Short answer: mullein is generally considered well tolerated, and side effects from a filtered mullein spray are uncommon. Possible issues include mild throat or stomach irritation and allergic reactions in sensitive people. Human research is limited, so pregnant or nursing women, children and anyone with a medical condition or taking medication should ask a doctor first.
The safe way to order
Order BreathiZen only from the official website, choose 2, 3 or 6 bottles, and keep the 60-day money-back guarantee on every package.
Go to the Official BreathiZen Site →What Is Known About Mullein Safety
Mullein (Verbascum thapsus) has a long history of use as a tea and herbal preparation. Most of what we know about its safety comes from that traditional use and from laboratory studies; large clinical trials in people are scarce. Learn more about the plant in mullein leaf benefits for lungs.
Possible Side Effects
- Throat or mouth irritation. Raw mullein leaves have fine hairs that can irritate. This is mainly a concern with home-made, unstrained tea; extracts are filtered.
- Stomach upset. Some people notice mild nausea or discomfort, especially on an empty stomach.
- Allergic reactions. Anyone allergic to mullein or related plants should avoid it. Stop use if you notice rash, itching or swelling.
- Skin contact. Handling the fresh plant can cause skin irritation in some people.
The Other Ingredients in a Mullein Spray
Most sprays combine mullein with other botanicals. In BreathiZen the blend also contains:
- Ginger root extract. In food amounts, ginger is widely eaten. NCCIH notes possible mild effects such as heartburn, gas or stomach discomfort. Ask a doctor if you take blood thinners. More in ginger for respiratory health.
- Organic lemon extract. Generally well tolerated; people with citrus allergy should check with a doctor.
- Inactive ingredients. Purified water, glycerin, natural flavors, citric acid, potassium sorbate and sodium benzoate, which are common food-grade ingredients.
Who Should Talk to a Doctor First
- Pregnant or nursing women (safety data is lacking)
- Anyone under 18
- People with asthma, COPD or another diagnosed lung condition
- Anyone taking prescription medication, especially blood thinners
- People with known plant or citrus allergies
A supplement never replaces an inhaler or prescribed treatment. If you have shortness of breath, chest pain or a cough that won’t go away, see a doctor.
How to Start a Mullein Spray Safely
- Use only the labeled serving (for BreathiZen, 4 sprays once a day).
- Try it with food the first few days if your stomach is sensitive.
- Stop and contact your doctor if you notice any unusual reaction.
For product-specific details, read BreathiZen side effects & safety and how to use BreathiZen.
Frequently Asked Questions
Is mullein spray safe to use every day?
Mullein is generally considered well tolerated at labeled amounts, but long-term human research is limited. Use only the labeled serving and check with your doctor if you have a medical condition or take medication.
What are the side effects of mullein?
Reported side effects are uncommon and usually mild: throat or stomach irritation and, in sensitive people, allergic reactions. Stop use if you notice rash, itching or swelling.
Can I use mullein spray while pregnant?
There is not enough safety research on mullein in pregnancy or breastfeeding. Talk to your doctor before using it.
Sources & Further Reading
Educational note: This article is for informational purposes and does not constitute medical advice. BreathiZen is a dietary supplement and is not intended to diagnose, treat, cure, or prevent any disease. Consult a qualified healthcare professional for any medical condition.
Try BreathiZen Risk-Free for 60 Days*
Four quick sprays a day of mullein leaf extract 10:1, ginger root and organic lemon. No pills to swallow, no tea to brew. One bottle lasts about 3 months.
- 60-day money-back guarantee
- Made in the USA in an FDA-registered facility
- 100 servings (~3 months) per bottle
- Secure, encrypted checkout on the official site
Bundles lower your per-bottle price. Still deciding? Read our honest BreathiZen review →
*Affiliate Disclosure: This page contains affiliate links. We may earn a commission if you purchase through our links at no additional cost to you. These statements have not been evaluated by the FDA. This product is not intended to diagnose, treat, cure, or prevent any disease.