Probiotics for Allergies

Kerry Beeson BSc (Nut. Med.) Nutritional Therapist

Hay fever season is officially here. With the spring sunshine, comes a certain amount of misery to sufferers across the Western Hemisphere every year. However with mounting evidence linking gut health with allergies, we might have the answer to all of your allergy woes!

woman sneezing into hands

The misery of hay fever is obvious, but for many, allergies are an invisible danger

Despite the increasing numbers of people affected each year, the public remain largely ignorant of the negative and life-altering effects that allergies can have on the lives of sufferers, so there is an urgent need to address this often dangerous health issue. Some allergies, such as hay fever, are obvious to all as the misery of sneezing, runny noses and itchy eyes are very apparent. But for other sufferers, allergies are an invisible and sometimes life-threatening consideration which can dominate their daily lives.

So could taking probiotics help with allergies?

It isn’t immediately obvious to most people how supplementing with probiotics or friendly bacteria could help allergy sufferers. But the question is an interesting one, given that 70% of our immune cells are located in our intestinal tract, and that our resident gut microbiome not only interacts with the immune system but can help to modulate its responses- incredible!1

In theory, most beneficial bacteria could have some positive effect on immune function merely by helping to improve gut health, but the research is a fast-growing, and new information is being discovered all the time about the different bacterial strains and their individual potential.

Which probiotic strains have been researched in those with allergies?

Lactobacillus acidophilus NCFM® - the most extensively-researched strain of L. acidophilus in the world - was used in a study where it was given to sufferers of allergic rhinitis caused by birch pollen2. This strain can be found in Optibac Every Day EXTRA.

For every day Extra Strength probiotics
Optibac Every Day EXTRA contains Lactobacillus acidophilus NCFM® 

Studies have also been done assessing the effectiveness of Lactobacillus rhamnosus CGMCC against peanut allergy3 and Lactobacillus rhamnosus LGG®  against eczema and other atopic conditions4. Healthcare practitioners can visit the Probiotics Database to find out more about Lactobacillus acidophilus NCFM® and Lactobacillus rhamnosus LGG®.

There are too many allergens to mention them all, as individuals can react to almost any type of food or substance. However, some allergens such as: pollen, tree spores, and foods such as peanuts, gluten/wheat, soya and dairy are some of the most common triggers. 

Histamine – a double-edged sword

We all know histamine as the inflammatory substance produced by the body in a typical hay fever reaction, for which anti-histamine drugs are the most popular conventional treatment. But not so many people are aware that histamine is also present in many foods and can create a wide range of allergenic symptoms if the individual lacks the specific enzyme in the body, Diamine Oxidase (DAO), to effectively break this substance down. Low levels of DAO leave high serum levels of histamine circulating in the blood causing a variety of inflammatory symptoms.

Causes of histamine intolerance are thought to be intestinal permeability ('leaky gut') and SIBO (small intestinal bacterial overgrowth). So in theory a high quality probiotic could be helpful in supporting gut health in those with histamine intolerance.

The little research we have seen suggests that some strains may help to alleviate histamine intolerance by down regulating IgE and histamine receptors, and up-regulating anti-inflammatory agents in the intestinal wall, helping to repair damage and reduce permeability5. For more information, healthcare practitioners can see our information page ‘Which probiotics for histamine intolerance?’

roasted peanuts

Some food allergies can be life-threatening

Can probiotics help with food allergies and intolerances?

Many people are confused by the difference between a food intolerance and a food allergy. The primary difference is that whilst food intolerances can be very unpleasant, food allergies can be life-threatening.

A food allergy generally shows up as an immediate swelling of the face and airways and is an urgent condition requiring medical attention. It is often brought on by exposure to only a small amount of the trigger 'substance' or food.

However, an intolerance is seen as a more gradual response, generally manifesting only as uncomfortable digestive symptoms, and is usually only brought on following exposure to a significant amount of the trigger substance.

Due to the fact that our gut microbiota may help to keep the gut healthy and break down and digest certain foods, those with food intolerances sometimes find that taking live cultures can help improve digestion and gut integrity such that tolerance to offending foods may be improved.

This would not be the same in the case of food allergies however, and trigger foods must always be avoided by allergic patients.

Healthcare practitioners may also like to read this blog post about Probiotics and lactose intolerance.

Why do allergies develop?

The reason why we develop allergies is still poorly understood, but it is a subject of great concern to the medical profession as these inappropriate physical responses are a growing concern worldwide6.

The World Allergy Organization (WAO) warns that "the prevalence of allergic diseases worldwide is rising dramatically in both developed and developing countries."

Allergies can take many different forms, encompassing reactions ranging from mild to dangerous anaphylactic reactions. Whilst food intolerances are generally the result of poor digestion or ‘leaky gut’, where incompletely digested molecules of food pass through into the bloodstream triggering an immune response from an antibody, or immunoglobulin. A true allergy involves the immune system, and in particular a specific immunoglobulin called IgE (a type of antibody), which is implicated in anaphylaxis.
Health professionals can read more about ‘leaky gut’ over on the Professionals site. 

Allergies can also present without warning at any time, often affecting sufferers late in life and causing reactions to foods or environmental stimuli that have previously been well-tolerated.In particular, more and more children are presenting with allergenic symptoms, with the latest statistics indicating that more than 50% of children in the United Kingdom now suffer from some form of allergy.

Evidence7 suggests that babies born via Caesarean section have an increased risk of developing allergies in later life. A natural vaginal birth exposes babies to bacteria from their mother as they pass down the birth canal, plays an important role in the development of the immune system and gut microbiota.

Certain individuals seem to be more pre-disposed towards allergy development: the medical profession terms these people ‘atopic.’ Th eowrd 'atopic' is derived from the Greek language and means something ‘out of place’ or ‘unusual’ – this predisposition to be ‘different’ appears to be genetic and can run in families.

Atopic family history – can anything be done?

There are conventional medications that act to reduce allergenic symptoms, such as anti-histamines and steroids, but avoidance of the known allergen is still one of the most effective methods of controlling reactions. This can be difficult when the allergen is widespread, as with pollens or tree spores that are spread throughout the environment in certain seasons and countries.

newborn with mild eczema on face

Eczema can make childhood a misery for some children

Considering that most of our beneficial gut bacteria is initially passed on to us from our mothers via the birth canal during natural childbirth, this predisposition could be traced back to a family history of unbalanced gut flora. Research is beginning to suggest that supporting gut health via the use of live cultures may help to prevent so-called atopic symptoms such as eczema.

A Dutch study8 from 2013 suggested that in atopic dermatitis running in families could be alleviated by improving the populations of beneficial microbiota:

“The results of this study are supportive for a role of the microbiota in the development of AD (Atopic dermatitis). Moreover, the beneficial influence of older siblings on the microbiota composition suggests that this microbiota may be one of the biological mechanisms underlying the sibling effect.”

If you would like to read more about how the microbiome influences the health of your baby you can read Dr. Kates in-depth article here: Baby Probiotics.

For more reading on this fascinating subject, healthcare practitioners might be interested in these other related articles:

Probiotics can help peanut allergies in kids, says new study

New study suggests probiotics can improve cow's milk allergy in infants

Could probiotics be the answer to peanut allergy?

N.B: This blog post was reviewed and updated in April 2019.


  1. Montalban-Arques A et al (2015) Selective Manipulation of the Gut Microbiota Improves Immune Status in Vertebrates, Frontiers in Immunology. Oct 9;6:512. doi: 10.3389/fimmu.2015.00512. eCollection 2015.
  2. Ouewhand, A.C. et al., (2009). ‘Specific probiotics alleviate allergic rhinitis during the birch pollen season’. World Journal of Gastronenterology. 15(26): 3261-3268.
  3. Mimi L.K. Tang, Anne-Louise Ponsonby, Francesca Orsini, Dean Tey, Marnie Robinson, Ee Lyn Su, Paul Licciardi, Wesley Burks, Susan Donath. Administration of a probiotic with peanut oral immunotherapy: A randomized trial. Journal of Allergy and Clinical Immunology, .2014.11.034
  4. Lundelin K. et al., (2017), ‘Long-term safety and efficacy of perinatal probiotic intervention: Evidence from a follow-up study of four randomized, double-blind, placebo-controlled trials’. Pediatr. Allergy Immunol., 28(2):170-5
  5. Dev, S., Mizuguchi, H., Das, A. K., Matsushita, C., Maeyama, K., Umehara, H., ... & Fukui, H. (2008). Suppression of histamine signaling by probiotic Lac-B: a possible mechanism of its anti-allergic effect. Journal of pharmacological sciences, 107(2), 159-166
  6. Pawankar R, Canonica GW, ST Holgate ST, Lockey RF, Blaiss M. The WAO White Book on Allergy (Update. 2013)
  7. Henry Ford Health System. "Babies born by C-section at risk of developing allergies." ScienceDaily. ScienceDaily, 25 February 2013. <>.
  8. Penders et al (2013) Establishment of the intestinal microbiota and its role for atopic dermatitis in early childhood. J Allergy Clin Immunol. 2013 Sep;132(3):601-607.e8. doi: 10.1016/j.jaci.2013.05.043. Epub 2013 Jul 27.