Spacegoods Review 2026: Is Rainbow Dust Worth It?

Spacegoods Rainbow Dust is a powdered mushroom coffee blend with lion's mane, cordyceps and chaga at 1,000 mg each, plus ashwagandha and maca: a one-off 30-serving bag costs £49.00 (£1.63 a cup), a serving of the coffee flavour holds 80 to 120 mg of caffeine, and it ranks No. 2 in our top 5.

Its strengths are easy to list. Spacegoods is based in London, says its products are made in England and ships UK orders from Birmingham. It has the largest review base in our ranking, a 60-day money-back guarantee and a label with milligrams for each active. Holland & Barrett sells it, and Tesco lists it online.

It loses ground on the numbers we rank by. A serving has roughly the caffeine of a mug of instant coffee, a single one-off bag is the most expensive per cup in our top 5, and its declared actives add up to 3,550 mg by our count, against 6,225 mg of declared actives per cup for our No. 1.

How we work: Tim's Reviews compares labels, prices, public reviews and studies. Links to brand shops on this site are affiliate links, and our top 5 only lists partner brands, Spacegoods included.

Spacegoods gives milligrams for each active on the product page and describes its mushrooms as fruiting body extracts. That matters: mycelium grown on grain and the fruiting body are not equal on beta-glucans, which labs can measure with published methods.

Two details are worth knowing. The product page gives 12:1 for the chaga, while the help centre lists other ratios for the Coffee flavour (4:1 for chaga and cordyceps, 5:1 for lion's mane): the milligrams stay the same, but not the amount of raw mushroom behind them. A serving of Coffee carries about 22 kcal, and the product page describes the blend as vegan, gluten-free and with no added sugar.

On mushrooms, Rainbow Dust sits mid-table in our top 5: the same 3,000 mg as Brainstoorm, more than Clearly (2,500 mg) and Myracle (2,100 mg), less than Gold Dust (4,000 mg). It has no reishi and far less maca than our No. 1, and it lists chicory root fibre without giving a dose. Our guide to how much lion's mane is in each cup compares UK brands one by one.

A serving of Rainbow Dust Coffee contains 80 to 120 mg of caffeine according to Spacegoods, and the Holland & Barrett listing states 120 mg. The NHS puts a mug of instant coffee at about 100 mg, so one serving is roughly one ordinary cup.

The product FAQ allows up to three servings a day, the help centre suggests one or two. Three servings of a coffee flavour would mean 240 to 360 mg, well over the 200 mg daily limit the NHS sets in pregnancy. The Holland & Barrett page adds that the product is not intended for children, pregnant or breastfeeding women, or people sensitive to caffeine.

The flavour matters. Decaf Coffee has less than 10 mg per serving, according to the help centre. Chocolate has a cocoa base and no published caffeine figure, and we found no separate figures for Coffee Caramel, Coffee Hazelnut or Vanilla Cinnamon, so check the label of the flavour you choose.

So Rainbow Dust Coffee replaces your coffee rather than cutting it. If less caffeine is the goal, our UK ranking of the best mushroom coffees sorts all five by caffeine per cup.

Nobody can honestly say that Rainbow Dust works, or how long it takes, because the drink itself has never been studied. There are small trials on some ingredients, often at higher doses than a serving.

• Lion's mane. Northumbria University (2023) gave 1.8 g a day for 28 days to 41 healthy adults aged 18 to 45: one task was faster 60 minutes after a dose, other results were null or negative, and the authors urge caution. A 2009 Japanese trial gave 30 adults aged 50 to 80 with mild cognitive impairment about 3 g of powder a day for 16 weeks; scores beat placebo at weeks 8 to 16, then fell back after stopping. Rainbow Dust has 1,000 mg.
• Cordyceps. The trial most often quoted used 4 g a day of a blend with Cordyceps militaris, not the sinensis in Rainbow Dust, in 28 young adults: no significant change after one week, a higher VO2max after three weeks in the 10 who carried on.
• Ashwagandha. Trials used 240 mg a day, or 300 mg twice a day, for 60 days, with no serious adverse events reported. Rainbow Dust has 300 mg of KSM-66.

And the benefits? In Great Britain, that is a legal question. Only health claims authorised on the GB nutrition and health claims register may be made for a food, and the CAP Code applies the same rule to adverts. The register has none for lion's mane, chaga or ashwagandha, and lists the claims filed for cordyceps as not authorised. Authorised wording on a blend like this comes from its vitamins, such as vitamin B5 and tiredness, and only if the product is a significant source. That is why we describe doses and studies, not benefits.

Most of the risk comes from two ingredients, caffeine and ashwagandha. The mushrooms have a shorter list, from rare case reports.

• Caffeine: 80 to 120 mg per serving of Coffee. The NHS advises no more than 200 mg a day in pregnancy and while breastfeeding, from all sources. If you are sensitive to it, Decaf (under 10 mg) is the swap.
• Ashwagandha: liver injury has been reported. LiverTox lists cases, and a 2023 Indian series described 8 patients harmed by single-ingredient products; 3 of them, all with existing liver disease, died. These are rare reports, not a frequency. The Food Standards Agency passed its 2024 call for evidence to the Committee on Toxicity; no final opinion had been published by 29 September 2026.
• Chaga: very high in oxalates. A 2014 case report described kidney damage in a woman of 72 who took 4 to 5 teaspoons of chaga powder a day for six months. With kidney stones or kidney disease, ask your GP first.
• Lion's mane: rare allergic reactions are documented, including one case of acute respiratory distress in Japan.

Spacegoods' health FAQ sends pregnant and breastfeeding women to their doctor, and anyone on medication to their GP. Our guide to lion's mane side effects goes through each ingredient, medicines included.

On 29 September 2026, a single 30-serving bag cost £49.00 as a one-off purchase on spacegoods.com, or £1.63 a cup. Bigger orders lower the price per cup, and trial packs let you start small.

The Starter Kit is where it gets confusing. It adds free accessories to a first order, but Spacegoods' FAQ says Starter Kits are for subscribers only. A single bag can still be bought one-off, and that is the page our link opens. Subscriptions refill monthly, or every three months with Buy 2, Get 1 Free, and ship free, against £3.99 otherwise (Royal Mail Tracked 48) or £6.99 next day. The subscription price moves with the brand's sales, so check it on the day.

You cancel from your account on spacegoods.com, where you can also change products or the delivery date. Spacegoods says it sends no reminder before taking payment, so note your renewal date. The 60-day guarantee means asking within 60 days of receiving your first order, for one opened bag per product per customer. Current offers and our partner code are on our Spacegoods discount code page.

On 29 September 2026, Spacegoods had 9,716 reviews on Trustpilot's UK site, scoring 4.5 out of 5: by far the largest review base in our top 5 (Variety Mode 1,776, Clearly 1,060, Mush N Go 692, Myracle 72). A score built on almost ten thousand reviews is hard to move, a genuine point in Spacegoods' favour.

A score does not tell you whether the drink does anything. Reviews mix taste, delivery, subscriptions and how people say they feel, and we do not repeat the last kind, whoever says it. Reddit threads help with practical questions, such as mixing or pausing a subscription, but they are unchecked anecdotes. If you read reviews yourself, sort by most recent and read the low scores for patterns around billing or refunds.

Both declare lion's mane, cordyceps and chaga at 1,000 mg each from fruiting bodies. Brainstoorm then adds maca, acacia fibre, cacao, ashwagandha and rhodiola, for 6,225 mg of declared actives per cup, while Rainbow Dust builds on coffee.

Choose Rainbow Dust for a real cup of coffee with the caffeine of one, thousands of public reviews and a big retailer. Choose Brainstoorm for the most complete formula in our top 5, 20 mg of caffeine instead of 80 to 120 mg, the only declared dose of added fibre in our ranking and a lower price per cup. Both offer 60 days, so the choice is about caffeine and formula, not risk. If the caffeine or the price is what puts you off, our Spacegoods alternative comparison takes the switch point by point. All five are compared in our best mushroom coffee UK ranking, and our plain-English guide to mushroom coffee explains the labels.

The widest choice is on spacegoods.com: every flavour, trial packs, subscriptions and the guarantee above.

• Holland & Barrett: Rainbow Dust Coffee 240 g at a reference price of £39.00 (£1.30 a cup), shown at £31.20 on 29 September 2026 during an H&B promotion, and £27.30 on H&B's subscription. Also Chocolate, Coffee Caramel, Decaf Coffee, Vanilla Cinnamon and 7-day packs of 56 g.
• Tesco: tesco.com has product pages for Spacegoods Rainbow Dust Mushroom & Adaptogen Powder, but we could not read the price.
• Boots and Amazon: we could not verify listings or prices. On a marketplace, check the seller and the best-before date.

Spacegoods describes its 60-day guarantee for its own shop; elsewhere, read the retailer's returns policy.

Is Spacegoods legit?

Yes, in the sense that matters when you order. Spacegoods is a London-based brand that says its products are made in England and ships UK orders from Birmingham. It had 9,716 Trustpilot reviews at 4.5 out of 5 on 29 September 2026, is sold by Holland & Barrett and offers a 60-day money-back guarantee with clear conditions. Legit does not mean proven: no health claim for its mushrooms is authorised in Great Britain.

Is Spacegoods Rainbow Dust legal in the UK?

Yes, it is sold legally as a food. The Wildlife and Countryside Act 1981 protects wild lion's mane, listed as hedgehog fungus in Schedule 8, which makes picking it, or selling wild plants or products made from them, an offence in England and Wales; cultivated lion's mane is not covered. What UK rules restrict is marketing: only authorised health claims may be made, and none exists for its mushrooms.

Can you drink Rainbow Dust when pregnant?

Speak to your midwife or GP first, as Spacegoods itself advises. A serving of the coffee flavours has 80 to 120 mg of caffeine, and the NHS advises no more than 200 mg a day in pregnancy from all sources. Rainbow Dust also contains ashwagandha, which the Food Standards Agency has been reviewing since 2024, and Holland & Barrett's page says it is not intended for pregnant women.

What is a good alternative to Spacegoods?

It depends on why you want one. For less caffeine and more declared actives, Brainstoorm by Mush N Go, our No. 1, has 20 mg of caffeine and 6,225 mg of declared actives per cup at £1.27. For the lowest caffeine in our ranking, Clearly Not Coffee Original has 8 mg. If you like Rainbow Dust but not the caffeine, its Decaf flavour has under 10 mg.