Men’s High Performance Probiotic Formula

In Stock | $9.95 FREE shipping on all orders

Biotics 8 contains pre and probiotics to help improve gut microbiome, so you can perform at your peak, feel lighter, leaner, and have loads more energy!

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  • Supports healthy testosterone levels

  • Fortify immune system

  • Bulletproofs digestion

  • Strengthens gut-brain axis

Jeff R

“My bloating has gone down and I have more energy. Best probiotic I’ve taken. Zero stomach pain. Digestion feels awesome.”

Jeff R

Scottsdale, AZ

The Benefits Of A Thriving Microbiome

And what you can expect while taking Biotics 8 on a daily basis*

  • <p>Bulletproof Digestion</p>

    Bulletproof Digestion

    Imagine eating at a restaurant with confidence again! Our formula includes digestive enzymes to help break down fat, proteins, and sugars without digestion discomfort, gas, or other IBS issues.

  • <p>Improve Focus</p>

    Improve Focus

    Want to get more accomplished in a day? Our formula helps to strengthen the gut-brain axis, which may help improve cognitive functions like mental endurance and focus.[1,2]

  • <p>Support Mental Wellbeing</p>

    Support Mental Wellbeing

    Our probiotics + vitamin D3 formula can help restore gut microbiome, improve serotonin levels, help relieve stress, and boost immune health.[3]

  • <p>Boost Testosterone Levels</p>

    Boost Testosterone Levels

    Study conducted in Italy revealed men who consume bacteria-rich probiotics may experience higher testosterone levels, along with higher sperm concentration, volume, and motility.[4]

  • <p>Aid With Weight Loss</p>

    Aid With Weight Loss

    Probiotics + added prebiotic fiber from chicory root can naturally help curb appetite, help break down food more effectively, and even help shed excess fat through bowel movements.[5,6,7]

  • <p>Increase Muscle Growth</p>

    Increase Muscle Growth

    In a study done on mice shows promising results for humans - probiotics, specifically the Lactobacillus plantarum strain, were shown to help increase muscle growth, energy, and endurance.[8]

  • <p>Fortify Immune System</p>

    Fortify Immune System

    When your gut microbiome is in tip-top shape, research shows it can help strengthen the immune system to help fight off illnesses with ease.[9,10]

Try us risk free for 2 full months

...and see a positive difference in your gut health or we’ll refund your entire investment. No questions asked.

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  • Digestion Is Better

    testimonial rating

    Good strong probiotic. My digestion is better. Best formula I’ve tried.

    Jonathon W. NYC, NY
  • More Energy

    testimonial rating

    Fixed my gut and I feel like I have way more energy than before. I feel more awake in the morning. Great probiotic.

    Alex E. Ann-Arbor, MI
  • Made Me Feel Stronger

    testimonial rating

    Feel stronger while taking this. I’m on my second bottle and so far I’m happy with how I feel. I have more energy and I feel like I can push further while lifting.

    Trevor L. Albuquerque, NM
  • Gas Has Disappeared

    testimonial rating

    I’ve taken probiotics in the past and they hurt my stomach. I kept getting told I need to take prebiotics as well. I gave this a try and I’m really pleased with the results! I don’t feel like garbage after I eat.

    Jonathan P. Boston, MA
  • Rock Solid Digestion

    testimonial rating

    I normally get ‘bubble guts’ after I eat dairy...I started Biotics 8 because of the added digestive enzymes. Since starting it, I can now enjoy cheese and cream without as much pain. Digestion feels stellar on ths! Five stars!!

    Nathan L. Orlando, FL
  • My Poops Are The Best Ever

    testimonial rating

    I hate sauerkraut or kefir or far this probiotics is doing the trick!! I feel like my digestion is back to normal. My poops are the best ever hahaha.

    Daryl W. San Jose, CA

Not All Probiotic Formulas Are Made Equally

Did you know there are over 500 types of probiotics[11]?

And out of those 500 probiotics, how do you know which combination of strains is right for your gut...?

Here’s the truth - many probiotic supplement companies will oftentimes put together a ‘mixed bag’ of weak, low-grade probiotics that rarely provide enough gut support.

That’s why we set out to create a one-of-a-kind high-performance probiotic formula that addresses men’s gut health, so guys like you can begin to experience...

  • Restored gut microbiome

  • More energy that lasts the entire day

  • Easier bowel movements

  • Stronger immune system

  • Healthier, happier mood

  • Rock-solid digestion

  • More focused attention

  • And so much more like improved sleep, stronger bones and clearer skin!

Try Biotics 8 today risk-free and experience the cascade of health benefits that come from having a thriving gut microbiome!

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The First Performance Probiotics

For Men’s Gut Health

We crafted our Biotics 8 men’s probiotic formula with your performance needs in mind!

You’re a high-achiever - someone that pushes himself...outworks everyone else...and doesn’t settle for anything less than your absolute best.

And truth is, no probiotic formula out there could keep up with your gut needs...until now!

For Biotics 8, we hand-picked each live bacterial strain that has been backed by scientific studies for its effectiveness in re-colonizing and restoring your gut microbiome to it’s peak state.

Our men’s premium probiotic formula includes:

  • 10 live + potent strains of good gut bacteria that deliver 20 billion CFUs safely and without stomach issues

  • Added Vitamin D + digestive enzymes for added mood support and a rock-solid gut

  • Vegetarian friendly HPMC capsules, which are stronger than gelatin capsules, and are made to survive the trek all the way to the small intestines![12]

  • Prebiotic fiber from chicory root to help nourish probiotic bacteria after its long journey down to your small intestine

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Take Biotics 8 To Achieve Optimal Gut Support

Made For Men Of All Ages

Biotics 8 helps restore gut microbiome so you can experience all of the health benefits of a well-balanced gut

  • High Achievers

    Probiotics help support the gut-brain axis which may help boost focus and drive

  • Men Over 40

    As we age, our gut health can take a toll, which may cause all sorts of metabolic and immune issues. Our probiotics help combat these issues and improve metabolism functions

  • Overworked

    Stress can wreak havoc on our gut, which may trigger an avalanche of other health problems. Our probiotic formula can help rebalance gut bacteria and improve stress levels

  • Students

    There’s a lot on your plate, and the last thing you want is brain fog. Our formula can help kick brain fog and improve mental focus

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How Do We Stack Against Our Competitors?

Live active strains
Chicory Root prebiotic fiber
No refrigeration needed
Addresses men’s gut health
Added Vitamin D for extra mood support
Added enzymes for better digestive system
100% satisfaction, 60-day money back guarantee!

20 billion


Low as $1.30 a day!

200 billion


45 billion


16 billion


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What’s Inside Biotics 8?

Premium, all-natural ingredients, backed by science.

Saccharomyces Boulardii

Helps to reduce inflammation in the colon and prevent diarrhea. A study done on rats also suggest this bacterial strain may improve endurance.[13]

Lactobacillus casei

Helps improve bowel movements. Studies also suggest L. casei may help dial down stress by improving serotonin levels.[14,15]

Lactobacillus rhamnosus

Study shows L. rhamnosus may help prevent leaky gut and eliminate IBS symptoms by “sealing” gut lining.[16]

Lactobacillus plantarum

Helps to prevent IBS issues and stomach cramps.[17] One study also reveals L. plantarum may increase sperm count, volume, and motility.[18]

Lactobacillus acidophilus

Helps to fortify digestion, fight leaky gut, and improve weight loss efforts.[19,20]

Lactobacillus paracasei

Helps with IBS symptoms, including gas, bloating, constipation, and diarrhea.[21] Plus, research also shows L. paracasei may also help stop fat accumulation.[22]

Lactobacillus fermentum

Strengthens immunity, helps calm inflammation, and may even help reduce feelings of anxiety.[23,24,25]

Bifidobacterium longum

Helps to strengthen immunity, combat illness, and prevent gastrointestinal problems.[26]

Bifidobacterium breve

One study discovered B. breve can help increase muscle mass and reduce overall body fat after 12 weeks.[27]

Bifidobacterium bifidum

IBS be-gone! B. bifidum has been studied and shown to help reduce IBS symptoms, bloating, and excess gas.[28]

Digestive Enzymes

Lipase, amylase, and protease were added to the formula to help break down carbs, fat, and protein so you can digest without discomfort.

Chicory root fiber

Prebiotics derived from natural chicory root helps feed the probiotics, which helps strengthen a diverse gut microbiome.

Vitamin D

Helps to improve mood, immune system, bone density, and natural testosterone.[29,30,31,32]

  • Probiotics
    + Prebiotics
  • Crafted For
    High Performance
  • 20
    Billion CFUs
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Finally, A High-Performance Gut Formula For Men

Just take 3 easy-to-swallow capsules of Biotics 8 every day to help nourish your body with good gut bacteria and experience optimal gut health!


Zero preservatives


No refrigeration needed




Made in the USA

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A Rock Solid Gut Starts With Your First Dose*

Here’s what you could expect as you continue to take Biotics 8 on a daily basis*

Within The First 24 To 48 Hours

Take 3 capsules first thing in the morning. During this period, your gut microbiome becomes acquainted with the newly introduced probiotic bacteria.

In Two Weeks

You may begin to notice the positive benefits of a diverse microbiome, including better digestion, reduced IBS symptoms, improved mood, and even more energy.

In 1 Month

You may begin to notice even bigger improvements with your overall health inlcluding some possible weight loss, clearer thinking, and more testosterone that makes you feel like a man.

In 3 Months And Beyond

Your gut feels rock-solid. You eat with confidence again, without gas or indigestion, Your energy is through the roof, and without caffeine. Your sleep has improved; your skin looks better, and you continue to drop pounds and put on muscle!

You can experience all of this and more...

when you optimize your gut health with Biotics 8 today!

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What To Expect With Biotics 8?

Biotics 8 delivers 10 probiotic strains with 20 billion CFUs, plus digestive enzymes and vitamin D to help restore gut microbiome for pinnacle health!

  • Life Without Biotics 8

    • Weakened Immune System
    • Imbalanced Gut Flora
    • Embarrassing IBS Symptoms
    • Excess Weight Gain
    • Draining Brain Fog
    • Zero Energy & Motivation
  • Life With Biotics 8

    • Strengthended Immune System
    • Optimized Gut Flora
    • Zero Bloating, Gas, Or IBS Issues
    • Shed Excess Pounds Fast
    • Sharper Thinking
    • Skyrocket Energy & Drive
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Nourish Your Gut And Thrive

For As Low As $1.30 A Day!

  • green tick

    Restores gut microbiome

  • green tick

    Helps eliminate IBS symptoms

  • green tick

    Supports digestion health

  • green tick

    Boosts mood

  • green tick

    Strengthens immune system

  • green tick

    Increases energy

  • green tick

    Raises testosterone

  • green tick

    Improves bowel movements

  • green tick

    10 exact strains with 20 billion CFUs

  • green tick

    Try us 100% risk-free!

Secure Your Biotics 8 Package & Save Today!

*Due To Limited Stock - Only 5 Per Household*

Free shipping on all orders

100% satisfaction, 60-day money back guarantee

Bigger savings on higher packages

Clinically-backed bacterial strains

1 Month Supply

Retail: $79.99
Today: $64.99
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2 Months + 1 Month Free

Retail: $239.97
Today: $129.99
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3 Months + 2 Months free

Retail: $399.95
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Try It Risk Free...
It Works Or You Don’t Pay!

Remember, there’s zero risk to you when you order any of the Biotics 8 packages today.

If you don’t experience positive gut health benefits as promised on this page, including less IBS symptoms, improved digestion, lifted mood, better bowel movements, and more energy and focus, then we’ll return your money, every penny, with zero hassle.

We know the likelihood of this happening is very low, and this is why we can make such a strong guarantee.

However, if you’re not happy, then we’re not happy and we’ll do whatever it takes to make it right.

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Frequently Asked Questions

Which Biotics 8 package is right for me?

Many of our customers who experience the best results— including well-balanced gut bacteria, enhanced digestion, less bloating, stronger immune system, more energy, and even improved weight loss— often secure the 3 and 5-bottle packages of Biotics 8.

Remember, to achieve the best gut health possible, it takes some time to restore our gut microbiome. Plus, everyone’s gut is different based on location, diet, genetics, access to proper nutrition, and daily exercise.

While a single bottle of Biotics 8 can give you many of the benefits, we recommend taking Biotics 8 on a regular basis for up to 3 months or longer to experience everything our premium formula has to offer.

There’s no added risk to you by ordering more today. You are still covered by our 100%, 60-day money-back guarantee, which you won’t find anywhere else.

Additionally, when you order today while on this page, you can guarantee you’ll receive your order before we run out of stock!

How soon will I notice positive results?

Many of our customers have noticed positive gut health results in as little as 2 weeks—some even see a difference in their digestion and bowel movements in 7 days! However, this does not take into account diet, exercise, and proper nutrition.

But what we can say is that with consistent use of Biotics 8, you can begin to feel and see a noticeable change in your digestion, mood, and overall health within 60 days of purchase or we’ll return your money without hassle.

What makes Biotics 8 better than other probiotic formulas?

Not all probiotics formulas are created equally. Other probiotic formulas do not consider all of the strains of bacteria they are putting into their formula— they go by high numbers of strains, when this could be a waste of money, or even cause worse gut issues. 

Our Biotics 8 formula is crafted specifically to support men’s gut health. 

Our formula is gluten-free, soy-free, shelf-stable, and contains a healthy dose of prebiotics, digestive enzymes, and vitamin D.

Will this formula give me gas?

No. Biotics 8 does not give you gas, nor does it cause any other form of stomach discomfort. Biotics 8 contains added digestive enzymes to help improve digestion without uncomfortable or embarrassing mishaps.

Does Biotics 8 need to be refrigerated?

No. Biotics 8 is completely shelf-stable and does not require refrigeration. This makes it convenient for you to toss the bottle in your gym bag, backpack, or carry-on luggage.

Does this contain live strains of probiotics?

Yes! We focused on providing each capsule with 10 premium and science-backed strains of probiotics.

How can I tell if the bacteria strains are alive or not?

Try us for yourself and see! But if you want to really be sure, here’s what you can do:

Break open one capsule of Biotics 8 and pour it into a bowl. Add about 1⁄4 cup of whole milk to the bowl, give it a stir, and wait 24 hours. If the milk has curdled, then you know you have a premium probiotic formula with live, active strains of good gut bacteria!

Is Biotics 8 safe?

Yes! Biotics 8 is completely safe. Our formula is made using only science-backed, live strains of probiotics that are natural, gluten-free, and are entirely safe, with no known side effects. 

Additionally, our probiotic formula is made in the USA in a GMP-certified facility. Our formula must also pass a series of tests to ensure each bottle that leaves the facility contains live strains of probiotics, or we throw it out. 

So you can be safe knowing every dose you take is packed with real, live cultures with 20 billion CFUs ready to go to work on your gut.

We recommend consulting with your professional health physician before starting any health regimen.

Does this help with IBS or SIBO?

Yes! Our Biotics 8 formula is crafted to combat IBS and SIBO where it begins— the gut. Our 10 strains have numerous studies showing how well they work to fix a broken, imbalanced gut, including symptoms associated with IBS and SIBO.

How do I take Biotics 8?

For best results, we recommend taking just 3 easy-to-swallow capsules of Biotics 8 with a glass of water first thing in the morning. 

Then repeat the process every day for the next several months to ensure your gut is receiving all of the good gut bacteria needed to thrive.

What if I’m not satisfied with my results while taking Biotics 8?

We always recommend securing the 3 or 5-bottle package of Biotics 8 so you can give it a fair chance at providing the positive gut benefits promised on this page.

With that said, if you are unhappy with your results by taking Biotics 8 on a regular basis, then you may return your order within 60 days of purchase for a full refund.

We promise that by taking Biotics 8 daily as part of your morning routine, you will begin to experience positive gut results within a few short weeks’ time!

Is my credit card information safe?

Yes! We process all of our orders through a safe, encryption payment processing system. We do not have access to your credit card information, nor do we have the ability to store your credit card information.

After I place my order, how soon will I receive my package?

If you live in the United States or the United Kingdom, your order should arrive within 5 business days.

Where can I buy Biotics 8?

You can buy Biotics 8 directly on this page. Our checkout process is fast, simple, and secure.

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†The statements on this site have not been evaluated by the Food and Drug Administration. Our products are not intended to diagnose, treat, cure or prevent any disease. Always consult with a qualified healthcare professional prior to beginning any diet or exercise program or taking any dietary supplement. The content on our website is for informational and educational purposes only and is not intended as medical advice or to replace a relationship with a qualified healthcare professional.

Trusted Scientific Sources:

1“Probiotics May Help Boost Mood and Cognitive Function.” Harvard Health, 8 June 2019, function#:~:text=Probiotics%20can%20do%20more%20than,called%20the%20gut%2Dbrain%20axis.

2Marotta, Angela, et al. “Effects of Probiotics on Cognitive Reactivity, Mood, and Sleep Quality.” Frontiers in Psychiatry, Frontiers Media S.A., 27 Mar. 2019,

3Zhang, Ning, et al. “Probiotic Supplements for Relieving Stress in Healthy Participants: A Protocol for Systematic Review and Meta-Analysis of Randomized Controlled Trials.” Medicine, Wolters Kluwer Health, May 2019,

4G;, Maretti C;Cavallini. “The Association of a Probiotic with a Prebiotic (Flortec, Bracco) to Improve the Quality/Quantity of Spermatozoa in Infertile Patients with Idiopathic Oligoasthenoteratospermia: A Pilot Study.” Andrology, U.S. National Library of Medicine,

5Ogawa A;Kobayashi T;Sakai F;Kadooka Y;Kawasaki Y; “Lactobacillus Gasseri SBT2055 Suppresses Fatty Acid Release through Enlargement of Fat Emulsion Size in Vitro and Promotes Fecal Fat Excretion in Healthy Japanese Subjects.” Lipids in Health and Disease, U.S. National Library of Medicine,

6Yadav H;Lee JH;Lloyd J;Walter P;Rane SG; “Beneficial Metabolic Effects of a Probiotic via Butyrate-Induced GLP-1 Hormone Secretion.” The Journal of Biological Chemistry, U.S. National Library of Medicine,

7B;, Wiciński M;Gębalski J;Gołębiewski J;Malinowski. “Probiotics for the Treatment of Overweight and Obesity in Humans-a Review of Clinical Trials.” Microorganisms, U.S. National Library of Medicine,

8Daniells, Stephen. “‘Truly Exciting’: Probiotic May Increase Muscle Mass, Energy & Performance.” Nutraingredients, William Reed Ltd, 12 Apr. 2016,

9KE;, Resta-Lenert S;Barrett. “Live Probiotics Protect Intestinal Epithelial Cells from the Effects of Infection with Enteroinvasive Escherichia Coli (EIEC).” Gut, U.S. National Library of Medicine,

10DB;, Yan F;Polk. “Probiotics and Immune Health.” Current Opinion in Gastroenterology, U.S. National Library of Medicine,

11Ciorba, Matthew A. “A Gastroenterologist's Guide to Probiotics.” Clinical Gastroenterology and Hepatology : the Official Clinical Practice Journal of the American Gastroenterological Association, U.S. National Library of Medicine, Sept. 2012,

12“HPMC Capsules: Gaining Momentum in the Nutraceutical Industry (Part I).” Nutraceutical Business Review

13Soares ADN;Wanner SP;Morais ESS;Hudson ASR;Martins FS;Cardoso VN; “Supplementation with Saccharomyces Boulardii Increases the Maximal Oxygen Consumption and Maximal Aerobic Speed Attained by Rats Subjected to an Incremental-Speed Exercise.” Nutrients, U.S. National Library of Medicine,

13Soares ADN;Wanner SP;Morais ESS;Hudson ASR;Martins FS;Cardoso VN; “Supplementation with Saccharomyces Boulardii Increases the Maximal Oxygen Consumption and Maximal Aerobic Speed Attained by Rats Subjected to an Incremental-Speed Exercise.” Nutrients, U.S. National Library of Medicine,

14Kato-Kataoka A;Nishida K;Takada M;Suda K;Kawai M;Shimizu K;Kushiro A;Hoshi R;Watanabe O;Igarashi T;Miyazaki K;Kuwano Y;Rokutan K; “Fermented Milk Containing Lactobacillus Casei Strain Shirota Prevents the Onset of Physical Symptoms in Medical Students under Academic Examination Stress.” Beneficial Microbes, U.S. National Library of Medicine,

15Takada M;Nishida K;Kataoka-Kato A;Gondo Y;Ishikawa H;Suda K;Kawai M;Hoshi R;Watanabe O;Igarashi T;Kuwano Y;Miyazaki K;Rokutan K; “Probiotic Lactobacillus Casei Strain Shirota Relieves Stress-Associated Symptoms by Modulating the Gut-Brain Interaction in Human and Animal Models.” Neurogastroenterology and Motility : the Official Journal of the European Gastrointestinal Motility Society, U.S. National Library of Medicine,

16Han X;Lee A;Huang S;Gao J;Spence JR;Owyang C; “Lactobacillus Rhamnosus GG Prevents Epithelial Barrier Dysfunction Induced by Interferon-Gamma and Fecal Supernatants from Irritable Bowel Syndrome Patients in Human Intestinal Enteroids and Colonoids.” Gut Microbes, U.S. National Library of Medicine,

17Kaźmierczak-Siedlecka, Karolina, et al. “The Role of Lactobacillus Plantarum 299V in Supporting Treatment of Selected Diseases.” Central-European Journal of Immunology, Termedia Publishing House, 2020

18Rahimiyan-Heravan, Marziyeh, et al. “The Potential Therapeutic Effects of Lactobacillus Plantarum and Inulin on Serum and Testicular Reproductive Markers in Diabetic Male Rats.” Diabetology & Metabolic Syndrome, BioMed Central, 26 June 2020,

19Álvarez-Arraño, Valentina, and Sandra Martín-Peláez. “Effects of Probiotics and Synbiotics on Weight Loss in Subjects with Overweight or Obesity: A Systematic Review.” Nutrients, MDPI, 17 Oct. 2021,

20María Remes Troche, José, et al. “Lactobacillus Acidophilus Lb: A Useful Pharmabiotic for the Treatment of Digestive Disorders.” Therapeutic Advances in Gastroenterology, SAGE Publications, 24 Nov. 2020,

21Lewis, Erin D, et al. “Efficacy of Lactobacillus Paracasei Ha-196 and Bifidobacterium Longum R0175 in Alleviating Symptoms of Irritable Bowel Syndrome (IBS): A Randomized, Placebo-Controlled Study.” Nutrients, MDPI, 21 Apr. 2020,

22TM;, Chiang SS;Pan. “Beneficial Effects of Lactobacillus Paracasei Subsp. Paracasei NTU 101 and Its Fermented Products.” Applied Microbiology and Biotechnology, U.S. National Library of Medicine

23West, Nicholas P, et al. “Lactobacillus Fermentum (PCC®) Supplementation and Gastrointestinal and Respiratory-Tract Illness Symptoms: A Randomised Control Trial in Athletes.” Nutrition Journal, BioMed Central, 11 Apr. 2011,

24Frick JS;Schenk K;Quitadamo M;Kahl F;Köberle M;Bohn E;Aepfelbacher M;Autenrieth IB; “Lactobacillus Fermentum Attenuates the Proinflammatory Effect of Yersinia Enterocolitica on Human Epithelial Cells.” Inflammatory Bowel Diseases, U.S. National Library of Medicine,

25Wang T;Hu X;Liang S;Li W;Wu X;Wang L;Jin F; “Lactobacillus Fermentum NS9 Restores the Antibiotic Induced Physiological and Psychological Abnormalities in Rats.” Beneficial Microbes, U.S. National Library of Medicine,

26Wong, Chyn Boon, et al. “Beneficial Effects of Bifidobacterium Longum Subsp. Longum BB536 on Human Health: Modulation of Gut Microbiome as the Principal Action.” Journal of Functional Foods, Elsevier, 8 Feb. 2019,

27Minami, Junichi, et al. “Effects of Bifidobacterium Breve B-3 on Body Fat Reductions in Pre-Obese Adults: A Randomized, Double-Blind, Placebo-Controlled Trial.” Bioscience of Microbiota, Food and Health, BMFH Press, 2018,

28K;, Guglielmetti S;Mora D;Gschwender M;Popp. “Randomised Clinical Trial: Bifidobacterium Bifidum MIMBB75 Significantly Alleviates Irritable Bowel Syndrome and Improves Quality of Life--a Double-Blind, Placebo-Controlled Study.” Alimentary Pharmacology & Therapeutics, U.S. National Library of Medicine,

29Aranow, Cynthia. “Vitamin D and the Immune System.” Journal of Investigative Medicine : the Official Publication of the American Federation for Clinical Research, U.S. National Library of Medicine, Aug. 2011,

30Penckofer, Sue, et al. “Vitamin D and Depression: Where Is All the Sunshine?” Issues in Mental Health Nursing, U.S. National Library of Medicine, June 2010,

31NM;, Lips P;van Schoor. “The Effect of Vitamin D on Bone and Osteoporosis.” Best Practice & Research. Clinical Endocrinology & Metabolism, U.S. National Library of Medicine

32Pilz S;Frisch S;Koertke H;Kuhn J;Dreier J;Obermayer-Pietsch B;Wehr E;Zittermann A; “Effect of Vitamin D Supplementation on Testosterone Levels in Men.” Hormone and Metabolic Research = Hormon- Und Stoffwechselforschung = Hormones Et Metabolisme, U.S. National Library of Medicine,