TL;DR — Why Probiotics Don’t Work Long Term

  • Probiotics rarely colonize the gut permanently. They help temporarily, but most do not survive long-term.

  • Your gut environment matters more than the probiotic itself. A hostile digestive tract won’t support beneficial bacteria.

  • Inflammation, excess sugar, processed foods, and poor digestion damage the GI lining and disrupt the microbiome.

  • A short-term reset — about 30 days — can dramatically improve gut health by reducing inflammation and feeding beneficial bacteria.

  • A produce-heavy diet (about 75% by volume) supports microbial diversity and resilience.

  • For sensitive digestion, strategies like juicing, bone broth, gentle fibers (such as citrus pectin), and digestive enzymes may help prepare the gut for probiotics.

  • Once the gut environment improves, probiotics are more likely to be effective.

3 Easy Steps to Gut Health

Ads for probiotics are everywhere. They help you digest better, get rid of bloat, improve irregularity and even boost the immune system.  They have effectively been used to treat antibiotic associated diarrhea. The researchers agree with this, studies even show probiotics to be beneficial to people with asthma or allergies. The thing is, why do you need to keep taking them? Probiotics are not a complete solution for balancing the microbiome.

Probiotics can help temporarily, but the overall gut ecosystem matters far more. For a broader explanation of how gut bacteria influence digestion, immunity, and inflammation, see our overview of gut microbiome health.

Why you need to keep taking them: Probiotics are living organisms. If you need to keep taking them, they are not surviving in your digestive system. It is like delivering a boatload of tigers to Antarctica—they may kill a few penguins, but eventually they will freeze to death. The environment is hostile to them.

The colon is an ecosystem. When you take probiotics, you influence it a little bit, and usually for a short time. If you want to continue to enjoy the benefits of probiotics, make your digestive tract a good home for them.

Is this difficult?  Yes, but it is not forever. Try it for 30 days; you can do anything for 30 days. Depending on how “sick” you are, you may need to do it longer. Thirty days will give you a sense of how beneficial this is. Once your digestive tract is healthy, you can tolerate some surprisingly unhealthy foods. Just don’t eat them often, or your digestive tract will go back into disrepair. Instead of thinking about “good foods” vs “bad foods” on a daily basis, we are going to aggressively use diet to help you heal.

Step 1: STOP Eating Inflammatory Foods

Inflammation will damage the GI lining, which is the barrier that protects the rest of your body from what is contained in the GI tract. Also, the lining of the small intestine makes enzymes, which helps digest food and keep it from feeding “undesirable” bacteria. An inflamed GI tract will make it difficult for your probiotics to survive. Completely avoid (for at least 30 days):

  • Refined sugar: This, of course, includes candy, cake, soda pop and other desserts. You should also avoid packaged foods; they tend to have a lot of sugar and high fructose corn syrup added.
  • Deep fried foods and processed oils: Deep frying creates trans fats—highly inflammatory. The vegetable oils in the center aisle in the supermarket also need to be avoided. They are processed and extracted using heat and chemicals. Fats and oils are vital for making healthy cells and for hormone production. Processed oils and trans fats create inflammation and make unhealthy cells.
  • Chemical additives: If it comes in a bottle, box, or a can, it is probably not good for you. If it wasn’t available 10,000 years ago, it is probably not good for you. If there is a “list of ingredients”, avoid it like the plague. Eat whole food in its natural state.

Step 2: Take a Vacation from Complex Carbohydrates

It is not that complex carbohydrates are intrinsically bad. It is just that as a society, we eat too many of them. For many people, their ability to digest them has been compromised, so they begin to grow undesirable bacteria in the intestine. Taking a vacation from them can do wonders for your digestive tract. You also want to avoid disaccharides, which are sugars that need to be broken down by the digestive tract. This includes lactose, which is the sugar found in dairy products. You want to completely avoid:

  • Disaccharides: This includes lactose, which is in dairy and table sugar (sucrose), which you should be avoiding anyway. No dairy products.
  • Starchy food: This includes all grains (wheat, rice, soy, quinoa, oats etc.), potatoes, sweet potatoes, and beans (pinto beans, black beans etc.; not green beans).  

Step 3: Your Diet Should Be 75% Fresh Produce (By Volume)

The goal here is to develop a diverse ecosystem in your GI tract. The reason you take probiotics is to introduce new bacteria that will do good things for your body and your immune system. They make vitamins, keep “bad” bacteria in check, heal the digestive system, and remove toxins. These good bacteria feed on vegetable fiber. You want lots of different bacteria. This prevents overgrowth of “bad” bacteria. Here is why the produce (mostly vegetables, some fruit) can help:

  • Vegetable fiber feed bacteria. In fact, the more different kinds of vegetables you eat, the more kinds of bacteria grow. You want many diverse organisms for good health.
  • Polyphenols and carotenoids: These give color to fruits and vegetables. They are powerful antioxidants. Studies have shown that they help most chronic health issues.

Helpful Hints

  1. Dessert: Fruit, of course, is the dessert of choice. You can make gelatin, which can even help with healing the GI lining. Use Knox unflavored gelatin and use fruit juice instead of water when you make it.
  2. Bone broth: I have no idea the extent of your health problems. What is written above should work well for most people. If, however, you have an autoimmune disease, severe allergies, inflammatory bowel disease, you may need to aggressively work to heal the GI lining. Bone broth is perhaps the best way to do that. There are supplements, like colostrum, calcium butyrate, collagen, aloe and others that are designed to help heal the GI tract. In my opinion, bone broth is the best. See Appendix A for a recipe. Have a cup 1 or 2 times each day.
  3. Now take your probiotics: They will have a better chance of surviving. In fact, when you finish one bottle, buy a different brand. Try to get as many strains as possible.
  4. Juicing (juice only vegetables): Oddly enough, for many people, the most difficult thing to do is to get enough vegetables. Juicing is a way to get all the polyphenols and carotenoids. Critics of juicing (correctly) say that you are not getting the fiber from the vegetables. The solution is simple, eat the fiber. Put salt, pepper, oil and vinegar on it and eat it like cole slaw. If the vegetables are tasting strong, add an apple and some carrots to sweeten it (one apple—we don’t want it to be a fruit juice).

If you are able to do the above without problem—great! If following the above causes digestive distress or other issues, read on.

Part 2: Troubleshooting

If you have problems with part one, it doesn’t mean that what we are trying to accomplish is wrong. It’s just that you are not ready for it yet.

  1. Treat the GI tract from North to South: If you are not breaking down proteins, fats, and carbohydrates during the initial phases of digestion, they are rotting and growing an unhealthy microbiome. This is an area where you may need professional help.
  • Stomach HCl: “Hypochlorhydra” is an area where “alternative” practitioners are onboard, but traditional medicine does not take seriously. The solution is to take HCl halfway through a meal. It helps digest protein and keep it from “rotting” further down the line. Sometimes the stomach is so inflamed that taking HCl supplements is not well tolerated. Sometimes the culprit is H pylori, which needs to be tested for. You should get the help of a natural healthcare practitioner if you suspect that this is an issue. Click here to learn about hypochlorhydra.
  • Biliary stasis: Bile thickens and creates problems digesting fats and fat soluble vitamins. Click here to learn more. There is supplemental support.
  • Pancreatic enzymes: These help with digesting carbohydrates, fats and proteins. For the most part, you can take them safely.
  1. IBD sufferers often cannot tolerate a lot of fiber: Patients with Crohn’s disease or ulcerative colitis often cannot eat a lot of vegetables without flaring up. Juicing is a good solution for them—they can even eat some of the fiber (to tolerance). One way for them to get fiber is to take citrus pectin. Citrus pectin is a soluble, gel-forming fiber that is generally gentler on the intestinal lining than insoluble fibers. While tolerance varies, small amounts are often better tolerated than more abrasive or rapidly fermentable fibers, especially outside of active flare-ups.
  2. Some people do not tolerate lectins: Lectins are carbohydrate-binding proteins found in almost all plants, especially legumes, grains, and nightshade vegetables, serving as a natural defense against pests. Often called “anti-nutrients” they can inhibit nutrient absorption and cause digestive issues if consumed raw or undercooked. However, proper cooking, soaking, and fermenting break down these proteins, rendering them safe for most people. Juicing and citrus pectin may also be a solution for these people.
  3. FODMAP: Without going into a long explanation, these are constituents that feed undesirable bacteria causing IBS symptoms. Juicing solves the lectin problem, but not the FODMAP problem. The problem is that for a truly healthy gut, you want those vegetables. Sometimes it is a good idea to “bomb” the bad bacteria and start over. One gentle way to do this is to take berberine (500 mg, 3x/day) for two weeks. For the next two weeks, take Saccharomyces boulardii (3x/day). Repeat the cycle three times. Try to start the program, making sure to take pancreatic enzymes and a probiotic with each meal.

Frequently Asked Questions (FAQ)

Why do I need to keep taking probiotics?

Most probiotics do not permanently colonize the gut. They influence the microbiome temporarily, but without a supportive environment, they eventually disappear. Improving the gut environment allows beneficial bacteria to survive longer and work more effectively.

Does this mean probiotics don’t work?

No. Probiotics can be helpful, but their effects are usually short-lived unless the digestive tract is healthy. Think of probiotics as helpers, not permanent residents.

Why focus so much on inflammation?

Inflammation damages the GI lining, which serves as a barrier between the contents of the digestive tract and the rest of the body. A damaged lining interferes with digestion, enzyme production, and microbial balance, making it harder for probiotics to survive.

Why avoid complex carbohydrates temporarily?

Many people have difficulty digesting complex carbohydrates and disaccharides. When poorly digested, they can feed undesirable bacteria and worsen dysbiosis. A temporary break allows the digestive system to reset.

Why should 75% of the diet be fresh produce?

Vegetables and some fruit provide fibers and plant compounds that feed beneficial bacteria. Greater variety supports a more diverse and resilient microbiome, which helps prevent overgrowth of less desirable organisms.

If fiber is good, why do some people feel worse when they eat vegetables?

Not all digestive tracts tolerate fiber equally. Inflammation, dysbiosis, enzyme deficiencies, or bile issues can make high-fiber foods uncomfortable. This does not mean the approach is wrong — it may mean the gut needs additional support first.

Are gentle fibers better for sensitive digestion?

Yes. Soluble, gel-forming fibers (such as citrus pectin) are often better tolerated than insoluble or abrasive fibers, especially for people with inflammatory bowel disease or digestive sensitivity. Tolerance varies, and amounts should be individualized.

Can gelatin or bone broth really help the gut lining?

They provide amino acids used in connective tissue and mucosal integrity. Bone broth offers the broadest support, but gelatin can be a simple, supportive option — especially for those wanting a gentle dessert.

Will digestive enzymes stop my body from making its own enzymes?

No. Digestive enzymes work in the digestive tract and do not suppress pancreatic enzyme production. They are commonly used as temporary support while digestion improves.

What if this plan causes digestive distress?

That usually means the digestive tract isn’t ready yet. Addressing digestion from “north to south” — stomach acid, bile flow, and enzyme output — may be necessary before increasing fiber or produce.

How long do I need to do this?

Thirty days is usually enough to notice meaningful changes. Some people may benefit from longer periods, depending on how compromised their digestion is. The goal is improvement, not perfection.

Appendix A: Bone Broth

Ingredients

  • 2–3 lb bones
    (chicken carcass, chicken feet, beef marrow bones, or knuckles)
  • 2 Tbsp apple cider vinegar
  • Water to cover
  • Optional (not required):
    • 1 onion (quartered)
    • 2 carrots
    • 2 celery stalks
    • salt to taste after cooking

Instructions

  • Put bones in a large pot or slow cooker
  • Add vinegar and cover with water
  • Let sit 20–30 minutes (helps pull minerals from bones)
  • Bring to a gentle simmer
    • Do not boil hard
  • Skim foam if desired (optional)
  • Simmer:
    • Chicken: 8–12 hours
    • Beef: 12–24 hours
  • Strain, cool, refrigerate
  • Remove solid fat if desired (optional)