Bristol Fungarium Discount Code: 10% Off + Product Review

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Will founded Supermushrooms after digging into the research behind mushroom and nootropic supplements. Every pick is checked against clinical dosing, extract standardisation, and real buyer reviews, and each star rating starts from a product's real Amazon score before being adjusted for formulation quality. Read more about how ratings are calculated.

Bristol Fungarium discount code: use SUPERMUSHROOMS at checkout for 10% off any order, including the three tinctures reviewed below.

Bristol Fungarium is a Somerset-based medicinal mushroom company that grows and triple-extracts its Lion's Mane and Reishi on UK soil, rather than importing bulk extract from abroad and bottling it domestically, which is how a fair number of "UK mushroom supplement" brands actually operate. Every tincture in the core range follows the same simple formula: organic mushroom fruiting body, purified water and plant-derived alcohol, extracted at a 1:4 ratio through what the brand describes as a triple-extraction process, and certified organic by the Soil Association. This review covers the three tinctures the brand itself bundles together as its most popular combination, Lion's Mane, Reishi and Chaga, plus how to use the SUPERMUSHROOMS code.

Key Takeaways (TL;DR)

• Code SUPERMUSHROOMS takes 10% off any order at checkout on bristolfungarium.com.
• Lion's Mane and Reishi are grown and extracted in Somerset, UK; Chaga is wild-harvested from a specialist overseas producer, since it doesn't grow at commercial scale in Britain.
• All three are 1:4 triple-extracted tinctures with a short, disclosed ingredient list: organic mushroom, purified water, plant-derived alcohol.
• Suggested dose is 1-2ml daily (50 servings per 50ml bottle), dropped into water, juice, tea or coffee.
• Chaga is capped lower, at up to 1ml daily, because of its oxalate content.
• These are alcohol-based tinctures, which matters if you're avoiding alcohol for any reason, including pregnancy.
• Each tincture targets a different use case rather than competing with the others: Lion's Mane for focus, Reishi for sleep and stress, Chaga for immune and gut support.

How to Use the SUPERMUSHROOMS Code

Enter SUPERMUSHROOMS in the discount code box at checkout on bristolfungarium.com for 10% off your order. It applies across the tincture range, including all three products below, and there's also a separate subscribe-and-save option at checkout if you plan to reorder.

Lion's Mane Tincture — Brain Fog & Focus

Bristol Fungarium markets this one squarely at brain fog and focus, which lines up with where the actual research on Hericium erinaceus is strongest: a small double-blind, placebo-controlled trial in older adults with mild cognitive impairment found four weeks of supplementation improved cognitive scores, an effect that faded after supplementation stopped.¹ A separate trial found four weeks of Hericium erinaceus intake reduced depression and anxiety symptoms in a general population, alongside the cognitive work.² Both trials used capsule or powder forms rather than a tincture specifically, so treat the dose-matching as approximate rather than exact, which is worth knowing before assuming the liquid format delivers an identical effect.

The tincture itself is triple-extracted at a 1:4 ratio from organic UK-grown fruiting bodies, farmed on the same Somerset site as the Reishi below. It's vegan, and the full ingredient list is just organic Lion's Mane, purified water and plant-derived alcohol, no fillers or flavourings. For a wider look at capsule and powder alternatives, see our Best Lion's Mane Capsules UK guide.

Reishi Tincture — Sleep & Stress Support

Ganoderma lucidum has one of the longest research histories of any medicinal mushroom, with documented immunomodulatory and general pharmacological activity across a wide body of lab and animal work.³⁴ The specific sleep claim Bristol Fungarium makes for this product is harder to pin down in humans directly; the clearest supporting data is an animal study, where a Ganoderma lucidum extract extended sleep time in rats.⁵ That's a real finding, but it's rodent pharmacology rather than a human sleep trial, so read the "sleep and stress support" framing as plausible and consistent with Reishi's traditional use rather than clinically proven in people at this dose.

This is the other Somerset-grown tincture in the range, extracted at the same 1:4 ratio with the same three-ingredient formula. The brand states it's cloned from a native UK strain rather than imported mycelium, which is a genuine point of difference from Reishi products built on generic commercial strains. Our Reishi mushroom supplement guide covers capsule and powder alternatives if a tincture isn't your preferred format.

Chaga Tincture — Immunity & Gut Health

Chaga is the one product here that isn't UK-grown. Inonotus obliquus needs mature birch forest to form at all, so Bristol Fungarium sources it wild-harvested from a specialist overseas producer rather than farming it in Somerset alongside the other two, something worth knowing if UK provenance specifically is why you're buying. Traditional and lab-based research points to real immunomodulatory activity,⁶ and a wider ethnomycological review documents its long use across polysaccharide-driven immune and antioxidant pathways.⁷ Most of that evidence base is still preclinical or traditional-use documentation rather than large human RCTs, so treat "supports immunity" as a reasonable, traditionally-grounded claim rather than a clinically proven one.

Chaga is also the one tincture in this range with a genuine, documented safety caveat: a published case report links concentrated Chaga supplementation to oxalate nephropathy, kidney harm driven by its naturally high oxalate content.⁸ That's consistent with Bristol Fungarium capping its own suggested Chaga dose lower than the other tinctures, at up to 1ml daily rather than the 1-2ml range for Lion's Mane and Reishi. Same 1:4 triple extraction and three-ingredient formula as the rest of the range. See our Best Chaga Mushroom Supplement guide for powder and capsule alternatives.

Safety and Side Effects

These are alcohol-based tinctures, not capsules or powder, which is worth factoring in if you're avoiding alcohol for any reason, including pregnancy, certain medications, or recovery from alcohol use. Each 1ml serving contains a small but real amount of plant-derived alcohol used as the extraction solvent. For the mushrooms themselves, general safety and interaction information is covered in more depth on each species' own page: Lion's Mane, Reishi (note Reishi's mild blood-thinning effect, relevant if you're on anticoagulant medication or have surgery scheduled) and Chaga (the oxalate caution above). Bristol Fungarium's own guidance is to start at a lower dose and build up gradually with any new tincture, and to check with a GP or pharmacist first if you're on medication, have a medical condition, or have an upcoming procedure. None of the three tinctures here have been studied specifically in pregnancy, so the same caution that applies to herbal and mushroom supplements generally applies to this range too.

Bristol Fungarium Discount Code FAQ

Is there a working Bristol Fungarium discount code?

Yes. SUPERMUSHROOMS takes 10% off at checkout on bristolfungarium.com, across the tincture range covered in this review.

How do I apply the SUPERMUSHROOMS code?

Add your products to the cart, go to checkout, and enter SUPERMUSHROOMS in the discount code field before paying. It's a standard Shopify checkout, so the discount recalculates your total automatically once applied.

Does Bristol Fungarium offer a subscription discount too?

Yes, there's a separate subscribe-and-save option at checkout for anyone planning to reorder regularly, in addition to the one-off SUPERMUSHROOMS code.

Are Bristol Fungarium tinctures actually UK-grown?

Lion's Mane and Reishi are farmed and triple-extracted on the brand's own Somerset site. Chaga is the exception: it's wild-harvested from a specialist overseas producer, since the species needs mature birch forest that isn't commercially available in the UK.

Can I take Lion's Mane, Reishi and Chaga together?

There's no specific research on combining these three tinctures, but each targets a different use case (focus, sleep and stress, immune and gut support) rather than overlapping doses of the same compound class. Introduce one at a time at a lower dose first, and check with a GP if you're on medication or have a health condition, per Bristol Fungarium's own guidance.

How long does a 50ml bottle last?

At the suggested 1-2ml daily dose, a 50ml bottle gives 25-50 servings, so roughly three to seven weeks depending on how much you take and how consistently.

Verdict

Bristol Fungarium's main strength is traceability: two of the three tinctures here are grown and extracted on one Somerset site rather than relabelled bulk extract, every product discloses the same short three-ingredient list, and the brand is upfront about Chaga being the one sourced overseas rather than quietly implying the whole range is UK-grown. Lion's Mane has the strongest human evidence behind its stated use case; Reishi's sleep claim leans on animal data rather than human trials; Chaga's immune claim is real but still mostly preclinical, and comes with a genuine oxalate caution the brand itself doses around. With the SUPERMUSHROOMS code taking 10% off, it's a reasonable way to try a UK-farmed tincture range rather than another imported powder in a capsule.