ingestible · for hay fever (seasonal allergies)
Probiotics (Lactobacillus and Bifidobacterium)
Reviewed by the Nimbera editorial team · Last updated May 2026
How to use
Take a multi-strain probiotic containing at least Lactobacillus acidophilus and Bifidobacterium longum (10-20 billion CFU) daily, ideally starting 4-8 weeks before allergy season and continuing throughout.
How it works
Gut microbiome composition influences systemic immune regulation. Specific probiotic strains shift the immune response away from the Th2-dominant allergic pattern by promoting regulatory T cells and reducing IgE production.
Where to buy
Health food stores, pharmacies, Amazon - Culturelle, Garden of Life, Jarrow Formulas are well-regarded brands
Typical cost: $20-$40 per month
Safety notes
Generally very safe for healthy individuals. Those who are immunocompromised or have central venous catheters should consult a doctor first. Effects are strain-specific - results vary by product.
Drug & supplement interactions
- Always tell your doctor or pharmacist about any supplements you take.
- Interactions can occur with prescription medications, blood thinners, and immunosuppressants.
- Herbal remedies can affect how the body absorbs or metabolises drugs.
- Check drugs.com interactions checker before starting.
Clinical source
PubMed - Kawase et al. 2009This information is compiled from primary clinical literature and is for informational purposes only. It is not a substitute for professional medical advice. Read our full disclaimer.