health
Anaphylactoid Reaction
Adverse effectAnaphylactoid Reaction is an adverse, immediate severe hypersensitivity reaction. It can involve anaphylaxis or bronchospasm and may occur after exposure to an intervention, including Vitamin B1 (Thiamine), Echinacea, Milk Thistle (Silymarin), or Psyllium Husk.
See the health context of Anaphylactoid Reaction in a clear, focused overview.
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.
Ozone TherapypracticeUnclear
Based on one study. Strongest study: a systematic review of studies.
A 2026 systematic review pooling randomized and non-randomized human studies reported anaphylactic shock.
Open the Ozone Therapy page
The expert view shows every study, dose protocol and source.
What can cause it
Interventions reported to bring this on1 listedHighest probability
- →PracticesOzone TherapyCertaintyLowSourceClinical1 other source
A 2026 systematic review pooling randomized and non-randomized human studies reported anaphylactic shock.
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
Anaphylactoid Reaction is an adverse, immediate severe hypersensitivity reaction. It can involve anaphylaxis or bronchospasm and may occur after exposure to an intervention, including Vitamin B1 (Thiamine), Echinacea, Milk Thistle (Silymarin), or Psyllium Husk. It is distinct from a mild, expected side effect because it describes a severe allergic-type reaction.
How interventions help
For this outcome, these interventions are described as potential causes rather than treatments. The relevant pattern is an immediate hypersensitivity-type reaction, with reports ranging from anaphylaxis to bronchospasm. The context of use matters: severe reactions have been reported particularly with parenteral or injectable products, while the pattern is not typical of oral dietary use for Vitamin K1.
Route and amount can therefore change the practical risk context. For Vitamin B1 (Thiamine), the reported anaphylaxis occurred with parenteral doses >500 mg. Vitamin B12 (Cobalamin) reactions have been reported most often with parenteral products, and injectable Vitamin K1 carries a recognized rare hazard, especially with intravenous administration. Other reports involve ingestion or exposure to plant-derived products, including situations involving hypersensitivity or an atopic tendency.
These findings do not establish that every formulation or use produces the same response. They indicate that formulation, route, dose, and individual sensitivity are important when interpreting reports of Anaphylactoid Reaction. The evidence applies to the reported exposure settings and should not automatically be extended to unrelated formulations or routine dietary use.
Choosing guidance
When comparing these options for anaphylactoid reaction risk, route of administration is an important distinction. The most specific warnings concern parenteral or injectable products: Vitamin B1 (Thiamine) is associated with rare anaphylaxis with parenteral doses >500 mg, while Vitamin B12 (Cobalamin) and Vitamin K1 have reports involving parenteral or injectable use. The Vitamin K1 warning is specifically associated with intravenous administration and is not typical of oral dietary use.
The options are not supported in the same way. Some descriptions come from clinical evidence, while others come from pharmacology references or reviews, so the findings should not be treated as directly interchangeable. The information does not establish a consistent time to onset, a required duration of use, or a dose range for most options, and it does not show that one option is safer than another across all forms.
For choosing between them, the most relevant considerations are whether the product is oral or injectable, whether a parenteral product is being used, and whether there is a relevant history of hypersensitivity. Echinacea warrants particular attention for people with Asteraceae hypersensitivity or an atopic tendency, while psyllium-related reactions have been reported after ingestion of a psyllium-containing food. These distinctions make route and individual allergy history more useful for selection than treating all listed options as equivalent.