Best overall
Four Sigmatic
Focus Ground Coffee – Dark Roast (Lion's Mane & Chaga)
7.7Good
Organic dark-roast ground coffee with lion's mane and chaga extracts. It brews and tastes like regular coffee, with full caffeine.
4$1.54 / cup
Spacegoods
Rainbow Dust (Coffee flavour)
UK-made 'coffee plus' powder with disclosed doses of lion's mane, cordyceps, chaga and ashwagandha; 80–120 mg caffeine. Pricey in the US.
7.1
Fair
Coffee Reviews score
See the breakdown →
Community
—/10
- Format
- Powder mix
- Caffeine
- Regular
- Price per serving
- $2.23 / cup
Heavy-metal tested
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Last reviewed October 17, 2026 by the Coffee Reviews editors · How we score
UK-made 'coffee plus' powder with disclosed doses of lion's mane, cordyceps, chaga and ashwagandha; 80–120 mg caffeine. Pricey in the US.
Rainbow Dust is a flavoured instant powder that combines coffee with three fruiting-body mushroom extracts (1,000 mg each of lion's mane, cordyceps and chaga), KSM-66 ashwagandha, maca and vitamin B5. Unlike most rivals it publishes per-ingredient doses. An 8 g scoop gives 80–120 mg of caffeine, and a bag holds 30 servings. Spacegoods says it is made in England and third-party tested, including for heavy metals. US buyers pay $67 for a bag of the Coffee flavour (about $2.23 a serving) plus international shipping, which makes it one of the costliest options here.
Best for
- People who want disclosed, substantial mushroom doses
- Flavoured instant drinks that double as a latte or iced coffee
- Shoppers already familiar with UK functional brands
What we like
- Publishes per-ingredient doses (1,000 mg each of lion's mane, cordyceps and chaga)
- Fruiting-body extracts and KSM-66 ashwagandha
- Several flavours; mixes hot or iced with water or milk
- Brand states heavy-metal and allergen testing
Watch-outs
- Expensive in the US ($67 per 30-serving bag) plus international shipping
- Caffeine varies (80–120 mg), which may surprise people looking for a low-caffeine drink
- Full flavour-specific ingredient lists are tucked behind a pop-up nutrition panel
- Limited US availability outside the brand's website
How it scored
The breakdown.
7.1Fair
Cup score out of 10, weighted across five factors.
- Flavor & cup quality30%7.2
Comes in several flavours and is pitched as tasting like coffee or hot chocolate; independent video reviewers try it as a taste test, but we found no written tasting verdicts.
- Quality & freshness20%8.3
Discloses meaningful doses: 3,000 mg of fruiting-body mushroom extracts plus KSM-66 ashwagandha per serving, more than most US rivals.
- Value20%5.6
About $2.23 a serving in the US before shipping, at the expensive end of the category.
- Sourcing & transparency15%7.6
Made in England, labelled fruiting-body and dual-extracted, and the brand says it tests for heavy metals and allergens; it publishes no lab reports.
- Community love15%7.0
The brand reports 30M+ servings sold worldwide, and several unsponsored YouTube reviews exist, but there is little US-specific coverage.
Creator video reviews
Watch it in action.
1 positive
Independent creators, verified with YouTube and TikTok. We don’t pay for reviews and creators don’t pay us.
Details
The particulars.
- Format
- Powder mix
- Caffeine
- Regular
- Functional ingredients
- Lion's mane fruiting-body extract (1,000 mg), Cordyceps sinensis fruiting-body extract (1,000 mg), Chaga 12:1 extract (1,000 mg), KSM-66 ashwagandha (300 mg), Maca root (250 mg), Vitamin B5 (6 mg)
- Ingredients
- Per 8 g serving, as listed by the brand: lion's mane fruiting-body extract 1000 mg, Cordyceps sinensis fruiting-body extract 1000 mg, chaga 12:1 fruiting-body extract 1000 mg, KSM-66 ashwagandha 300 mg, maca root 250 mg, natural caffeine (from coffee) 80–120 mg, vitamin B5 6 mg, plus coffee and cacao. The full flavour-specific ingredient list sits behind the page's 'Nutritional Information' panel.
- Nutrition (per serving)
- serving size: 8 g · caffeine mg: 80–120
- Best brewed as
- Just add water, Lattes & milk drinks, Iced / over ice
- Certifications
- Heavy-metal tested
- Typical price
- $67.00 for 1 bag, 30 servings (240 g) (checked October 2026)
- Servings
- 30 servings of 8 g. US price shown on the USD storefront when checked; Spacegoods charges international shipping to the US.
Community
Member tasting notes & discussion.
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FAQ
Good questions.
Is Spacegoods Rainbow Dust sold in the US?
Yes. Spacegoods runs a US storefront priced in dollars (a Coffee-flavour bag was $67 when checked) and lists the United States among its international shipping destinations, with a shipping fee.
How much caffeine does Rainbow Dust have?
Spacegoods lists 80–120 mg of natural caffeine from coffee per 8 g serving, similar to a regular cup of coffee. It also sells a decaf coffee flavour.
What's in it?
Per serving the brand lists 1,000 mg each of lion's mane, cordyceps and chaga fruiting-body extracts, 300 mg KSM-66 ashwagandha, 250 mg maca root and 6 mg vitamin B5, plus coffee and cacao.
Is it third-party tested?
Spacegoods says its products are third-party lab tested and that it tests for heavy metals and allergens such as gluten and dairy. It doesn't publish the reports on the product page.
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Best value
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7.4Good
A low-cost functional ground coffee: Peruvian medium roast with lion's mane, rhodiola and coffee cherry for about $0.59 a cup.
1$0.59 / cup
Om Mushroom Superfood
Mushroom Coffee Blend (Lion's Mane & Cordyceps)
7.2Good
Organic instant coffee with 2,000 mg of lion's mane and cordyceps that Om grows itself, plus 110 mg caffeine and disclosed beta-glucans.
Mushroom & Functional2$1.40 / cup
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RYZE Superfoods
Mushroom Coffee (Medium Roast)
7.1Fair
Mild organic instant coffee with six mushrooms and ~48 mg caffeine. Easy to make, but the taste divides people and a one-off bag is pricey.
5$1.50 / cup