What are the side effects of Chlorella?

Users most often report seizures, bedridden, depression, anger, tension. Side effects came up 6 times across 33 reports.

User reports can't establish safety. PubMed lists 21 meta-analyses and 26 randomized trials. Talk to a doctor or pharmacist, especially if you take other medication.

Chlorella side effects

Across 33 first-hand reports, people mentioned a side effect 6 times (about 18 per 100 reports). The most common: seizures, bedridden, depression. User reports show what people notice — they can't tell you whether Chlorella is safe for you.

Reported side effects

seizures1

bedridden1

depression1

anger1

tension1

heart palpitations1

In their own words

“I've tried Chlorella which does nothing to my anxiety”

Didn't helpRead the discussion ↗

“I can't take it anymore because of iron. Like with chlorrella, but chlorella have even more iron. Super angry, tense and heart palpitation.”

MixedRead the discussion ↗

Is Chlorella safe? What the research covers

AResearch: Strong21 meta-analyses · 26 randomized trials on PubMed

Front Pharmacol · 2025

Systematic review and network meta-analysis of the effects of plant active substance on quality of life in breast cancer patients

Conclusion: The network meta-analysis indicates that Withania somnifera was effective in enhancing quality of life and contributed to a reduction in therapeutic side effects in BC patients. Our findings support the therapeutic potential of plant bioactive substances in breast cancer care; however, further clinical validation of their efficacy is warranted.

Nutrients · 2025

The Role of Chlorella and Spirulina as Adjuvants of Cardiovascular Risk Factor Control: A Systematic Review and Meta-Analysis of Randomised Controlled Trials