Are these microbiome tests worth the money?

ZOE: yes if you want a structured personalisation programme with real research backing, especially if you can use the CGM phase to learn your post-meal glucose patterns. Viome: less so for most people; the recommendations are more aggressive and less validated. Neither is essential for someone already eating well.

How accurate are the food recommendations?

ZOE's recommendations are derived from how individuals in the PREDICT cohorts responded to specific foods. The translation to your individual case is reasonable but imperfect. Viome's recommendations come from a proprietary AI algorithm with less peer-reviewed validation. Neither should be treated as gospel.

Is the CGM in ZOE useful?

Often the most valuable part. Two weeks of CGM data shows your personal post-meal glucose curves. You learn which combinations spike you and which don't. That's directly actionable. Many people find this more useful than the microbiome data.

What about other microbiome tests?

Tiny Health (focused on infants and pregnancy), BiomeSight (cheaper 16S, no subscription), Atlas Biomed (UK-based, includes DNA traits) are all reasonable alternatives. Each has trade-offs. See our microbiome test glossary entry for the full landscape.

ZOE vs Viome

4 min readUpdated 2026-04-26By Selin Talishinska

Both companies offer microbiome-based personalised nutrition programmes. ZOE is the most clinically validated consumer test, combining stool sequencing with blood lipid response and CGM data, run from the UK. Viome uses RNA sequencing (claims to measure microbial activity, not just composition) and AI-driven food recommendations. ZOE has stronger trial evidence; Viome has more aggressive marketing claims. For most people, ZOE is the more rigorous choice; Viome is the more aggressive recommendation engine.

Both ZOE and Viome want to tell you what to eat based on your gut. Their methods, their evidence, and their tone differ significantly. If you're spending £200-£300 on a microbiome programme, this is the comparison that matters.

What each does

ZOE

Founded by Tim Spector (King's College London epidemiologist who runs the British Gut Project). Based on the PREDICT studies, large-scale research that measured how individuals respond differently to the same foods. The ZOE test combines a stool microbiome sample with a blood fat response test and 2 weeks of continuous glucose monitoring (CGM). The output is personalised food scores from 0-100 telling you which foods suit your specific metabolic and microbial profile.

Viome

Based in Washington State, US. Uses metatranscriptomic (RNA) sequencing of stool, claiming to measure what microbes are doing rather than just what's there. Reports include 'gut intelligence', 'cellular wellness', and 'metabolic health' scores. Algorithm produces food and supplement recommendations. Owned by parent company Viome Life Sciences which sells personalised supplements.

Side by side

	ZOE	Viome
Country of origin	UK (also US)	US
Test components	Microbiome + blood fats + CGM	Microbiome RNA sequencing only
Sequencing	Shotgun metagenomics	Metatranscriptomics (RNA)
Cost (UK, 2026)	~£295 + £25/month subscription	$229-399 depending on test depth
Trial evidence	PREDICT 1, PREDICT 2, METHOD trial	Internal validation studies, fewer independent
Output	Personalised food scores 0-100	Food and supplement scores, plus 'wellness' metrics
Subscription required	Yes, for ongoing app and reports	Yes, especially for supplement plans
Best for	Evidence-led personalised eating	Maximum data and recommendation volume

What ZOE does well

Genuine clinical research backing. The PREDICT studies have been peer-reviewed and published in Nature Medicine.
Triple data source (microbiome + blood fats + CGM) makes the personalisation more meaningful than microbiome alone.
British dietary defaults familiar to UK users.
Strong app coaching and educational content built around the test.
Tim Spector's gut-health communication is reliably evidence-led across his books and podcasts.

Where ZOE is limited

Day-to-day microbiome variation isn't captured by a single test.
Food scores reflect averages from research populations, not your personal cause-and-effect responses.
Recommendations can feel generic even with the personalisation. 'Eat more polyphenols' applies to almost everyone.
Subscription costs add up if you stay long-term.
Some scoring decisions are opinionated (e.g. ZOE penalises seed oils more than current evidence supports).

What Viome does well

RNA sequencing technically measures activity not just presence, a real distinction.
More granular reports with more individual food recommendations.
Useful for people who want a lot of data and recommendations.
Includes supplement plans for people who want them.

Where Viome is limited

Less independent validation of the AI recommendation engine. Most validation is internal company research.
Aggressive supplement upsells. The personalised supplement product is the high-margin piece.
Recommendations sometimes contradict mainstream nutrition advice in ways that aren't well-explained (e.g. 'avoid spinach').
RNA degrades fast in stool. Sample handling is unusually critical for valid results.
The 'wellness scores' are constructed metrics, not validated clinical endpoints.

Which to pick

Evidence-led, want trial-backed personalisation: ZOE.
Already eat well and want to understand your individual response patterns: ZOE (the CGM data is the best part).
Want maximum data and don't mind aggressive supplement upselling: Viome.
On a tight budget: neither. £80 for a registered dietitian session and a fibre-tracking habit gets you 80 percent of the value.
Diagnostic concern (suspect IBS, IBD, food intolerance): see a gastroenterologist before either.

What both do poorly

Day-to-day variability. Both are snapshots, not trends.
Specific clinical conditions. Neither diagnoses anything.
Long-term outcomes. There are no long-term studies showing that following either company's recommendations improves objective outcomes (CV events, diabetes incidence, all-cause mortality).
Replacing food-first basics. The Mediterranean diet plus 30 g fibre plus regular movement and 7+ hours of sleep does more for your gut than any test, ZOE or Viome.

Common questions

Are these microbiome tests worth the money?: ZOE: yes if you want a structured personalisation programme with real research backing, especially if you can use the CGM phase to learn your post-meal glucose patterns. Viome: less so for most people; the recommendations are more aggressive and less validated. Neither is essential for someone already eating well.
How accurate are the food recommendations?: ZOE's recommendations are derived from how individuals in the PREDICT cohorts responded to specific foods. The translation to your individual case is reasonable but imperfect. Viome's recommendations come from a proprietary AI algorithm with less peer-reviewed validation. Neither should be treated as gospel.
Is the CGM in ZOE useful?: Often the most valuable part. Two weeks of CGM data shows your personal post-meal glucose curves. You learn which combinations spike you and which don't. That's directly actionable. Many people find this more useful than the microbiome data.
What about other microbiome tests?: Tiny Health (focused on infants and pregnancy), BiomeSight (cheaper 16S, no subscription), Atlas Biomed (UK-based, includes DNA traits) are all reasonable alternatives. Each has trade-offs. See our microbiome test glossary entry for the full landscape.