body
Fever
Adverse effectFever is an adverse body-related effect in which body temperature becomes elevated. It describes an outcome a person may experience, rather than identifying the underlying reason for that change or confirming a specific diagnosis.
Learn how Fever is presented as a body-related health effect and what to consider when reviewing its related information.
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.
CardiopracticeUnclear
Based on one study. Strongest study: a pooled analysis of several trials.
A pooled analysis whose design was not recorded reported flu-like symptoms.
Open the Cardio pageAcupuncturepracticeUnclear
Based on one study. Strongest study: a pooled analysis of several trials.
A pooled analysis of randomized trials reported fever in studies involving people with Ankylosing Spondylitis.
Open the Acupuncture pageOzone TherapypracticeUnclear
Based on one study. Strongest study: a systematic review of studies.
A 2026 systematic review pooling randomized and non-randomized human studies reported fever and chills.
Open the Ozone Therapy pageInfrared SaunapracticeUnclear
Based on one study. Strongest study: a randomized controlled trial.
A trial involving 30 people with Depression listed flu among the reported effects.
Open the Infrared Sauna page
The expert view shows every study, dose protocol and source.
What can cause it
Interventions reported to bring this on4 listedHighest probability
- →PracticesAcupunctureCertaintyLowSourceClinical1 other source
A pooled analysis of randomized trials reported fever in studies involving people with Ankylosing Spondylitis.
- →PracticesCardioCertaintyLowSourceClinical1 other source
A pooled analysis whose design was not recorded reported flu-like symptoms.
- →PracticesOzone TherapyCertaintyLowSourceClinical1 other source
A 2026 systematic review pooling randomized and non-randomized human studies reported fever and chills.
- →PracticesInfrared SaunaCertaintyLowSourceClinical1 other source
A trial involving 30 people with Depression listed flu among the reported effects.
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
Fever is an adverse body-related effect in which body temperature becomes elevated. It describes an outcome a person may experience, rather than identifying the underlying reason for that change or confirming a specific diagnosis.
When reviewing supplement-related information, fever is considered as a possible effect associated with some interventions. Its presence in an evidence summary does not mean that every person using an intervention will experience it.
How interventions help
The interventions listed here are associated with fever as an unwanted outcome, but they do not point to one shared pattern or mechanism. The findings come from different types of evidence and describe fever in varied contexts, including a temperature threshold, pyrexia, a systemic reaction after an injection, and a symptom reported alongside another condition. This variation matters: a fever signal in one setting should not automatically be treated as evidence that every use of an intervention carries the same risk.
The findings also do not establish a common dose, duration of use, time to onset, or whether fever persists after an intervention is stopped. Health status was not specified for the studies summarized here, so the results do not show whether particular groups are more or less likely to experience this outcome. Reports supported by clinical research should be interpreted separately from pharmacology references or anecdotal reports, since those sources describe different kinds of evidence rather than a single comparable estimate.
Choosing guidance
For readers comparing options specifically around fever risk, the evidence type matters more than the label alone. Clinical evidence offers the most direct information from use in people, while pharmacology references describe reported possibilities and anecdotal evidence reflects limited individual reports. These categories are not interchangeable, and the health status of the people studied is not specified, so it is unclear how well any option applies to a particular person.
The available information does not establish how much was taken, how long it was used, or how quickly fever appeared. It also does not provide a consistent comparison of whether study findings agree across different settings. As a result, options cannot be meaningfully separated here by dose, duration, or speed of onset.
An option supported by clinical evidence may suit someone who wants evidence from studies in people, whereas an option supported only by a pharmacology reference or anecdotal reports should be viewed as a reported possibility rather than a well-characterized pattern. The entries based on smaller or less direct evidence are especially difficult to apply beyond the specific circumstances described.