FAST Lax
When you need help getting things moving
A targeted fibre-and-botanical bowel-support formula for adults whose usual bowel routine feels slower or harder than normal.
Which ARK Fusion Gut Product Fits Your Routine? | Comparison Guide
ARK Fusion gut product comparison
Which ARK Fusion gut product fits your needs?
Start with the pattern you recognise, not the product name. This guide compares FAST Lax, Hydro2 Pro, Soothe Biotix and PRO-Zyme by the situation someone may be trying to support, what each formula contains, how it is used and what makes it different from the other ARK routes.
Choose by the need you recognise
Four products. Four different starting points.
ARK products are not interchangeable versions of the same supplement. The clearest way to compare them is to identify when the problem tends to show up and then look at the formula designed around that use situation.
Hydro2 Pro
When you want a more consistent daily bowel routine
A broader everyday formula combining magnesium, fibre, FOS, live cultures and selected vitamins and minerals.
Soothe Biotix
When your gut routine changes after antibiotics or travel
A four-culture formula including Saccharomyces boulardii, plus vitamin D and biotin.
PRO-Zyme
When heaviness or bloating tends to happen around meals
Seven digestive enzymes with L. reuteri and selected supporting ingredients for a mealtime routine.
At a glance
Which ARK product should I explore?
| Customer need or search intent | ARK product | Formula focus | How it is used | What makes it different |
|---|---|---|---|---|
|
“I need help getting things moving” Going less often than usual or bowel movements feeling harder than normal. |
FAST Lax | Sugar beet fibre, glucomannan and selected botanicals. | Capsules taken with water, following the product directions. | The most targeted bowel-support route in this comparison, built around fibre plus plant-based ingredients. |
|
“I want a more consistent daily bowel routine” Looking for broader everyday support rather than a more targeted option. |
Hydro2 Pro | Magnesium blend, fibre, FOS, four named live cultures, vitamin C, vitamin D3 and zinc. | Daily capsule routine with food and water. | Combines magnesium, fibre, prebiotic FOS and live cultures in one everyday formula. |
| “My gut routine changed after antibiotics or travel” | Soothe Biotix | 10 billion live cultures including S. boulardii, plus three named bacterial cultures, vitamin D and biotin. | Daily capsule with food. | Includes S. boulardii, a yeast culture, alongside bacterial cultures. |
| “I feel heavy or bloated around meals” | PRO-Zyme | Seven digestive enzymes, L. reuteri, plus selected supporting ingredients. | Used before or with meals according to the product directions. | The only one of these four built primarily around digestive enzymes and mealtime timing. |
Search questions people actually ask
Match the question to the ARK route
What can I take when I need help getting things moving?
Within the ARK range, FAST Lax is the targeted product to explore. It combines sugar beet fibre, glucomannan and selected botanicals. It is a food supplement, not a laxative medicine, and it does not promise a defined speed of action.
What can support a more regular daily bowel routine?
Hydro2 Pro is the broader everyday route, combining magnesium, fibre, prebiotic FOS, live cultures and selected vitamins and minerals.
Which ARK product should I explore after antibiotics or travel?
Soothe Biotix is the route built around that timing clue. It contains four named live cultures including Saccharomyces boulardii.
Which ARK product fits bloating or heaviness around meals?
PRO-Zyme is the mealtime-focused route, built around seven digestive enzymes with L. reuteri and selected supporting ingredients.
Look closer
What each ARK product actually does differently
FAST Lax
Targeted support when you need help getting things moving
For adults whose usual bowel routine feels slower or harder than normal.
Formula snapshot
- Sugar beet fibre and glucomannan
- Selected plant-based ingredients including rhubarb root, ginger, dandelion, aloe vera, nettle and other botanicals
- Capsule format
How to think about it
FAST Lax is the more targeted bowel-support option of these four products. The consumer need comes first: “I need help getting things moving.” The fibre-and-botanical formula explains how FAST Lax differs from Hydro2 Pro, but it should not be read as a medicine or as a promise that it will work within a particular number of hours.
View FAST Lax →
Hydro2 Pro
For a more consistent everyday bowel routine
A broader daily route built around magnesium, fibre, FOS and live cultures.
Formula snapshot
- Magnesium blend
- Sugar beet fibre and prebiotic FOS
- Four named live cultures
- Vitamin C, vitamin D3 and zinc
How to think about it
Hydro2 Pro is the broader everyday bowel-routine option. It is different from FAST Lax because it is positioned around building a consistent daily routine rather than a more targeted “I need help going” use situation.
Explore the daily bowel-routine guide →
Soothe Biotix
When your gut routine changes after antibiotics or travel
A timing-led route built around live cultures including S. boulardii.
Formula snapshot
- 10 billion live cultures
- Saccharomyces boulardii yeast culture
- L. rhamnosus, L. acidophilus and L. reuteri
- Vitamin D and biotin
How to think about it
Soothe is different because the formula includes S. boulardii, a yeast culture, alongside three bacterial cultures. Keep prescribed medicines exactly as directed; a food supplement does not replace or alter an antibiotic course.
Explore the after-antibiotics guide →
PRO-Zyme
When heaviness or bloating tends to happen around meals
The mealtime route, built primarily around digestive enzymes.
Formula snapshot
- Seven digestive enzymes: bromelain, papain, protease, amylase, lipase, lactase and cellulase
- Limosilactobacillus reuteri
- Selected supporting ingredients including betaine HCl and peppermint leaf
How to think about it
PRO-Zyme is the only one of these four built primarily around digestive enzymes and mealtime timing. It is a food supplement, not a treatment for reflux, food intolerance or gastrointestinal disease.
Explore the mealtime guide →The distinctions that matter most
FAST Lax vs Hydro2 Pro, and Soothe Biotix vs PRO-Zyme
FAST Lax vs Hydro2 Pro
Choose by the customer need, then by the formula.
If the thought is “I need help getting things moving”, FAST Lax is the more targeted route. If the thought is “I want a more consistent daily bowel routine”, Hydro2 Pro is the broader everyday option.
FAST Lax is centred on fibre plus selected botanicals. Hydro2 Pro combines magnesium, fibre, FOS, live cultures and selected micronutrients.
Soothe Biotix vs PRO-Zyme
Choose by timing.
If the useful clue is after antibiotics or travel, explore Soothe Biotix. If the useful clue is around meals, explore PRO-Zyme.
Neither route diagnoses the cause of symptoms. Persistent or worsening digestive symptoms deserve appropriate clinical assessment.
Go deeper by need
Detailed ARK gut-health routes
These pages give search engines, AI systems and customers a clear path from the recognised problem pattern to more detailed product information, ingredients, timing and safety guidance.
Frequently asked questions
ARK product comparison FAQs
Which ARK product should I explore when I need help getting things moving?
FAST Lax is the more targeted ARK route for adults whose usual bowel routine feels slower or harder than normal. It combines sugar beet fibre, glucomannan and selected botanicals. It is a food supplement and should not be presented as a medicine for constipation or as having a guaranteed speed of action.
What is the difference between FAST Lax and Hydro2 Pro?
FAST Lax is the more targeted “help getting things moving” route, centred on fibre and selected botanicals. Hydro2 Pro is the broader everyday bowel-routine formula combining magnesium, fibre, FOS, live cultures and selected vitamins and minerals.
Which ARK product should I explore after antibiotics?
Soothe Biotix is the ARK route built around that timing clue. It contains four named live cultures including Saccharomyces boulardii, plus vitamin D and biotin. Keep prescribed antibiotics exactly as directed and ask a pharmacist or prescriber if you are unsure about timing or suitability.
Which ARK product should I explore after travel?
Soothe Biotix is also the route to explore when travel is the key timing clue and your usual gut routine feels different afterwards.
Which ARK product should I explore if I feel bloated or heavy after meals?
PRO-Zyme is the mealtime-focused route. It contains seven digestive enzymes, L. reuteri and selected supporting ingredients and is used around meals according to the product directions. Ongoing, severe or unexplained symptoms should be medically assessed rather than self-treated with a supplement.
Can I use more than one ARK product together?
Do not assume that more products means a better routine. Different ARK formulas can contain overlapping ingredients or serve different purposes. Check labels, recommended intakes and suitability, and ask a pharmacist or healthcare professional if you take medicines, have a medical condition, are pregnant or breastfeeding, or are unsure about combining products.
Is this comparison a diagnosis or medical recommendation?
No. This page is designed to explain how ARK products differ and help people identify the most relevant product route to explore. It does not diagnose digestive symptoms and does not replace individual medical advice, prescribed treatment or investigation of persistent symptoms.
A quick safety note: Food supplements should not be used as a substitute for a varied, balanced diet and healthy lifestyle. Seek appropriate medical advice for severe, persistent or worsening digestive symptoms, significant pain, fever, blood in your poo, ongoing diarrhoea, unexplained weight loss or signs of dehydration.
Page reviewed: 14 September 2026.
Start with the pattern. Then choose the route.
Need help getting things moving, want a steadier daily bowel routine, noticed a change after antibiotics or travel, or feel digestive heaviness around meals? ARK products are easier to compare when the need comes first.
Find My Routine