{"id":150302316717,"date":"2024-04-11T21:36:39","date_gmt":"2024-04-12T01:36:39","guid":{"rendered":"https:\/\/bioptimizers.com\/blog\/?p=150302316717"},"modified":"2025-12-01T13:53:46","modified_gmt":"2025-12-01T18:53:46","slug":"how-do-probiotics-survive-stomach-acid","status":"publish","type":"post","link":"https:\/\/bioptimizers.com\/blog\/how-do-probiotics-survive-stomach-acid\/","title":{"rendered":"How Do Probiotics Survive Stomach Acid?"},"content":{"rendered":"\n

You probably know probiotics as healthy bacteria that support gut health and provide a range of positive overall wellness benefits. But they aren\u2019t as good to you if they\u2019re dead. Before probiotics can work their magic, they must survive stomach acid strong enough to break down everything from meat to tough, fibrous plants. <\/p>\n\n\n\n

In this article, we\u2019ll explore how probiotics survive the harsh stomach environment, what can kill them, and how you can maximize the benefits of these helpful bacteria. <\/p>\n\n\n\n

How Do Probiotics Survive Stomach Acid?<\/h2>\n\n\n\n
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Probiotics’ ultimate aim is to reach the large intestine and colon, where they can deliver health benefits. However, they encounter various hurdles within the digestive system before reaching their final destination.<\/p>\n\n\n\n

Before reaching the stomach, probiotics must endure exposure to the mildly acidic saliva in the mouth.  Lab studies show that such quick transit time has little effect on them.<\/span><\/span><\/p>\n\n\n\n

Once probiotics move from the throat to the stomach, they face a significant challenge: stomach acid. Your stomach generally has a pH of 2.5 to 3.5, but it can get as low as 1 or 2. <\/p>\n\n\n\n

Technical background: <\/strong>pH stands for \u201cpower of hydrogen ions,\u201d and it works on a log scale. 
The lower pH you have, the more hydrogen ions you have.
pH 1 means you have 0.1 molar, which is about 0.1 gram per litre.
pH 2 means you have 1\/10 of that, which is 0.01 gram per litre, and so on. 

That means pH 3 has 1\/10 hydrogen ions as pH 2 and 1\/1000 hydrogen ions as pH 1.  
pH 3 and pH 2 are 10 times different!<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

Your stomach acid can harm most bacteria, especially ones that can’t handle acid well. It reduces the pH of the cytoplasm of their cells, reducing their ability to work correctly.<\/span><\/p>\n\n\n\n

Here’s the fascinating part: many probiotics, such as Bifidobacteria<\/a>, Lactobacillus acidophilus<\/em>, and some other strains of Lactobacilli,<\/em> can survive in acids. They rely on an enzyme called F1F0-ATPase, which pumps hydrogen ions to regulate internal pH and produces energy (ATP) when encountering acid.<\/span><\/p>\n\n\n\n

This enzyme becomes more active and plentiful in acidic environments, enhancing probiotics’ ability to withstand harsh conditions.<\/p>\n\n\n\n

Other types of probiotics have an easier time surviving stomach acid, notably yeast-based probiotics like S. Boulardii<\/em> and spore probiotics from the Bacillus<\/em> genus. S. Boulardii <\/em>has a heightened tolerance to acidic pH, enabling survival even at levels as low as 2.<\/span><\/p>\n\n\n\n

Bacillus, <\/em>spore-based probiotics, get their strength from their exterior spore coat. The spore coat is a strong, layered shield made of proteins. It helps the organism keep its shape and keeps harmful substances out, which likely helps it survive tough conditions such as stomach acid.<\/span> <\/p>\n\n\n\n

Probiotics generally only stay in the stomach for a short time. Still, even this period can be difficult for them because of the acid and other stomach conditions like enzymes and churning. Not all probiotics can survive. The shorter they stay in the stomach, the greater their chance of survival.<\/p>\n\n\n\n

But the journey doesn’t end there. Even if probiotics survive the stomach, they must navigate through the small intestine, where alkaline fluids from the pancreas and liver (bile) can break down their outer layer and potentially harm their DNA.<\/span><\/p>\n\n\n\n

If probiotics successfully navigate the challenges, they eventually reach the colon, their final destination. However, the battle isn’t over yet. They must compete with existing gut bacteria for nutrients and space to survive and\/or establish themselves in the colon lining. Your body may expel them in stool shortly after consuming them due to the intense competition in your gut.<\/span><\/p>\n\n\n\n

So, after all of this, it almost seems unlikely that they\u2019ll actually survive long enough to support your health and wellness. The good news is that researchers have figured out ways to help them survive.<\/p>\n\n\n

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Supporting Probiotic Survival<\/h3>\n\n\n\n

To ensure enough probiotics reach your colon for health benefits, bacteria-based probiotic foods or supplements should have at least 10 billion colony-forming units (10,000,000,000 CFUs) per gram. This ensures that 6\u20137 billion CFUs per gram make it to your colon for therapeutic effects.<\/span><\/span><\/p>\n\n\n\n

Other forms of probiotics have lower recommended dosages for optimal efficacy. For yeast-based S. boulardii<\/em>, the recommended dosage is 1 billion CFUs.<\/span> On the other hand, spore-based probiotics in the Bacillus<\/em> genus are generally recommended at dosages ranging from 10 million to 1 billion CFUs.<\/span><\/p>\n\n\n\n

Probiotic Form<\/h4>\n\n\n\n

The chances of probiotic survival can hinge on their form. In a study that simulated stomach conditions, researchers observed the survival rates of probiotics. They gauged whether the colony numbers decreased by tallying live probiotic cells before and after this simulation.<\/span><\/p>\n\n\n\n

Sadly, the researchers found that out of the 11 probiotics tested, only two contained their initial labeled concentrations. If you\u2019re buying a probiotic that doesn\u2019t have the concentration on the label, you\u2019re already at a disadvantage. More on that later. <\/p>\n\n\n\n

Following the simulated stomach journey, most probiotics experienced a reduction in live cells, potentially diminishing their efficacy in promoting health. Notably, the probiotics that fared best after exposure to the stomach environment were those specifically from or packaged with fermented milk.<\/span><\/p>\n\n\n\n

Packaging probiotics in special microcapsules creates a protective coating that shields them from stomach acid, preserving their effectiveness. These tiny microcapsules are made using natural materials such as alginate, chitosan, gelatin, whey protein isolate, or cellulose derivatives. The packaging process to make probiotics more resistant to stomach acid includes techniques like freeze-drying, extrusion, or emulsion.<\/span><\/p>\n\n\n\n

Fermented milk probiotics might also keep them alive due to fat globules. Milk naturally has tiny fat droplets that can cover and protect the good bacteria from stomach acid and bile salts.<\/span> If you want to reap the benefits from probiotics in your yogurt, however, choose ones that are not pasteurized or heated in any way after the fermentation process.<\/p>\n\n\n\n

Our best probiotics, Probiotic Breakthrough<\/a>, are specially packaged in vegetable cellulose to help them resist stomach acid and bile salts. Our R&D department found that Probiotic Breakthrough showcased impressive performance compared to competitors regarding pH tolerance and bile resistance. <\/p>\n\n\n\n

At pH 2, Probiotic Breakthrough showed no growth, similar to most competitors, except for one containing digestive enzymes. Additionally, Probiotic Breakthrough demonstrated superior growth at pH 3 and thrived alongside other probiotics at pH 4.  Although Probiotic Breakthrough showed limited growth in high bile concentrations, Probiotic Breakthrough excelled in lower bile concentrations, emphasizing its resilience and adaptability. <\/p>\n\n\n\n

How Do You Know If Probiotics Are Alive?<\/h2>\n\n\n\n
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Probiotics might not work as well if they’re not handled right during processing, storage, or transportation. Factors that can affect their viability include:<\/p>\n\n\n\n