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ProbioSlim Review: A Comprehensive Look at Its Effectiveness and Safety

Written by Melissa Mitri, MS, RD

Reviewed by Anthony Dugarte, MD 

Last Updated on May 12, 2021

Dietitian Rating:


About This Rating
The average rating of this product is calculated based on the evaluation of the following factors:
  • Support for Claims:3.0
  • Ingredient Safety:3.0
  • Value for the Price:3.0
  • Brand Transparency:4.0

ProbioSlim is a dietary supplement intended to ease digestive symptoms and support weight loss. Due to its probiotic content, this supplement may help to reduce digestive symptoms. However, there is not enough evidence to back up its weight-loss claims.

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ProbioSlim Review: A Comprehensive Look at Its Effectiveness and Safety
Photo by WellnessVerge


  • Some ingredients are evidence-based
  • Provides antioxidants and beneficial fibers
  • Price is reasonable for a 30-day supply


  • Limited evidence for weight loss claims
  • Limited evidence for probiotic strain effectiveness
  • Potential safety concerns of EGCG Green Tea Extract

What Is ProbioSlim?

ProbioSlim is a dietary supplement designed to ease digestive woes, replenish good bacteria, and support weight loss.

The claims are that this product helps promotes healthy digestion, replenishes good bacteria, and helps you to lose weight.

Additional claims are that the main compound present, called LactoSpore, can ease symptoms associated with occasional diarrhea, constipation, gas, and bloating.

ForceFactor, the manufacturer of this product, is a global performance nutrition brand that claims all of its product formulations are based on the latest science.

The instructions for use are 2 ProbioSlim capsules per day – 1 with breakfast and 1 with lunch.

This supplement contains both probiotic and prebiotic ingredients as well as weight loss aids. Probiotics and prebiotics work together but are not the same.

Probiotics are live bacteria that help support our health. The more live, “good” probiotic bacteria we have, in theory, the more it helps reduce the bad types of bacteria.

Prebiotics are a type of fiber that feeds the probiotic bacteria and helps them grow.

This supplement blend also claims to reduce your weight as a result of it containing green tea leaf extract (EGCG) and caffeine.

Evaluation of ProbioSlim Ingredients

The four core ingredients in ProbioSlim are part of a complex called the Whole Health Superblend. This complex contains a total dose of 541 milligrams.

In taking a closer look at the evidence, here is a summary of what I’ve found on the health claims:

LactoSpore (Probiotic)

LactoSpore Bacillus coagulans is the probiotic strain present in this supplement. Probiotics are thought to support digestive health, one of the claims for this product.

The manufacturer claims that the specific strain LactoSpore is well absorbed because it is designed to survive the high acidity in your stomach.

Bacillus bacteria are present naturally in our intestinal tract. A 2016 study showed some evidence that Bacillus coagulans may reduce diarrhea in those with irritable bowel syndrome (IBS).

Another 2014 randomized controlled trial also showed benefit in taking Bacillus coagulans in IBS patients.

Regarding weight loss, there are no specific studies done on Bacillus coagulans. Research that directly links weight loss with taking probiotics is also scarce.

For example, a 2015 research review showed that there might be a relationship between an unbalanced microbiome and obesity, but it does not prove this is the direct cause of obesity.

This ingredient is also under the category of Generally Recognized As Safe (GRAS). To achieve GRAS status, an ingredient is thoroughly evaluated by qualified experts and deemed safe when used as intended.

While this ingredient shows promise in improving IBS symptoms, the research is limited regarding it supporting digestion in the general population. 

Additionally, there is no data supporting this ingredient for weight loss.

Super EGCG Green Tea Leaf Extract

EGCG, or epigallocatechin gallate, is an antioxidant present naturally in green tea.

EGCG has been studied for its potential role in fat metabolism and weight loss. However, the quality of the data to prove this has been mixed.

For example, a 2014 research review showed promise in EGCG’s anti-obesity effects.

Alternatively, another 2013 review showed varying results in its role in fat metabolism and fat-burning potential.

Dr. Oz had promoted EGCG heavily as a weight loss aid on his show. However, those claims were later rescinded as there was limited scientific evidence to support them.

EGCG may hold the potential to support weight loss and metabolism, but more research is needed to determine the proper dose needed.

It is also unclear how much EGCG is present in ProbioSlim, as it is part of a complex.


Caffeine, in moderation, has antioxidant properties and may support a healthy metabolism.

A systematic review and meta-analysis were done to investigate caffeine’s role in weight loss.

This study demonstrated that regular caffeine intake might promote a lower weight, BMI, and body fat reduction.

This effect was also dose-dependent, meaning the more caffeine consumed, the greater the likelihood of weight loss.

Another large study showed that those consuming more caffeinated beverages were also able to maintain weight loss better.

While caffeine may have some weight-loss benefits, everyone has a different tolerance to caffeine’s effects.

Probioslim Capsules
Probioslim capsules. Photo by WellnessVerge

Prebiotic Fruit Extracts

Prebiotics are plant fibers that help feed the beneficial bacteria (probiotics) in your gut.

Some research has shown consuming prebiotics can support digestive health, especially when various types are consumed.

ProbioSlim contains 3 prebiotic fruit extracts – kiwi, fig, and papaya.

A comprehensive research review also found that taking a synbiotic supplement that contains both probiotics and prebiotics may support weight loss.

However, this was the case with supplements containing Lactobacillus strains, not Bacillus strains like ProbioSlim.

Additionally, any of this prebiotics can also be found in adequate amounts through your diet.

Consuming them in your diet may produce a greater benefit, as they are combined with other beneficial nutrients in that food.

The research is stronger regarding prebiotics and digestive health rather than weight loss.

It does have the potential to support weight loss as well, but more research is needed on the dosage and variety of sources.

Verdict on Claimed Benefits

Below is our summary of the available evidence for the claimed benefits of ProbioSlim based on the available research:

Promotes healthy digestionModerate Evidence
Replenishes good bacteriaModerate Evidence
Supports weight lossModerate Evidence

Side Effects and Safety

There are some specific concerns regarding the safety of the ingredients. 

This supplement contains probiotics, which are generally recognized as safe. However, some people experience mild side effects, according to a 2010 research review.

For example, some experience gas, bloating, or diarrhea, especially when first taking them. This often decreased after the first week or so after taking it.

Additionally, those who are immunocompromised may be at an increased risk of infection when taking probiotics.

This product is also a stimulant-containing supplement as it contains caffeine.

The caffeine amount is also in unknown quantities as part of a complex. For those who are caffeine-sensitive, it is unclear how they may react.

According to the FDA, The upper limit for caffeine intake for the general population is 400 mg per day.

The FDA also warns against consuming more than 1,200 mg of caffeine per day, as this could cause more serious side effects such as seizures.

A 2017 research review found that moderate caffeine consumption is relatively safe.

However, for some vulnerable populations, caffeine consumption could be harmful, including impairments in cardiovascular function, sleep, and substance use.

If you are also consuming caffeinated beverages such as coffee, tea, or soda in addition to this supplement, it may bring you to an unsafe range.

Lastly, this supplement contains EGCG green tea leaf extract. A safe dose of this ingredient has not yet been clearly identified. 

There have been rare reports of liver injury from consuming green tea extracts in doses of 800 mg per day or higher.

While this is a higher dose than what is present in this product, it is still important to note.

Always consult with your medical provider before starting this or any supplement, especially if you are caffeine-sensitive.

Cost and Where to Buy

The best place to purchase this product is through Walmart. ForceFactor ProbioSlim costs only $19.88 on Walmart.com for a 60-day supply, compared to at least $40 from other websites like Amazon, Vitamin Shoppe, or GNC.

This product is not available directly from the manufacturer’s website.

The return policy for this product depends on where it is purchased.

Based on our review of return policies, Walmart has the best one – a 90-day money-back guarantee on all purchased products, including applicable fees.

Related: Best Probiotics of 2022, According to Dietitians

How ProbioSlim Compares to Alternatives

There are many probiotic and prebiotic supplements available in the market. The most extensively studied probiotic strains are Lactobacillus and Bifidobacterium, which ProbioSlim does not contain.

The strain Bacillus coagulans present in ProbioSlim has not yet been studied as extensively as other strains.

ForceFactor promotes ProbioSlim as unique since it contains Bacillus coagulans, which can survive the harsh environment in the stomach. This, in theory, improves absorption.

However, more research and larger studies are needed to confirm the role Bacillus coagulans plays in digestive health.

Additionally, although it is marketed as a weight-loss supplement, the ingredients have not been proven to work for that purpose.

While there are numerous probiotic supplements on the market, not many contain ProbioSlim’s ingredient blend.

If your main purpose of taking a probiotic supplement is to improve digestion, I would suggest a product containing Lactobacillus or Bifidobacterium, such as Culturelle Digestive Health, since there is more research on these strains.

The Bottom Line

Due to its probiotic content, using ProbioSlim may improve digestive symptoms.

However, I believe there are better probiotic blends available on the market, such as ones containing Lactobacillus or Bifidobacterium strains that are more extensively researched.

There may be some potential for weight loss due to the caffeine content, but there are also safety risks associated with too much caffeine.

If you are caffeine sensitive or are at risk for cardiovascular disease, I would not recommend taking this supplement.

Regardless of your medical history, always consult with your medical provider before starting ProbioSlim or any new supplement regimen.

A Word from Our RD

As a registered dietitian, I would suggest first getting your probiotics from fermented food like yogurt, kimchi, or kombucha.

I would also encourage a diet rich in prebiotic fibers with a variety of fruits and vegetables for optimal digestion.

If you experience digestive concerns and are also trying to lose weight, identifying the underlying cause of your health issues would be the first step.

I would recommend adopting a healthy diet and exercise regimen as a first-step approach to losing weight.

I would suggest working with a health professional such as a doctor or registered dietitian and then identifying if a supplement is needed.

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