FitProbio+ | Ultra-Premium Weight Management Probiotic with HOWARU® Shape B420™

Name: FitProbio+
Brand: Fitties
SKU: BIO-LEAN-C30
Price: 59.00 USD
Availability: InStock

No stimulants, no fat-burner promises. FitProbio+ supports weight management from the gut up.

$59.00

30 servings | $1.96/serving

*

A single clinically studied probiotic strain, HOWARU Shape B420, not a stimulant or a fat-burner
Researched to support healthy weight management and a leaner body composition
Supports gut barrier function, the gut mechanism behind its body-composition benefits
Delivered in acid-resistant capsules, so the strain survives your stomach and reaches your gut

FitProbio+ is a weight-management probiotic built on one clinically studied strain, HOWARU Shape B420, researched to support healthy body composition and weight management through the gut.

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One Strain, Actually Studied
Not a fat-burner or a stimulant. Just one probiotic strain, HOWARU Shape B420, with real human research behind it.
Built for Body Composition
B420 is researched to support healthy weight management and a leaner body composition, working with your body, not against it.
It Starts in Your Gut
B420 supports gut barrier function, which researchers increasingly link to body composition. Weight management starts in your gut.
Probiotics That Survive the Trip
Most probiotics die in stomach acid. Acid-resistant DRcaps™ and nitrogen-purged packing help the strain survive the trip to your gut.

Overhead view of fit female removing packet from box of Fitties FitProbio+

The Weight-Loss Aisle Runs on Hype. This Runs on a Trial.

There’s a reason the weight-loss aisle has a credibility problem: it’s mostly caffeine in a new wrapper, proprietary "fat-burner" blends, and claims invented by a marketing team. FitProbio+ has none of that. It’s one probiotic strain with an actual human trial, working through your gut rather than your nervous system. B420 supports gut barrier function and a healthy body composition, gradually, the way real biology works, not with a stimulant jolt that wears off by mid-afternoon. No jitters, no crash, nothing to taper off.

Who FitProbio+ Is For

Built for people supporting healthy weight management who are done with stimulants and gimmicks.

Who It’s For:
Anyone supporting healthy weight management who’s finished with stimulants and fat-burner gimmicks
People who want a gut-first approach to body composition, backed by real research
Who It’s Not For:
Anyone after a quick fix or a stimulant kick, since this is a probiotic that works gradually through your gut
Anyone expecting results without the basics, since a probiotic supports healthy weight management, it doesn’t replace a reasonable diet and movement

What’s Inside

One strain, clinically studied, properly dosed, and nothing else riding along for the label.

HOWARU Shape B420

10 billion CFU of a single clinically studied probiotic strain (Bifidobacterium lactis B420), researched in a human trial to support healthy weight management, a leaner body composition, and gut barrier function.

Formulated to exclude: wheat, gluten, soy, animal and dairy products, fish, shellfish, peanuts, tree nuts, egg, ingredients derived from genetically modified organisms (GMOs), artificial colors, artificial sweeteners, and artificial preservatives.

Other ingredients include: microcrystalline cellulose, acid-resistant capsule (hypromellose, gellan gum, and water), ascorbyl palmitate, and silica.

What to Expect From FitProbio+

A probiotic works by building up, not by hitting fast. Here’s the honest, gradual version.

From Day 1
From your first capsule, B420 starts establishing in your gut. Probiotics work by building up over time, so this stage is about consistency, not an overnight change.
Months 2-6
In the clinical research, body-composition changes showed up gradually over months, measured at two, four, and six. This is a slow, cumulative process, not a quick one.
Ongoing
Gut and weight-management support work best as a daily habit alongside a reasonable diet and regular movement, not as a standalone fix.

Closeup of Fitties FitProbio+ on kitchen counter with fit male in the background

How to Use FitProbio+

Take 1 capsule
With water, once a day

Every day, one capsule. Consistency is how probiotics work. Any time of day, with or without food. Pick a time you’ll remember and keep to it. If you’re immunocompromised or taking medication, check with your healthcare provider before use.

Pro Tip: Probiotics reward consistency. The research ran on daily use over months, so the habit matters more than the hour.

How FitProbio+ Compares

Most weight-loss supplements lean on stimulants, proprietary "fat-burner" blends, and promises no study would back. FitProbio+ is one clinically studied strain with a human trial behind it. The difference is whether there’s any science at all.

A single clinically studied probiotic strain

A human trial on body composition

No stimulants, no caffeine, no crash

Acid-resistant delivery so the strain survives

Vegetarian, allergen-friendly, no artificial junk

FitProbio+

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Four white pill bottles of different sizes on a light gray background

FitProbio+

Typical Weight-Loss Supplements

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Rarely

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Varies

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What People Notice About FitProbio+

See what people are saying

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Where FitProbio+ Fits Your Stack

FitProbio+ supports body composition from the gut. Pair it with the foundation and the rest of a real routine.

FitNutrients+: the daily vitamin and mineral foundation under everything.
FitWhey+: complete protein to support satiety and lean body composition.
FitFast: glycemic support, the metabolic companion to a body-composition routine.

Find Your Stack

Frequently Asked Questions

What is HOWARU Shape B420?

HOWARU Shape B420 is a specific, patented probiotic strain (Bifidobacterium animalis subsp. lactis B420). FitProbio+ provides 10 billion CFU of it per capsule. It’s one of the few probiotic strains studied specifically for body composition in a human trial.

What does FitProbio+ do?

FitProbio+ is formulated to support healthy weight management, a healthy body composition, and gut barrier function in generally healthy people, using a single clinically studied probiotic strain.

How does a probiotic support body composition?

B420 works through the gut. It supports gut barrier function, and in research it was associated with people naturally taking in somewhat fewer calories, likely through gut signaling that influences appetite. The result researchers measured was support for a healthier body composition over time.

Is FitProbio+ a stimulant or a fat-burner?

No. FitProbio+ contains no stimulants, no caffeine, and no "fat-burner" ingredients. It’s a single probiotic strain that supports healthy weight management by working through your gut, not by stimulating your system.

How long does FitProbio+ take to work?

Probiotics work gradually. In the clinical research, body-composition changes were measured over several months, at two, four, and six. Consistent daily use is how the strain was studied and how it’s meant to be taken.

Do I need to change my diet and exercise with FitProbio+?

FitProbio+ is designed to support healthy weight management, but like any supplement, it works best as part of a healthy routine. We’d always suggest pairing it with a reasonable diet and regular movement. It’s there to support your efforts, not replace them.

How do I take FitProbio+, and does it need refrigeration?

Take one capsule daily with water, any time of day. It doesn’t need refrigeration, the acid-resistant capsules and nitrogen-purged packaging are designed to keep the strain stable and deliver it through stomach acid to your gut.

Is FitProbio+ vegetarian and allergen-friendly?

Yes. FitProbio+ uses vegetarian, acid-resistant capsules and is made without gluten, soy, dairy, GMOs, and artificial additives.

Can I stack Fitties products together?

Yes. All Fitties supplements are formulated with complementary ingredient profiles, so they can be used as part of the same daily routine. If you want a ready-made stack, our curated bundles pair the right products for strength, performance, recovery, and overall health so you don't have to guess.

How are Fitties products tested?

Every Fitties formula is manufactured in an NSF-certified GMP facility and tested for purity, potency, and identity. No low-grade shortcuts. Just ultra-premium, research-backed ingredients, every one listed on the label.

Where are Fitties products manufactured?

Every Fitties formula is manufactured in the USA, at a cGMP-compliant, FDA-registered facility in Orlando, Florida. We don’t outsource quality. We build everything to the highest standard because your health and performance deserve nothing less.

Are Fitties supplements vegan, gluten-free, or allergen-friendly?

Each product is different, and we call out all dietary details clearly on every product page. Many formulas are vegan, gluten-free, dairy-free, or soy-free, and we never use artificial dyes or cheap fillers. If something doesn’t fit your dietary needs, you’ll know upfront.

What Real Users Are Saying

Reviews from athletes and high performers who expect to get what they pay for in their supplements.

* These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.