Mild stomach upset
The most common complaint for botanical liquids generally. Taking it with a little water afterwards usually settles it. Not published as a side effect of this product, because none are.
Official product information
Is BreathiZen Safe? Side Effects and Interactions
No side effects are published for this product. That is not the same as there being none, so here is the interaction list, the one real safety signal, and what to do about both.
Written and reviewed by the BreathiZen Editorial Desk · Last updated September 22, 2026
Quick answer
No side effects are published for BreathiZen. Six medication checks are worth making first: blood thinners, sedatives, blood-pressure medicine, anything absorbed on a schedule, liver medicine, and asthma or COPD medicine. The one documented safety signal in the formula is green tea extract, where uncommon liver-injury cases have been reported — and its amount is not published.
Check first
BreathiZen medication interactions
None of these means you cannot take it. All of them mean someone with your full medication list should look at the ingredients first.
Stop and call a clinician if you notice any of these
Yellowing of the skin or the whites of the eyes, dark urine, pain on the right side under the ribs, or unusual tiredness that has no other explanation. These are the signs associated with the liver-injury reports for green tea extract. They are uncommon. They are also the reason a product containing green tea extract should print an amount, and this one does not.
| If you take… | Because of… | What to do |
|---|---|---|
| Blood thinners | Bromelain powder, ginger root extract | Both may add to the effect. This is the check most worth making. |
| Sedatives, sleep medicine or alcohol | California poppy seed, corydalis root | Both are traditional calming herbs and may add to sedation. |
| Blood-pressure medicine | L-theanine, corydalis root | May add to the effect. The sales FAQ names high blood pressure directly. |
| Anything absorbed on a schedule | Marshmallow root | Mucilage can slow absorption of other medicines. Leave a couple of hours. |
| Medicine that affects the liver | Green tea extract | The one documented safety signal here. Ask before starting. |
| Asthma or COPD medicine | The formula as a whole | The sales FAQ says to show the label to a clinician first. Do that. |
The honest section
The one ingredient that needed a number
Green tea extract is the ingredient on this label that needs a number, and it is the one that does not have one.
NCCIH's review is specific: liver injury has been reported in people taking green tea extract. The cases are uncommon. They appear more often in people carrying a particular variant in an immune-function gene, found in roughly 5 to 15 percent of Americans — a variant almost nobody has been tested for. The risk is associated with concentrated extracts rather than with drinking tea.
So the practical question for a buyer is how much extract is in a daily serving of BreathiZen, and the answer is that nobody outside the manufacturer knows. It might be a token amount. It might not. The label does not say, and neither does the product pack we were given.
We are not telling you the product is dangerous. We are telling you that the one place a number was genuinely needed is the one place it is missing, and that if you have any history of liver trouble this is a conversation to have with a clinician rather than a risk to take on a guess.
What is not published about side effects
- No side-effect list of any kind appears in the material supplied to us.
- No caffeine figure is published for the green tea extract.
- No contraindication list appears beyond the sales FAQ's line about asthma, COPD and blood-pressure medicine.
- No pregnancy or breastfeeding statement appears beyond the adults-only age line.
In practice
What people usually report
No side effects are published for this product. These are the ones botanical liquids generally produce, offered as a realistic expectation rather than as a claim about this bottle.
A taste you do not like
Ten botanical extracts in a liquid taste like ten botanical extracts. Organic lemon extract is in the formula for this reason. Some people still will not get on with it.
Drowsiness
Plausible given California poppy, corydalis and L-theanine, especially alongside anything else sedating. The serving is a morning one, which helps.
Nothing at all
The outcome two of the eight named reviewers described in week one. It is a legitimate result and it is worth expecting rather than being surprised by.
Rules
Who should not take it, and how to report a problem
Nobody should be under 18 taking this. Nobody should take it while pregnant or breastfeeding. Both of those follow from the label's own age line and from the absence of any safety data for those groups — and an absence of data is not the same as a clean record.
Beyond that, the clearest framing comes from NCCIH's advice on supplements generally: tell your health care providers about any complementary approach you use. That single habit catches most interaction problems before they happen, and it costs one sentence in an appointment you were having anyway.
It is also worth remembering what the FDA's role here actually is. The agency is not authorised to approve dietary supplements for safety and effectiveness before they are marketed. A seal reading “made in an FDA-registered facility” describes a factory's registration, not a review of the product. Neither statement means a supplement is unsafe; both mean the safety check you get is the one you do yourself.
Reporting something
Tell the order desk on +1 (302) 200-3480 and tell your own clinician. If you want the report to go further than the seller, the FDA's consumer page explains how adverse events from supplements are reported in the United States.
Summary
The one-minute version of this page
Take the ingredient list to a pharmacist if you take anything regularly, especially blood thinners, sedatives or blood-pressure medicine. Do not take more than four pumps. Stop and call someone if your skin or eyes yellow, your urine darkens, or you are unusually tired with no explanation.
Beyond that, the honest summary is that this formula's ingredients are common in supplements, that no side effects are published for this product, and that the single biggest unknown is how much of anything is in it.
Questions
BreathiZen FAQ: safety and side effects questions
Is BreathiZen safe?
For most healthy adults the named ingredients are common in supplements. Two things deserve care: green tea extract, where liver injury has been reported uncommonly, and the fact that no amount of anything is published.
Are there side effects?
None are published for this product. Botanical sprays most often cause mild stomach upset or a taste people dislike. Report anything else to the order desk and to your clinician.
Who should not take it?
Anyone under 18, anyone pregnant or breastfeeding, and anyone with a liver condition without speaking to a clinician first. The sales FAQ adds that if you take medicine for asthma, COPD or high blood pressure, show the label to a clinician before you start.
Does it interact with medication?
Several ingredients can. Bromelain and ginger may add to blood thinners. California poppy and corydalis may add to sedatives. L-theanine may add to blood-pressure medicine. Marshmallow root can slow how fast other medicines are absorbed.
Is green tea extract a real concern?
It is the one ingredient here with a documented safety signal. NCCIH reports that liver injury has been reported in people taking green tea extract, uncommonly, and more often in people with a particular gene variant found in 5 to 15 percent of Americans. Stop and call a clinician if you notice yellow skin, dark urine or unusual tiredness.
Is it FDA approved?
No dietary supplement is. The FDA is not authorised to approve supplements for safety and effectiveness before they are sold. A seal saying "made in an FDA-registered facility" describes the factory's registration, not the product.
References
Sources for this page
- National Center for Complementary and Integrative Health. Green Tea: Usefulness and Safety. www.nccih.nih.gov. Accessed September 22, 2026.
- National Center for Complementary and Integrative Health. Using Dietary Supplements Wisely. www.nccih.nih.gov. Accessed September 22, 2026.
- U.S. Food and Drug Administration. Information for Consumers on Using Dietary Supplements. www.fda.gov. Accessed September 22, 2026.
- NIH Office of Dietary Supplements. Dietary Supplements: What You Need to Know. ods.od.nih.gov. Accessed September 22, 2026.
- National Center for Complementary and Integrative Health. Asthma and Complementary Health Approaches: What You Need To Know. www.nccih.nih.gov. Accessed September 22, 2026.
Order BreathiZen once you have run the checks
Published prices run $49 to $89 a bottle with a 60-day money-back window. Order desk +1 (302) 200-3480.
60-day money-back window · ships from inside the US · order desk +1 (302) 200-3480