Because chlorella contains a cellulose cell wall (unlike spirulina), it must undergo mechanical processing to break down these cell walls before human consumption to avoid gastrointestinal side effects like nausea, vomiting, and stomach pain.[1] Furthermore, some studies have confirmed that chlorella is an allergen, so some individuals (notably children) may be sensitive to it or want to avoid its consumption.[2]
What are chlorella’s main drawbacks?
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•Last Updated: May 16, 2025
Chlorella's main drawbacks include the need for mechanical processing to break down its cellulose cell wall to prevent gastrointestinal side effects such as nausea, vomiting, and stomach pain. Additionally, it can act as an allergen, and therefore, some individuals (particularly children) may be sensitive to it or may need to avoid it.