ProbioSlim Review - Safety, Ingredients, Does It Work?

By Anthony Dugarte, M.D., C.S.C.S
Updated on: Mar 2, 2020

What is ProbioSlim?

ProbioSlim from Force Factor is a probiotic containing a blend of ingredients that will allegedly improve digestion and support weight loss.

In fact, according to their site, taking 1 capsule of ProbioSlim twice daily will:

  • Relieve diarrhea
  • Reduce Constipation
  • Alleviate gas
  • Minimize bloating
  • Increase the growth of beneficial bacteria
  • Reduce harmful bacteria
  • Support weight loss

This is a tall order for any supplement, though these claims are not unusual for those that include probiotics.

These are the friendly bacteria that form your microbiome - the network of microorganisms within your gut. Probiotics differ from harmful bacteria in that they can offer a wide variety of health benefits.

ProbioSlim claims to support the actions of their probiotic with other ingredients to offer the maximum benefits.

In this article, we’ll dive into the scientific support for ProbioSlim’s ingredients to see if there is any merit to Force Factor’s claims.

What Are The Ingredients?

While the probiotic is the star of this supplement, there are many ingredients Force Factor includes in supporting roles. The combination of these ingredients may contribute to ProbioSlim’s proposed benefits.

Each capsule of ProbioSlim contains a total of 541mg of their Whole Health Superblend:

LactoSpore Bacillus Coagulans

This probiotic is thought to improve diarrhea, constipation, gas, and bloating. While the company shares the specific strain in their supplement, they do not detail the quantity they include.

We can get a sense of what this strain has to offer from the handful of available studies, though we are unable to determine if ProbioSlim has a large enough dose to be effective.

Force Factor claims that LactoSpore is designed to survive the harsh environment of your stomach to get to the intestines and exert its benefits. This seems to be in line with the scientific support for this strain.

A recent randomized trial demonstrated the ability of LactoSpore to improve symptoms of irritable bowel syndrome (IBS) in subjects with depression.

Those treated with LactoSpore at a daily dose of 2 billion CFU over 3-months improved digestive symptoms and reduced lab values for inflammation.

Though limited, there is available support for the proposed actions of LactoSpore. Keep in mind that although benefits were seen in subjects with Irritable bowel syndrome (IBS), this does not necessarily mean that healthy individuals will benefit from use.

Green Tea Leaf Complex

Used for centuries in natural medicine, it Green Tea Lead Complex may boost energy and spark weight loss.

These effects are likely related to its caffeine and catechin content.

The combination of 200mg of caffeine and green tea at 90, 200, 300, and 400mg doses up to 3x daily all seemed to boost energy expenditure to the same degree. This illustrates that large doses of green tea are not needed to achieve this benefit.

The combination of 500mg of green tea and exercise improved body weight, BMI, waist to hip ratio, and body fat percentage more than exercise alone.

While the weight loss and energy benefits of green tea seem clear, Force factor doesn’t share details for how much of this supplements is inside ProbioSlim


One of the most commonly used substances worldwide, the inclusion of caffeine in ProbioSlim may help boost energy, combat fatigue, and support weight loss.

These effects are well-studied.

Caffeine at 3 mg/kg body weight doses given before physical activity resulted in more fat burning in healthy subjects. Doses at 3-6mg/kg body enhanced performance during endurance exercise.

A recent review of 13 studies found that caffeine can promote weight, BMI, and body fat reductions. Lastly, you may also be able to better maintain weight loss success by consuming caffeine.

Caffeine has a proven ability to boost energy and support weight loss; ProbioSlim offers 2 forms of caffeine but does not detail the quantity of either.

Prebiotic Fruit Extract

Kiwi, fig, and papaya extracts are included in ProbioSlim to act as a source of food to fuel LactoSpore.

Prebiotics are non-digestible substances or fiber that can improve health by stimulating the activity of probiotics.

But they may offer more than just support for probiotics.

Prebiotics may play a role in increasing the digestions and absorption of nutrients, decreasing harmful bacteria, reducing allergies, and improving immune function.

Safety and Side Effects

Serious side effects are extremely rare in probiotic supplements. You are most likely to experience mild side effects like abdominal pain, gas, bloating, and diarrhea.

These symptoms are relieved by lowering your dose or discontinuing use.

ProbioSlim is also a stimulant-containing supplement. As it offers 2 forms of caffeine, the risk for unwanted effects may be greater.

The FDA warns against rapidly consuming 1,200mg of caffeine, as this can cause seizures. Additionally, 400mg daily is understood to be the safest use of caffeine.

As Force Factor does not share the total caffeine content, consuming this supplement, along with your normal coffee, soda, and tea regimen, may put you in an unsafe range.

Consuming excess caffeine may result in restlessness, nausea, agitation, rapid heart rate, and elevated blood pressure.

For these reasons, be cautious with ProbioSlim and similar products. Always ask your physician about safety concerns before using probiotics. Consume probiotics only in the ways that are recommended.

What Does ProbioSlim Cost?

You can pick up your ProbioSlim online at Walmart and Amazon - their 60ct (1-month supply) is available for $53.56 or $35.76, respectively.

Naturally, this means that Amazon is the more cost-effective choice. Also, as Probioslim is prime eligible, you can take advantage of the free shipping and returns.

According to their site, your purchases are backed by a 30-day guarantee.

To process your return, simply call 1-800-429-0415 for an RMA number. The RMA number should be attached to the outside of your package and returned to:

Force Factor, 105 Commerce Dr, Aston, PA 19014


A quick internet search will reveal the vast number of combined pre and probiotic supplements similar to ProbioSlim that are currently available.

Complete Prebiotic & Probiotic from Olympian Labs is a great example. A 1-month supply is currently $21.99 at the Vitamin Shoppe.

This blend provides 25 billion CFU in each capsule and is more cost-effective than ProbioSlim.

You may also save money by purchasing your pre and probiotic supplements separately.

Lastly, you can obtain pre and probiotics naturally from consuming a diet rich in fruits, vegetables, and fermented foods like yogurt, sauerkraut, kimchi, and kombucha. However, it would be challenging to be certain of which strains and how much you are getting.

The Bottom Line

While ProbioSlim contains ingredients that are backed by research, the company does not share details of the quantity of each.

This makes it impossible to determine if the amount of each ingredient is too little to be effective or how likely you are to experience side effects.

While the unwanted effects of pre and probiotics are mild, those related to excess caffeine can be dangerous. This seems to be reflected in the 3.7 rating at Amazon on over 700 reviews.

Those least happy cite a number of side effects that include hand tremors and digestive issues.

Pricing is another concern. You can save by purchasing at Amazon, but it is still a fairly pricey supplement.

If you’re experiencing symptoms you feel may be relieved by a dietary supplement, your first step should be discussing with your doctor.

Customer Reviews

Start your review of ProbioSlim:
  • 57 Customer Reviews
  • 29% Recommend This Company
2.0 out of 5
5 star: 12% 4 star: 8% 3 star: 5% 2 star: 10% 1 star: 63%

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  • Ordered Trial, Then saw these Reviews.

    I ordered the trial of ProbioSlim and saw my account debited right away for $2.99. But what also made me suspicious was beside the charge on my bank statement, it also said "waiting for final amount from merchant". Why would it need to do that if it was indeed only $2.99?

    Then I stumbled upon this page where I started reading all of your reviews. How I was going to keep getting ProbioSlim and be charged for it after the trial period, without my knowledge or consent. How sneaky. So I called the phone number provided and asked to cancel. The gentleman asked me why I wanted to cancel. I was honest and told him that I was reading on a website that the Company keeps charging after the trial period and sending product, without the customer consent or knowledge, and I didn't want this to happen to me. He then said, ok, you've been canceled. Ha, no arguments what so ever.

    I asked for a refund of my $2.99, but he told me my trial of the product had already been sent out to me, so that was not an option. I can live with knowing I made a $2.99 mistake. I want to thank you all for potentially saving me hundreds of dollars.

    I never read anywhere on the ProbioSlim website that I was joining a membership, and the product would continue to be sent to me and billed to my account. They should be put out of business for cheating people, and being deceptive.

    Thank you again everyone, for saving me.

  • Hidden Costs are a SCAM

    Beware of this "free trial" and the details of their autoship program.

    They offer a 14-day trial. But the 14 days starts the day you place the order, NOT the day the product arrives. By the time my product arrived, I had about 4 days to evaluate and decide whether to keep or cancel? That's ridiculous.

    But it gets better. They then charged me $79 and shipped out more product. I called and canceled, and returned the second shipment of product. But the $79 was never refunded.

    Turns out, that as part of their "14-day trial offer," they send you 30 days worth of product. So if you don't return THAT (the trial product), they charge you for that!

    Strangely, if you say you want to cancel your membership, they are suddenly able to cut 75% off the cost of the product! Which just makes their customers feel like suckers for having paid the higher price.

    In short, this company is terrible. They are sneaky, manipulative and dishonest. I hope they get sued and taken for everything.

    I didn't get a chance to formulate an opinion on the actual product. That's how bad the company was.

    Bottom Line: No, I would not recommend this to a friend

  • Don't go there

    • By Jan,
    • Australia,
    • Oct 17, 2016
    • Verified Reviewer

    I ordered the free trial and have not received the trial, however, my credit card has been charged $108.33 and I have no product.

    I have tried to ring the number and it has a recording stating to phone back in office hours. This is the number for Australia.

    I have tried various times of the day to phone this company without success, they have no email address.

    I have reported the transaction to my bank as fraud.

    Bottom Line: No, I would not recommend this to a friend

  • I feel ripped off by this Company

    • By Dee Shaw,
    • Perth, Western Australia,
    • Oct 1, 2016
    • Verified Reviewer

    This product didn't work for me and I have been unable to contact them to cancel. The result is that they are deducting over $100AUD from my account on a monthly basis and I don't know what to do other than report it as a scam and close my bank account.

    The contact number they provide for Australia has a recording saying phone back during office hours, that's despite whatever time you phone, day or night.

    I suggest you avoid this con and then you won't get ripped off like I did.

    Bottom Line: No, I would not recommend this to a friend

  • It's not right

    • By Rebecca,
    • Lebanon, TN,
    • May 5, 2016
    • Verified Reviewer

    I saw the advertisement online and wanted to try it. I got it but it's not working. I'm not losing weight and I'm still gassy. I was charged a fee out of my account that I never authorized so I went back and looked at the ad and never saw that you can cancel anytime. I've called them, plus my bank. I'm calling my bank again in the morning and going to dispute the charges. I will also call the number again that I've found on the leaflet that came with the product and talk with them as well tomorrow. Do not buy this product.

    Bottom Line: No, I would not recommend this to a friend

  • Rip Off

    I was taken in by the advertising and ordered a sample where I only paid shipping. Two weeks later I have a charge on by bank account for $74.98 for something I did not approve or order.

    I called their number and requested to have the charge removed. "Customer Service" offered to immediately refund 60% and let me keep the product. I said that I did not want the product. I was then told to repackage it upon receipt and take it to the post office to re-ship. Once they receive the product then and only then would they refund the charge.

    Your product must be pretty weak if you have to run a scam to sell it.

    Bottom Line: No, I would not recommend this to a friend

  • Need Answers

    Asked for the 14 day trial bottle and paid shipping charges. However, I received two charges on 02/06/2016 and 02/08/2016 for $74.98 without my consent. And on top of it, I don't want the product. Credit card now has a balance of $150.00 Have NO WAY to contact the company. What does this tell you? May not be a legit business. No contact information on the bottle as well.

    Bottom Line: No, I would not recommend this to a friend

  • Do Not Buy

    • By Judy ,
    • Missouri,
    • Jun 22, 2015
    • Verified Reviewer

    The product was not agreeing with me and I called to cancel and they would not cancel it for me. They said they would put my account on hold and they couldn't charge my account until it was off hold and they would call first before they charged my bank. Well, guess what? They took money out of my bank today without calling. I have a bill due in two days that is an automatic withdrawal and the money is not there now.

    I called Probioslim to report what happened and spoke with Tyler. He told me that the first person I talked with should not have told me they would call because they don't. Then Tyler said I could have a refund but it would only be 60% of what I was charged. I told him I wanted to talk to a manager and he put me on hold. I believe he came back on the line telling me his name was Chris. I told him he sounded a lot like Tyler and the phone went silent. I held on and finally he said that he had taken care of me and I would get a full refund in two to three days. My bill is due in two days. I told him it had better be in the bank tomorrow or they were getting a bill for the service charge. He continued to try to make a fool out of me that I would have my money back in three days at the latest. I told him that would be too late and it had better be in there tomorrow and he said it will be returned. I told him if it wasn't that I would be calling back.

    Missouri's Attorney General will be hearing about this and very soon. Do not trust Probioslim. Buy it at GNC if you really want it.

    Bottom Line: No, I would not recommend this to a friend

  • I feel better.

    • By Laura,
    • Pueblo, CO,
    • Apr 7, 2016
    • Verified Reviewer

    I ordered this as a one time deal through Walmart and really love the results during the last two weeks. I feel better and lost seven pounds. I plan to continue to use because I'm tired of haing digestion issues and it has helped me tremendously. Thank you ProbioSlim.

    Bottom Line: Yes, I would recommend this to a friend

  • Buyer beware

    • By Nancy,
    • Oct 4, 2015
    • Verified Reviewer

    I ordered free sample plus ordered a 30-day bottle at the same time. It gives me such a bad tummy ache that I can't take it. I got the double whammy when they took 74.98 from my checking account. When I called them they say it's supposed to cause me stomach pain? Why would I want to put myself through more pain? Am I glutton for punishment? They did refund me 41.99 but refuse to refund the rest. Now the only pain I have is knowing that I ordered this product in the first place.

    Bottom Line: No, I would not recommend this to a friend

  • Use a visa gift card for online purchases

    • By Brandie,
    • Cleveland, TX,
    • Mar 14, 2015
    • Verified Reviewer

    I ordered the trial but didn't start taking the product until I read some reviews. After reading all of this on here, I will not start taking this product ever. I would like to add that you should get a visa gift card to order things like this instead of putting it on your credit card. This way if you don't like the product, they wont be able to bill you for anything else. They are one time use cards so once you spend all the money on the card, they wont be able to bill you for anything else later. This is the only way my family makes online purchases. This also helps with people somehow getting your credit card info since it's just a gift card. So once you spend all the money on the card, it won't matter who gets the card number.

    Bottom Line: No, I would not recommend this to a friend

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