ingestible · for seasonal allergies
Probiotics
Reviewed by the Nimbera editorial team · Last updated May 2026
How to use
Take a multi-strain or single-strain probiotic supplement containing at least 5-10 billion CFU per day. Strains most studied for allergic rhinitis include Lactobacillus paracasei LP-33, L. rhamnosus GG, L. acidophilus, and Bifidobacterium longum. Take daily ideally starting 4-8 weeks before pollen season and continuing throughout.
How it works
Probiotic supplementation shifts the immune balance from a pro-allergic Th2-dominant response toward a Th1/regulatory T-cell profile, reducing overproduction of IgE and inflammatory cytokines (IL-4, IL-5, IL-13). Certain strains also enhance the gut epithelial barrier and modulate dendritic cell activity, dampening systemic allergic sensitisation.
Where to buy
Culturelle (L. rhamnosus GG), Garden of Life Dr. Formulated Probiotics, Renew Life Ultimate Flora, and Align Probiotic are well-known brands available at pharmacies and online. For LP-33 specifically, look for NOW Foods or Natren. Refrigerated products from health food stores typically maintain better viability.
Typical cost: $15-$40 per month depending on brand and CFU count
Safety notes
Generally very safe for healthy adults. Immunocompromised individuals should consult a doctor before taking probiotics due to rare risk of bacteraemia. Mild digestive side effects (bloating, gas) may occur in the first 1-2 weeks and typically resolve. Probiotic effects are strain-specific - not all probiotics have evidence for allergic rhinitis. Do not substitute probiotics for prescribed allergy medications, antihistamines, or nasal corticosteroids if symptoms are moderate to severe.
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
Luo 2022 - Frontiers in Immunology (PMID 35663980)This 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.