Our science.
Years of development built on 1,200+ research papers.
Developed with professional oversight from clinical nutritionists, dieticians, chemists, doctors and nutraceutical development experts.
Clinically informed.
Chemist built.
Did you know?
In the UK, supplements do not need to be formulated by qualified experts or independently lab tested before being sold to consumers.
Science is optional, apparently.
Research & Discovery
Built using 1,200+ academic papers, clinical research, and microbiome science.
Ingredient selection
Every ingredient is selected for a specific purpose, effective dose, and measurable benefit.
Precision formulation
Formulated as a four-layer system that accounts for absorption, interaction, and delivery.
Rigorous testing
Each production batch undergoes two rounds of lab testing for purity and safety.
Continuous innovation
Science never stands still. Neither do we. Research and feedback drive every improvement.
2.5 Years
of planning before production
13 Months
of sourcing suitable suppliers
6000+ Hours
spent building Tumble
Our key scientists
Clinical nutritionists, deititians, doctors, chemists, and more.
Becca T.
Clinical Nutritionist & Nutrition Coach
Bsc, Msc, Anutr
Becca is Tumble’s in-house nutritionist, specialising in gut and women’s health. Alongside her background in evidence-based nutrition and wellness education, she also provides personalised nutrition coaching plans to Tumble customers.
Felicia N.
Nutritionist & Dietician
Bsc, Msc, RD, NASM
Felicia is a Registered Dietitian and Nutritionist with experience across clinical nutrition, research, and evidence-based wellness, aligning closely with Tumble’s science-led approach.
Omar A.
Doctor & Nutritionist
Dr, Bsc
Omar is a doctor with experience across nutrition, fitness, and evidence-based wellness. His multidisciplinary background supports Tumble’s wider focus on practical, science-led wellbeing and consumer health education.
Nilsu N.
Clinical Dietitian
Bsc
Nilsu is a clinical dietitian with experience spanning nutrition strategy, behavioural health, and wellness education. Her science-led, consumer-focused approach aligns closely with Tumble’s focus on practical wellbeing support.
Chris T.
Naturopathic Medicine
Bsc
Chris has experience across nutraceutical product development, ingredient research, and evidence-based wellness. His background focuses on formulation strategy, functional ingredients, and regulatory-aware supplement development within the health and wellness sector.
The journey of live bacteria
From fermented products to microbiome interaction and microbial fermentation.
Humans have consumed live bacteria for thousands of years.
We evolved alongside fermented foods, before heat treatment and modern food processing and pasteurisation became the norm.
Setting the standard
None of this is required under UK law, by the way...
Our formula took years to formulate, obsessing over interaction and absorbtion.
We created Tumble as a solution to all the noise.
Supplements compete. If all ingredients ingested are not chemically formulated to function as one, they won't.
Every batch is tested upon production, and results are verified independently.
There is no requirement in the UK to do any of this. Most companies don't.
Manufactured in a GMP certified clean-room facility with HACCP safety systems.
We exclusively manafacture in the UK, above and beyond the current legal and industry standards.
Our formula evolves with the latest clincal research.
We have chemists continually reviewing the latest clinical and academic findings to ensure our formula is always built on the best information science has to offer.
42 billion CFU of researched strains.
Inulin and FOS to complement live cultures.
Targeted enzyme layer.
Including vitamin D, B vitamins and selenium.
One formula, no internal competition.
Nourishing your
microbiome
Every time you eat, you’re not just feeding yourself - you’re shaping the environment your gut bacteria live in. So what actually helps them thrive?
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Food supplements should not be used as a substitute for a varied, balanced diet and healthy lifestyle. Do not exceed the recommended daily intake. Keep out of reach of children. If pregnant, breastfeeding, taking medication, or under medical supervision, consult a healthcare professional before use. Store in a cool, dry place away from direct sunlight.
© 2026 Tumble.
Potential Adjustment Effects:
Most of what you will notice are positive changes to your metabolism, immune system, energy, skin and overall wellbeing.
So don't panic if your body goes through an adjustment period as it adapts to our formulation.
Bright yellow wee: Totally harmless and normal for many, happens for the same reason as Berocca. This is due to our high vitamin B2 (riboflavin) content. Like all B vitamins, any excess is naturally excreted once your body has absorbed what it needs.
Digestive changes/bloating: No cause for concern. Our formula is potent and comprehensive — your body may take time to adjust to our live cultures, fibres, enzymes and micronutrients. Reducing your dose temporarily may help.
Mild digestive sensitivity: Some individuals may experience mild discomfort when first starting. This typically resolves quickly. Simply halve your dose until you have adjusted.Changes in digestive patterns: Temporary changes in frequency or consistency can occur as your system adapts.
Allergen information:
Contains: Gluten (Wheat).
Scientifically recognised nutrient contributions:
Gut
1. Riboflavin contributes to the maintenance of normal mucous membranes (e.g. intestinal mucosa). Biotin contributes to the maintenance of normal mucous membranes (e.g. intestinal mucosa).
Energy
2. Riboflavin, thiamine, vitamin B6, vitamin B12 and biotin contribute to normal energy-yielding metabolism. Riboflavin, vitamin B6 and vitamin B12 contribute to the reduction of tiredness and fatigue.
Immunity
3. Vitamin D, vitamin B6, vitamin B12 and selenium contribute to the normal function of the immune system.
Brain
4. Thiamine, riboflavin, vitamin B6, vitamin B12 and biotin contribute to normal psychological function and the normal functioning of the nervous system.
Metabolism
5. Biotin contributes to normal macronutrient metabolism. Vitamin B6 contributes to normal protein and glycogen metabolism. Riboflavin contributes to the normal metabolism of iron. Vitamin B6 contributes to normal cysteine synthesis.
Skin, Hair & Nails
6. Biotin contributes to the maintenance of normal skin and hair. Riboflavin contributes to the maintenance of normal skin. Selenium contributes to the maintenance of normal hair and nails.
Hormonal Activity
7. Vitamin B6 contributes to the regulation of hormonal activity.
Cell Devision & Blood Formation
8. Vitamin B12 contributes to normal red blood cell formation and has a role in the process of cell division. Vitamin B6 contributes to normal red blood cell formation. Vitamin D has a role in the process of cell division.
Heart & Homocysteine Metabolismal
9. Thiamine contributes to the normal function of the heart. Vitamin B6 and vitamin B12 contribute to normal homocysteine metabolism.
Bones, Teeth & Muscle Function
10. Vitamin D contributes to the maintenance of normal bones, teeth and muscle function, to normal blood calcium levels and to normal absorption/utilisation of calcium and phosphorus.
Thyroid & Reproductive Health
11. Selenium contributes to normal thyroid function and normal spermatogenesis.
Protection of Cells
12. Riboflavin, vitamin E and selenium contribute to the protection of cells from oxidative stress.