• FitProbio Plus supplement bottle, front label.
  • Back label Fitties FitProbio+ supplement package with text and branding on a white background
  • Sealed nitrogen-purged foil blister pack of FitProbio+ capsules on a white background
  • Fitties FitProbio+ supplement label detail
  • Closeup of Fitties FitProbio+ on kitchen counter with fit male in the background
  • Hands sliding a blister card of Fitties FitProbio+ capsules out of its box, with FitNutrients+, FitNeuro and FitProtect bottles on a wooden table
  • Closeup of fit female holding a box of Fitties FitProbio+ on kitchen counter
1 7

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

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

$59.00
30 day supply $1.97 per day
*
    • A single clinically studied probiotic strain, HOWARU Shape B420, not a stimulant or a fat-burner
    • Researched to support healthy weight management and a healthy body composition
    • Supports gut barrier function, the gut mechanism behind its body-composition benefits
    • Delivered in acid-resistant DRcaps™ capsules designed to slow exposure to stomach acid

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.

Subscriptions renew automatically at the frequency and price you select until you cancel. Change, skip, or cancel anytime from your account.

How many boxes?
FitProbio Plus supplement bottle, front label.
Back label Fitties FitProbio+ supplement package with text and branding on a white background
Sealed nitrogen-purged foil blister pack of FitProbio+ capsules on a white background
Fitties FitProbio+ supplement label detail
Closeup of Fitties FitProbio+ on kitchen counter with fit male in the background
Hands sliding a blister card of Fitties FitProbio+ capsules out of its box, with FitNutrients+, FitNeuro and FitProtect bottles on a wooden table
Closeup of fit female holding a box of Fitties FitProbio+ on kitchen counter

  • Body outline icon indicating a body composition–related feature

    One Strain, Actually Studied

    Not a fat-burner or a stimulant. Just one probiotic strain, HOWARU Shape B420, with real human research behind it.

  • Digestive system icon indicating a gut barrier–related feature

    Built for Body Composition

    B420 is researched to support healthy weight management and a healthy body composition, working with your body, not against it.

  • Gauge icon indicating a calorie control feature of this dietary supplement

    It Starts in Your Gut

    B420 supports gut barrier function.

  • Capsule icon indicating a targeted delivery feature

    Built to Protect the Strain

    Acid-resistant DRcaps help slow exposure to stomach acid, and nitrogen-purged blister packs protect against heat, moisture, and oxygen.
Hands sliding a blister card of Fitties FitProbio+ capsules out of its box, with FitNutrients+, FitNeuro and FitProtect bottles on a wooden table

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, at 10 billion CFU per capsule, and nothing else riding along for the label.

HOWARU Shape B420

10 billion CFU of a single clinically studied probiotic strain (Bifidobacterium animalis subsp. lactis B420), formulated to support healthy weight management, a healthy 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, and artificial sweeteners.

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

What to Expect From FitProbio+

A probiotic is a daily habit, not a quick hit. Here’s the honest, gradual version.

  • Clock icon for the first phase

    From Day 1

    From your first capsule, you're taking B420 daily, the way it was studied in its human trial. This stage is about consistency, not an overnight change.

  • Calendar icon for the second phase

    Months 1-6

    Each box is 30 capsules, one a day. The human trial on B420 ran for six months of daily use.

  • Layered blocks icon for the third phase

    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

Plenty of 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
Acid-resistant DRcaps capsules
Vegetarian and dairy-free, full exclusion list on the label
FitProbio Plus supplement bottle, front label.

FitProbio+

FitProbio+

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

FitProbio+

Typical Weight-Loss Supplements

Shop

✓

Varies

✓

Varies

✓

Varies
Collection of Fitties supplement containers on a reflective surface with a gray background

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+: 21g of grass-fed whey protein per serving.
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 was studied for body composition in a six-month human trial in 225 healthy adults with a BMI of 28 to 35 (Stenman et al., 2016).

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 supports gut barrier function. In a six-month human trial, B420 was associated with lower calorie intake than placebo. FitProbio+ is formulated to support healthy weight management and a healthy body composition.

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 and store FitProbio+?

Take one capsule daily with water, any time of day. Keep closed in a cool, dry place out of reach of children. Each capsule is sealed in a nitrogen-purged blister pack to protect it from heat, moisture, and oxygen.

Is FitProbio+ vegetarian, and what does it exclude?

Yes. FitProbio+ uses acid-resistant vegetarian capsules and is dairy-free. The full exclusion list is on the label.

Can I stack Fitties products together?

Many Fitties products are designed to work together. Check each label so you don't double up on the same ingredient, such as caffeine or magnesium, and talk to your healthcare professional if you take medication. The Stack Builder can suggest a combination for your goals.

How are Fitties products made?

Every Fitties formula is manufactured in the USA in a GMP compliant facility. No low-grade shortcuts. Just ultra-premium ingredients, every one listed on the label.

Where are Fitties products manufactured?

Every Fitties formula is manufactured in the USA in a GMP compliant facility.

What are the dietary and allergen details for each product?

Each product is different, and each product page lists what that formula is formulated to exclude, word for word from its label. No Fitties formula uses artificial colors. If something doesn't fit your dietary needs, you'll know upfront.

* 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.