SupplementPreliminary evidenceImmunity

Chia seeds (Salvia hispanica)

South American whole-food source of α-linolenic acid, soluble fibre and protein, preliminary RCTs for postprandial glucose and lipids.

Why

Chia seeds (Salvia hispanica) are nutritionally dense, about 30% fat (60% as α-linolenic acid), 33% fibre (mostly soluble), 17% protein, and rich in minerals. Small RCTs report reductions in postprandial glucose, blood pressure and inflammatory markers in type 2 diabetes (Vuksan 2017). Evidence base is smaller than for flaxseed; cardiovascular outcome data not yet available.

How it works

α-Linolenic acid partial conversion to EPA. Soluble fibre forms a viscous gel that slows gastric emptying and reduces postprandial glucose. Combined effect modulates lipid absorption.

Expected onset · Postprandial glucose acute; lipid and BP effects over 8–12 weeks

How to take

Dosage

25–50 g/day whole or ground chia seeds. Trials use up to 50 g/day for metabolic endpoints.

Timing

With meals; soaked in liquid for easier digestion

On the label

Whole seeds (or ground for better absorption). Refrigerate ground seeds (oxidation risk). Look for organic certification if relevant.

Ideal for

Adults seeking plant-source omega-3 alongside fibre; people with mild dyslipidaemia or postprandial glucose elevation; convenient as a yogurt/porridge/smoothie addition.

Safety

Adequate water intake to avoid the gel forming in throat/oesophagus, choking case reports with dry seeds. Antiplatelet effect mild. Caution with anticoagulants. May lower blood pressure additively with antihypertensives. Pregnancy: culinary doses safe.

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Evidence

At a glance

Vuksan 2017 RCT (n=77 overweight T2DM): Salba-chia 30 g/day for 6 months reduced weight, waist circumference, CRP and adiponectin vs control. Modest effects but consistent direction. Preliminary evidence, no Cochrane review, EMA HMPC monograph or EFSA-authorised health claim covers this indication; cited RCTs are small or in non-tier-1 journals. Useful as honest reference rather than evidence-grade recommendation.

Limitations

Preliminary evidence, no Cochrane review, EMA HMPC monograph or EFSA-authorised health claim covers this indication; cited RCTs are small or in non-tier-1 journals. Useful as honest reference rather than evidence-grade recommendation.

Where to get it

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