Is Yakult Good for Your Immune System?

Recently updated on March 2nd, 2023 at 11:42 pm

Have you heard about Yakult, the fermented dairy drink from Japan that has been gaining a lot of popularity around the world? People have been raving about its potential health benefits, claiming it can do wonders for your gut health, strengthen your immune system, and even help you lose weight.

But with so much conflicting information out there, it can be hard to know what to believe. That’s why we’re here to cut through the noise and take a closer look at whether Yakult really lives up to the hype as an immunity booster.

In this blog post, we will dive into the scientific research on Yakult and explore what it can and cannot do for your immune system. So grab a bottle of Yakult (if you have one handy) and let’s get started!

What is Yakult?

In the 1930s, a Japanese scientist named Dr. Minoru Shirota had a mission: to create a delicious and effective probiotic drink that would promote gut health and overall wellness. That’s how Yakult was born.

So, what makes Yakult so special? For one, it contains a unique strain of Lactobacillus casei Shirota, a superstar probiotic that can work wonders for your digestive system. And the best part? It’s a low-calorie and low-fat drink, so you can enjoy it guilt-free.

To make Yakult, the secret lies in the fermentation process. Skim milk and Lactobacillus casei Shirota are carefully combined and left to ferment, allowing the probiotics to work their magic. The end result? A scrumptious and mildly sweet drink that’s bursting with billions of good-for-you probiotics in every sip. So, not only is Yakult tasty, but it’s also an easy and convenient way to give your gut health a boost.

Are probiotics really good for the immune system?

Probiotics are live microorganisms that are believed to have health benefits when consumed in adequate amounts. They are commonly found in fermented foods such as yogurt, kefir, and sourdough bread, as well as in dietary supplements. The question of whether probiotics are good for the immune system is one that has been the subject of much research and debate.

On one hand, the gut microbiome is known to play a crucial role in maintaining a healthy immune system. Probiotics, as live microorganisms, can positively impact the gut microbiome and potentially improve immune function.

Research has shown that probiotics can help regulate the immune response and increase the production of antibodies and other immune cells. In addition, probiotics have been shown to have a beneficial impact on gut inflammation, which can have a positive effect on overall immune function.

However, it is important to note that not all probiotics are created equal and that their effects on the immune system can vary depending on the specific strain and the individual. Some studies have shown that certain probiotics can have a significant impact on the immune system, while others may have little to no effect.

Additionally, individual responses to probiotics can vary greatly and are influenced by factors such as diet, lifestyle, and pre-existing health conditions.

In conclusion, while probiotics have the potential to be beneficial for the immune system, more research is needed to determine their specific effects and to establish clear guidelines for their use.

Is Yakult good for the immune system?

As mentioned earlier, Yakult is made with a unique strain of Lactobacillus casei Shirota. In relation to the immune system, this specific strain has been the subject of multiple studies, with many of them being animal-based studies that have generally reported positive results.

However, there is limited evidence from human studies that suggest that drinking a probiotic drink containing Lactobacillus casei Shirota can help improve immune function.

For example, one study investigated the effects of daily consumption of a probiotic drink containing Lactobacillus casei Shirota on healthy adults for 4 weeks, followed by 6 weeks without the drink, and then 4 more weeks of consuming the drink.

The results showed that after 4 and 14 weeks of drinking the probiotic, there was a significant increase in the activation of T cells and natural killer cells, which are important for the immune response.

In addition, there was a decrease in the levels of certain inflammatory cytokines in the blood and an increase in the concentrations of certain antibodies in the saliva.

Overall, the findings suggest that consuming the probiotic drink had a positive impact on the immune system and provided a secondary boosting effect.

Another study found that drinking a probiotic drink made with Lactobacillus casei Shirota helped boost the activity of natural killer (NK) cells and made the immune response less inflammatory in older people. The results showed that the drink improved the activity of NK cells and reduced the signs of inflammation in the body.

However, another study that looked at the effects of consuming Lactobacillus casei Shirota over a period of 8 weeks did not find any significant difference in the immune system of healthy men. The results suggest that consuming L. casei Shirota-fermented milk can change the types of bacteria and how active they are in the intestine, but does not influence the immune system of healthy males.

Overall, while there is some evidence to suggest that consuming probiotic drinks made with Lactobacillus casei Shirota can provide a boost to the immune system, more research is needed to determine their exact effects. Additionally, individual responses to probiotics can vary greatly and are influenced by factors such as diet, lifestyle, and pre-existing health conditions.

Consuming Yakult Safely

Recommended Daily Intake

It is recommended to drink one bottle of Yakult (65 ml) per day as a dietary supplement. It is safe for most people, but it is always best to consult with a doctor before starting any new supplement or dietary regimen.

Side Effects and Precautions

Yakult is generally considered safe for most people. However, some people may experience side effects such as bloating, gas, or diarrhea.

People with weakened immune systems should avoid Yakult, as probiotics can increase the risk of infections in these individuals.

Diabetics should also use caution when consuming Yakult, as the drink contains sugar.

Additionally, people with allergies to dairy products should avoid Yakult due to its use of whey protein.


In this article, we discussed the potential benefits of Yakult, a probiotic drink, on the immune system. Yakult contains the proprietary strain of Lactobacillus casei Shirota, which has been shown to improve natural killer (NK) cell activity and produce a more anti-inflammatory cytokine profile in older adults.

Additionally, Lactobacillus casei Shirota has been found to have a secondary boosting effect on T cells (which play a crucial role in fighting off infections) and natural killer cells. Furthermore, it increases certain levels of antibodies found in saliva.

While the potential benefits of Yakult for the immune system are intriguing, more research is needed to fully understand the effects of consuming this probiotic drink. It’s important to remember that Yakult is not a cure-all and should not be used as a replacement for a balanced and nutritious diet, regular exercise, and good hygiene practices.

If you’re interested in using Yakult to support your immune system, it’s important to speak with your healthcare professional first. They can help you determine whether Yakult is right for you and provide guidance on the recommended daily intake based on your specific health needs.

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