Chia Seed

Salvia hispanica · Chia

Snapshot

Indications	Contraindications
Blood pressure^{1, 2} Waist circumference^{1, 2} C-reactive protein² Postprandial glucose³ Satiety⁴	Swallowing problems⁴

Chia seed is the seed of Salvia hispanica, a Central and South American food rich in fiber and the plant omega-3 alpha-linolenic acid (ALA)⁴. Its fiber swells into a gel in liquid, which underlies its use for fullness⁴. People take it for cardiometabolic risk factors, chiefly blood pressure and central adiposity, and for glycemic control and satiety, where trials are small and results mixed^{1, 3}. The typical patient is an overweight adult, or one with type 2 diabetes or metabolic syndrome^{2, 3}.

Meta-analyses of randomized trials agree on lower systolic blood pressure and waist circumference without a change in body mass index^{1, 2}. Effects on lipids, fasting glucose, and hemoglobin A1c were not significant in overweight adults^{2, 5}. An umbrella review graded the certainty of evidence as moderate to low⁶. In cultured fat cells and macrophages, a 2020 laboratory study found a chia seed fatty acid extract limited lipid accumulation and inflammatory gene expression; no human trial has tested this. Products listing chia seed number in the thousands in the National Institutes of Health label database, sold as whole or ground seed powder, capsules, and oil softgels; see Form comparison.

The swallowing caution exists because dry seeds absorb many times their weight in water, and a case report describes esophageal obstruction after dry ingestion⁴. Allergic reactions, including anaphylaxis, are described in case reports⁷. The Memorial Sloan Kettering fact page flags additive blood pressure lowering with antihypertensive medications⁴.

Last updated October 17, 2026. Read how we make monographs.

In the full monograph

52 sources, 38 studies

When to useThe situations practitioners use it for, each with the reason and the study behind it.
SafetyWho should avoid it, who needs extra care, and the side effects reported in studies.
InteractionsThe medicines and supplements it interacts with, the effect of each, and what labeling says to watch.
Protocol notesThe doses used in studies, how and when they were taken, and how the forms on the market compare.
How it worksWhat it is and how it works in the body, in plain terms.
Published studiesThe studies behind each use, popular claims checked against them, and trials still under way.
Word of mouthWhat patients and practitioners report online, kept separate from the clinical evidence.
Clinical perspectiveA closing read of where the evidence is solid, where it is thin, and what has not been studied.

Snapshot

In the full monograph

Sources