Allergic rhinitis: what the evidence supports

3 graded interventions for allergic rhinitis, ranked by strength of evidence.

Overall grade: Grade B
Last revised: Jul 10, 2026; 3
graded outcomes: 0
references listed

Assembled by the app from other entries in this library. It adds no evidence of its own — follow the links to the entries it draws on.

1 at grade B · 2 at grade C — 3 graded rows

What is known

Each outcome with its grade (how strong the evidence is, A to D), the size of the effect where the entry records one, and how often studies agree.

Outcome	Grade	Effect size	Agreement
ButterburAntihistamine-comparable in trials	Evidence grade B	Moderate	mixed
Stinging NettleLimited	Evidence grade C	Small	low
SpirulinaSome relief	Evidence grade C	Small	mixed

ButterburEvidence grade B
Antihistamine-comparable in trials
Moderatemixed
Stinging NettleEvidence grade C
Limited
Smalllow
SpirulinaEvidence grade C
Some relief
Smallmixed

What is uncertain

Read off the same rows as above. Nothing here is added that the entry does not itself record.

Thin evidence: Stinging Nettle (grade C); Spirulina (grade C).
Studies disagree: Butterbur (mixed agreement).

The evidence in words

The evidence map

This is the ranked evidence for allergic rhinitis: every compound in the knowledge base with a graded effect, best-supported first. Grades reflect replication and effect size, not popularity or marketing.

Best-supported

Butterbur (grade B) — Antihistamine-comparable in trials

Weaker or unproven

Stinging Nettle (grade C) — Limited · Spirulina (grade C) — Some relief

Goes with

ButterburGrade BEvidence grade B
Stinging NettleGrade CEvidence grade C
SpirulinaGrade CEvidence grade C

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Sources

This entry lists no references of its own — it is assembled from the entries it links to, whose sources are on their pages.

Last revised Jul 10, 2026. A grade is this entry's reading of the evidence, not medical advice.