Updated July 4, 2026 · 6 min read · By the Mi Herbario editorial team
Spirulina is a blue-green algae sold as a nutrient-dense supplement. Here's what it is, what it offers, and how to use it sensibly.
What is spirulina?
Spirulina is a type of blue-green algae, usually sold as a powder or tablets. It's valued for its concentration of plant protein, iron and antioxidants.
Nutritional highlights
1. Plant protein and iron
It's notably high in protein and provides iron and B vitamins.
2. Antioxidant pigments
Its color comes from phycocyanin, an antioxidant compound.
3. Easy to add to smoothies
A small spoon blends into smoothies or juices.
How to take spirulina
Form
How to use
Powder
½–1 tsp in a smoothie or juice
Tablets
Per the product label
Tip: its flavor is strong and "oceanic" — start small and blend it with fruit.
Precautions
Buy from trusted brands; poor-quality algae can be contaminated.
Not recommended for people with certain autoimmune conditions — check with a doctor.
May interact with blood thinners.
Frequently asked questions
Is spirulina good for you?
It's a nutrient-dense supplement that can complement a varied diet; quality and moderation matter.
How much spirulina per day?
Commonly ½–1 teaspoon of powder, or per the supplement label.
Does spirulina help with energy?
It provides iron and protein that support overall nutrition, but it's not an instant energy fix.
About this article: written and reviewed by the Mi Herbario editorial team, focused on clear, honest natural-wellness content. We use careful wording, always include precautions, and cite trusted health sources. Last reviewed: July 2026.
Important: this content is for educational and informational purposes only. It is not medical advice and does not replace consultation with a healthcare professional. Always talk to your doctor before starting any herb, supplement or natural remedy, especially if you are pregnant, breastfeeding, taking medication or have a health condition.