Portugal under PT-BIO-10 organic certification. Serving size: 2g powder (1 level tsp) or 2 capsules (2 × 1,000mg) = 2,000mg per serving. Beta-glucans standardised to 32–40% (β1,3/β1,6). Key bioactives: lentinan (β-1,3/β-1,6 glucan, Biological Response Modifier status; the basis of Japan's first mushroom-derived pharmaceutical drug approval, 1985), eritadenine (purine alkaloid exclusive to shiitake, cholesterol metabolism), ergothioneine (antioxidant amino acid), naturally occurring B vitamins (pantothenic acid, niacin), vitamin D, copper, zinc, selenium.
Available in: 60g opowder (30 servings); 60 HPMC vegan capsules (30 servings). Vegan. No known allergens. Facility handles nuts, peanuts, sesame seeds, gluten, soy.
Lentinan is a specific type of beta-glucan (β-1,3 with β-1,6 branches) found only in shiitake mushrooms. In 1985 it became the first mushroom-derived compound in the world to achieve pharmaceutical drug approval — approved by Japan's Ministry of Health, Labour and Welfare as an adjunct treatment for gastric cancer — a distinction that required rigorous clinical evidence equivalent to pharmaceutical standards. Classified as a Biological Response Modifier, lentinan activates macrophages, natural killer cells, and cytokine production without directly attacking pathogens — it works by enhancing the immune system's own coordination and response. No other mushroom compound worldwide has met the same bar.
Eritadenine is a purine alkaloid and arguably shiitake's most biochemically distinctive compound. Research published in the Journal of Japanese Society of Nutrition and Food Science confirmed that shiitake caps contain 60–70mg% eritadenine per dry weight — while other common mushrooms including enoki, nameko, shimeji, and kikurage showed no detectable levels. It is studied for its effects on cholesterol metabolism through hepatic phospholipid pathways and CYP7A1 mRNA expression. It's the compound that makes shiitake genuinely unique from a nutritional science standpoint — something no other mushroom in the range delivers.
Yes — every mushroom in this kit is grown in our own certified-organic urban farm in Portimão, Portugal. We grow them ourselves from spore through to harvest. Nothing is imported from third-party suppliers or rebranded from elsewhere.
Our production is certified organic by NATURALFA (PT-BIO-10) and every batch is third-party tested before it ships. Full traceability from farm to your door.
Both contain exactly the same organic shiitake — same mushroom, same dose per serving (2,000mg), same standardisation. The choice is purely about how you prefer to take it. Powder is ideal if you already have a daily morning ritual — coffee, smoothie, golden milk, soup — shiitake has a mild natural umami that integrates well and doesn't overpower. Capsules are for people who want zero friction — two capsules with water and done, no measuring, no mixing, easy to travel with. Many people start with capsules for routine-building and switch to powder once they find their preferred daily drink.
No specific timing is required — shiitake has no stimulating or sedating compounds, so it can be taken any time of day. Morning is most popular for powder users who add it to their first coffee or smoothie. For capsule users, any consistent time works — the key is daily regularity rather than timing. Take with or without food.
The powder is the most versatile format — it mixes invisibly into any food or drink and is ideal for younger children who can't swallow capsules. The capsules (vegan HPMC, made from pine fibre) are better suited to older children and teenagers who prefer a straightforward capsule they can take with water. Both contain exactly the same mushroom blend at the same standardised beta-glucan content.
Yes. Every mushroom used in Gribb's Lion's Mane tincture is grown on Gribb's own certified-organic farm in Portugal — certified under PT-BIO-10. No third-party mushrooms are ever used, which means full traceability from spore to bottle. Every batch is lab-tested for beta-glucan content and purity before it leaves the farm.