Probiotics for Autism: Supporting the Gut-Brain Connection

“Probiotics for Autism: Supporting the Gut-Brain Connection” was written by Tia Obeid and edited/reviewed by Maurya Hart BSc, RD and Jackie Silver MHSc, RD.

Medical Disclaimer: The information in this article is meant for educational purposes only. It is not intended to be personalized medical or nutrition advice. For a plan tailored to your needs, please consult with a Registered Dietitian or qualified healthcare professional.

Disclosure: This post may contain affiliate links with which I may earn a small commission but at no additional cost to you. Affiliate links help bloggers like me to provide you with free content. All opinions expressed here are genuine. 

Last updated: May 6, 2025

Introduction: Probiotics for Autism – Why Gut Health Matters

Many autistic children and adults experience digestive issues such as constipation, bloating, abdominal discomfort, and diarrhea. These gut-related symptoms can significantly impact daily life, contributing to discomfort and distress. Interestingly, research suggests a strong link between gut health and brain function, often called the “gut-brain axis.”

Studies indicate that the gut microbiome, the community of bacteria in our digestive system, plays a role in both gut and brain health. Some researchers think that imbalances in gut bacteria may contribute to gastrointestinal (GI) symptoms and may even influence behaviour (e.g., communication, sensory awareness) in autistic people.

This article explores the potential role of probiotics for autism in supporting digestion, mental health, and behaviour in autistic individuals.

What Are Probiotics & How Do They Work?

Probiotics are beneficial bacteria that help maintain a healthy balance in the gut. These “good” bacteria support digestion, strengthen the immune system, and may improve mental health. In autistic people, probiotics could improve some aspects of behaviour such as sociability, cognitive awareness, and communication. 

Because probiotics are live bacteria, they need to eat too. In our gut, probiotics feast on specific types of fibre called prebiotics. It’s important to include both probiotics and prebiotics in your diet to support a healthy gut microbiome.

Food Sources of Probiotics vs. Prebiotics 

• Probiotics: Live beneficial bacteria in fermented foods (like kefir, kombucha, kimchi) and supplements.
• Prebiotics: Fiber-rich foods (like bananas, onion, garlic, and oats) that feed beneficial gut bacteria.

Potential Benefits of Probiotics for Autism

The gut and brain are connected through the gut-brain axis, a communication pathway linking digestive health to mood and behaviour. Research suggests gut bacteria influence brain function by producing molecules that send messages from your brain to the rest of the body, and regulating inflammation.

Studies show that autistic individuals often have different gut bacteria compared to neurotypical individuals. Imbalances in gut bacteria (dysbiosis) may contribute to GI symptoms (such as constipation, abdominal pain, bloating), behaviour (communication, irritability, social withdrawal) and mental health (anxiety, depression) in autistic individuals. 

Some researchers believe that improving gut health with probiotics could help manage some symptoms by restoring microbial balance and reducing gut inflammation. Some individuals have found that adding probiotic-rich foods or supplements to their routine helps improve gut function and makes eating more comfortable.

Recent research has begun to investigate the impact probiotics may have on mental health and behavior in autistic individuals. For example, a recent review found a trend toward improved anxiety levels in autistic children and adolescents who took probiotics. 

Probiotics may also have potential benefits on depression related symptoms. Another review found that probiotic supplementation may improve communication, sociability, sensory and cognitive awareness in autistic children and adolescents. Some examples of improvements in these autistic kids and teens who used probiotic supplements were interacting with people and their environment; being less likely to cry often or have tantrums; and, experiencing fewer sleep problems. 

One study found that the biggest improvements in behaviour were observed in children who also had GI problems, highlighting the link between gut and brain health. While probiotics aren’t a cure, they may be a helpful tool in a broader approach to supporting both gut and mental health.

If you or your child are struggling with digestion, our team of dietitian nutritionists at Jackie Silver Nutrition is here to help. We specialize in supporting neurodivergent individuals – including autistic kids, teens, and adults – with personalized, judgment-free nutrition strategies that actually work for your brain, gut and body.

Choosing the Right Probiotics for Autism

When introducing probiotics, starting with food sources can be an easy and natural way to support gut health. Here are some options, along with ways to make them more enjoyable for different taste and texture preferences.

Best Food Sources of Probiotics for Autism

Kefir and Yogurt: Smooth & Familiar

Kefir and some types of yogurt are well-known sources of probiotics, and lactose-free or plant-based options like almond, coconut, or soy versions often contain probiotics as well. Kefir is a fermented milk drink that has a slightly sour and tangy taste.

Please note that yogurt is made with live cultures but not all yogurts have bacteria that is clinically proven to be beneficial to human health. Pro tip: look for “active probiotic cultures” to make sure that your yogurt contains probiotics, such as Activia yogurt.

• Serve plain yogurt with a drizzle of honey or maple syrup if sweetness is preferred.
• Blend into a smoothie with bananas, berries, or peanut butter for a thicker texture.
• Freeze into popsicles for a fun, cool treat.
• Enjoy cereal with kefir or add kefir to a smoothie instead of milk.

Sauerkraut and Kimchi: Crunchy & Flavorful

Sauerkraut and kimchi are both types of fermented cabbage; sauerkraut has a tangy, slightly sour taste, while kimchi is often spicy and packed with bold flavors.

• Mix a small spoonful into scrambled eggs or a rice bowl.
  Add into a stir fry with rice or noodles, vegetables, and a protein!
• Add a small amount to hotdogs or hamburgers for a delicious topping
• Serve a tiny portion alongside a preferred food (e.g., next to a grilled cheese sandwich). Here is a recipe for kimchi grilled cheese.

Miso: Warm & Savory 

Miso is a seasoning paste made from fermented soybeans, typically used in Japanese cooking. It has a salty, rich, umami flavor.

• Stir into warm (not boiling) broth to make miso soup with soft tofu and rice noodles.
• Mix into mashed potatoes or a mild sauce for extra umami flavour.
• Use a little in homemade dips or spreads for sandwiches.
  

Tempeh: A Plant-Based Protein Source

Tempeh is made from fermented soybeans and is a great plant-based source of protein originating from Indonesia. It is usually bought in a block form, which can be cut into pieces or crumbled, and has a flavorful nutty taste and firm texture. 

• Slice and cook in a mild sauce (e.g., teriyaki or BBQ) for a familiar flavour.
• You can make delicious tempeh bolognese.
  Crumble into pasta sauce or tacos for added protein. Try this tempeh taco recipe.
• Bake into bite-sized nuggets with a crispy coating. Tempeh has a firm texture, making it a good option for individuals who prefer structured foods over soft or mushy textures. Try out this recipe for air fryer tempeh nuggets!

Kombucha: Fizzy & Refreshing
Kombucha is a fermented tea drink that’s naturally fizzy and slightly tangy, with flavors ranging from fruity to floral depending on the brew. It’s rich in probiotics and a fun way to add variety to hydration.

• Serve cold in a small glass with a fun straw as an alternative to soda.
• Use as a mixer with fruit juice for a light spritzer.
• Check out these kombucha mocktail recipes.
• Pour into popsicle molds with fruit slices for a probiotic-rich frozen treat.

Supporting Gut Health with Prebiotics

Pairing probiotics with prebiotics (fiber-rich foods that feed good bacteria) can enhance their benefits. Foods like onion, garlic, some fruits and vegetables, grains, and legumes provide the fuel that probiotics need to thrive.

• Onion and garlic – Chop and add to stir frys, pasta sauces, salads and much more!
• Bananas and apples – Eat as a snack, slice over yogurt, or add into pancake batter or muffins.
• Oats and barley – Make overnight oats with fruit and nuts, add to smoothies, or bake into muffins.
• Beans and lentils – These are great in soups, blended into dips like hummus, or tossed into salads.
• Asparagus, leeks, artichokes, and mushrooms – Delicious roasted with olive oil and salt, added to stir-fries, or chopped into omelets. Try making a delicious potato leek soup or Mediterranean roasted artichokes.

If you’re interested in adding more probiotics and prebiotics into your diet, but you feel like you need more support, check out our 1-on-1 nutritional counselling services at Jackie Silver Nutrition! Our team of dietitians specializes in neurodivergent populations, including autistic children and adults, to meet your needs and goals.

​​Whether you’re in Toronto (Ontario), New York City, New Jersey, or nearby states, we are committed to helping you achieve your health and wellness goals with personalized, compassionate care.

Probiotic Supplements: What to Look For

Probiotic supplements are another way to support gut health. When choosing a probiotic supplement, look for:

1. Strain Type

Commonly researched strains include Lactobacillus and Bifidobacterium, known for their positive effects on digestive and immune health. Different strains offer varying benefits, so choosing a product with strains that have been scientifically studied is crucial.

2. Quality & Safety

Ensuring the probiotic supplement has been tested for purity and efficacy is vital. Look for products that have undergone third-party testing, which verifies that the supplement contains the ingredients listed on the label without harmful contaminants. In Canada, reputable third-party certification programs include:​

• ISURA: Canada’s only independent, not-for-profit natural health supplement and food product verification and certification organization. ​
  
• NSF International: An organization that offers independent testing and certification for dietary supplements, ensuring they meet stringent quality standards. ​

Products certified by these organizations often display their logos on the packaging, indicating they have met rigorous testing standards.​

3. Colony-Forming Units (CFUs)

CFUs measure the number of viable (living) microorganisms in a probiotic supplement. A general guideline suggests that a dose of at least 1 billion CFUs per serving is beneficial, though the optimal amount can vary depending on the specific strains and intended health benefits. It’s advisable to consult with a healthcare professional to determine the appropriate CFU count for your individual needs. ​

By paying attention to these factors, you can make informed decisions when selecting a probiotic supplement that aligns with your health goals.

Things to Consider Before Taking Probiotics for Autism

Before starting probiotics, it’s important to consider individual needs and consult a healthcare provider, especially if there are underlying medical conditions or sensitivities.

Consulting a Healthcare Provider

While probiotics are generally safe, a healthcare professional can help determine the best approach based on an individual’s health history and digestive needs.

Please note that probiotic supplements may not be safe for people on immunosuppressant medications. Please ask your doctor before starting a new supplement.

Possible Side Effects

When starting probiotics, some people may experience mild bloating, gas, or temporary digestive changes. These effects typically fade as the body adjusts.

Introducing Probiotics Slowly

To avoid discomfort, introduce probiotics gradually:

• Start with a small amount (e.g., a spoonful of yogurt or a low-dose supplement).
• Increase slowly over time if tolerated well.
• Pay attention to how the body responds, and adjust as needed.

What brand of probiotics do you recommend?

This is a personal decision and may be best discussed with your healthcare provider. You can keep in mind our suggestions above when looking for a supplement. 

It also depends on the specific need you are looking for in a probiotic supplement. 

We like using this probiotic chart for US brands because they only recommend brands that have been clinically tested to have benefits. They recommend brands for kids and adults.

This version has clinically tested Canadian brands.

Because different laws exist about how probiotics are labelled, many probiotics supplements do not actually contain what is written on their bottle. Some probiotic supplements report the weight of microorganisms, rather than CFUs. This is misleading as the weight may include both live and dead bacteria, and the benefits of probiotics only come from live bacteria. It’s also important to look for probiotics that report CFUs at the end of the shelf life. This means that the CFUs reported on the label will still be active until the time that you finish taking the supplement.

Probiotics are not a one-size-fits-all solution, but for some autistic individuals, they may offer valuable support for digestion, mood, and overall well-being. Exploring different probiotic foods and strategies can help find what works best for each person.

If you want to add more probiotic and prebiotic foods to your diet, a registered dietitian can help! At Jackie Silver Nutrition, our one-on-one virtual nutrition counselling is tailored to autistic people, using strategies that fit their specific situation and needs. Book a free discovery call to learn more!

Are Probiotics a Game Changer for Autism?

Probiotics for autism have gained attention for their potential to support digestion and behavior, but they are not a cure for autism. Autism is a neurodevelopmental condition with diverse experiences, and what helps one individual may not have the same effect on another. While probiotics may play a role in gut and brain health, they should be seen as just one tool in your toolbox

A Holistic Approach to Gut & Brain Health

Supporting gut health goes beyond probiotics. A well-rounded approach includes:

✔ A balanced diet: Incorporating a variety of nutrient-dense foods, including fibre-rich prebiotics, healthy fats, and proteins.
✔ Sensory-friendly foods: Finding ways to make new foods more appealing based on texture, temperature, and taste preferences.
✔ Gut-friendly habits: Staying hydrated, eating fibre-rich foods, and managing stress (which can impact digestion).

Each autistic individual has unique needs, so a flexible, personalized approach is key. Our team of dietitians can help you meet your nutrition-related goals, whether they are to reduce constipation, add more probiotics to your diet, or more! Book a free discovery call to see what we could work on together.

Final Thoughts & Practical Tips

If you’re considering probiotics for yourself or a loved one, here are some practical steps:

✅ Start with food sources first. Before trying supplements, introduce probiotic-rich foods in enjoyable, familiar ways.
✅ Track changes in digestion, mood and behavior. Keep a simple food and symptom journal to note any improvements or sensitivities.
✅ Seek personalized guidance. A dietitian or healthcare provider can help create a gut-friendly approach tailored to individual needs.

While probiotics for autism are not a one-size-fits-all solution, they may offer benefits as part of a broader strategy for supporting gut health, digestion, and overall well-being.

👉 Check out these other neurodivergent-friendly blog posts:

• Working with an Autism Dietitian 
• Autism and Constipation
• Autism and Food Aversion
• The Ultimate Guide to Vitamins for Picky Eaters
• Autism Safe Foods: Foods for Sensory Sensitivity

Have you tried adding more probiotics to your diet? What were your favorite foods or supplements? Let us know in the comments below!