Spirulina

With meals

Spirulina is a blue-green microalgae (cyanobacterium) that has been consumed as a nutrient-dense food source for centuries. It is exceptionally rich in protein, B vitamins, iron, and phycocyanin — the pigment responsible for its deep blue-green color. Spirulina is widely studied for its effects on blood lipids, antioxidant capacity, and allergic responses.

Brad StanfieldTakes it

Research Evidence

Alleviates symptoms of allergic rhinitis

Moderate

May reduce exercise-induced fatigue during endurance activity

Limited

Lowers LDL cholesterol in overweight individuals

Moderate

Reduces total cholesterol and triglycerides

Strong

May improve fasting blood glucose levels

Limited

Provides antioxidant and anti-inflammatory effects

Moderate

Source: Examine.com

Expert Evidence

9 references from 2 experts

“Personally, I do use spirulina to color my sleep supplement, but I don't plan on taking separate spirulina supplements at present.”

Spirulina “Significantly Improves Weight" in New Study

6:11

2025

2021

Safety & Cautions

Side Effects

Mild digestive discomfort
Nausea at higher doses
Potential allergic reaction in sensitive individuals
Possible contamination with microcystins if sourced from unregulated producers

Spirulina is generally well-tolerated at standard doses. However, sourcing matters — purchase only from reputable brands that test for heavy metals and microcystin contamination, and individuals with autoimmune conditions should consult a healthcare provider before use due to its immune-modulating properties.

Pairs Well With

Omega-3 Fatty Acids (EPA)Vitamin C Garlic Extract

Price Comparison

From $0.04/ct

M

Micro IngredientsBest Value

4.6

•720 ct

$0.04/ct

$25.99 total

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