health
Histamine Release
Adverse effectHistamine Release is an adverse health-related effect in which the body releases histamine. It describes a biological response rather than a general measure of product quality or effectiveness.
Histamine Release is classified as a health-related effect, offering a focused starting point for understanding the topic.
These are research findings, not promises. Most options have little evidence, and results differ from person to person.
What can cause it
How likely each one is to cause it, most likely first.
Forest Bathing (Shinrin-yoku)practicesimple.meter.userReports
Based on one study.
Open the Forest Bathing (Shinrin-yoku) page
The expert view shows every study, dose protocol and source.
What can cause it
Interventions reported to bring this on1 listedHighest probability
- →PracticesForest Bathing (Shinrin-yoku)CertaintyLowSourceAnecdotal1 other source
Exposure to terpenes and fungal spores in forest air may trigger histamine release in sensitive individuals, leading to nasal congestion, headache, or fatigue.
How to read the evidence
Evidence tier — overall strength of the evidence for the whole compound
- StrongWell established — backed by strong, consistent human research.
- ModerateSome genuine support, but mostly from small or lower-quality studies. Promising, not proven.
- PreliminaryEarly-stage evidence — a promising hypothesis, not an established effect yet.
- LimitedVery limited evidence — treat this as a hypothesis, not proof.
- InsufficientNot enough good evidence to draw conclusions yet.
Certainty — how sure we can be that the effect is real
- Very highVery sure — strong, consistent evidence
- HighFairly sure — consistent evidence from good studies
- MediumModerately sure — new studies could change this
- LowNot sure — little or mixed evidence
- Very lowVery unsure — almost no usable evidence
Source — where the data comes from
- Meta-analysisPooled analysis of many trials — the strongest evidence
- RCTRandomized controlled trial — a strong human study design
- ClinicalA human clinical study
- Reference knowledgeFrom general health-science or pharmacology references, not a study of this exact claim
- Animal researchStudied in animals, not humans
- Community reportsAggregated user reports — anecdotal signal, not evidence
- TheoreticalMechanism-based reasoning, not yet tested
Study grade — quality of each underlying study (A best, D weakest)
- AHigh-quality — strong, consistent human trials
- BGood — solid evidence with some limitations
- CModerate — limited, small, or mixed-quality studies
- DWeak — preliminary, indirect, or animal-only
Confidence — how strongly the sources back a finding
A 0–100 score from study quality and agreement
Most supplement evidence is graded C–D. Read it as preliminary signal, not proof.
Full write-up
What is it
Histamine Release is an adverse health-related effect in which the body releases histamine. It describes a biological response rather than a general measure of product quality or effectiveness. Chamomile may trigger this response in people allergic to ragweed, so the finding is specifically relevant to that group.
How interventions help
Chamomile is relevant to Histamine Release as a potential trigger rather than as an intervention intended to reduce this outcome. The concern is specific to people with ragweed allergy, in whom Chamomile may provoke histamine release; it should not automatically be generalized to people without that allergy.
This finding reflects Chamomile’s membership in the Asteraceae family, a botanical relationship that may matter when considering related sensitivities. No dose, duration, onset, or persistence after stopping is specified, so the available information cannot establish how quickly a reaction might occur, whether continuous use changes the likelihood, or how long any effect could last.
Choosing guidance
Chamomile may not be a suitable choice for people with ragweed allergy, because it can trigger histamine release in that context. For others, the available information does not identify a specific health group that has been studied, so suitability cannot be matched confidently to a defined population.
The evidence is based on pharmacology references, and it does not establish how quickly this effect appears, how much Chamomile would be needed, or whether the finding applies consistently in humans. Treat this option cautiously when comparing it with alternatives, particularly if allergy history is relevant.