Chlorella is a green freshwater alga sold as tablets or powder.
Calculator Official intake Study doses Best form Safety Sources
This is not an essential nutrient, so there is no official daily intake. Only study doses are shown.
These are doses tested in research, not personal advice. Some exceed the upper limit because they were short courses or given under medical care.
No single dose
A meta-analysis of 10 trials (539 adults) found total cholesterol about 7.5 mg/dL and LDL about 7.7 mg/dL lower, with no change in triglycerides or HDL. The LDL effect appeared at up to 1.5 g a day. Only two trials checked the purity of their product.
No best form
Why: Product quality varies; only two trials in the meta-analysis checked purity and contamination.
Not a normal food in most diets.
Ask your doctor if you take blood thinners or medicines that suppress the immune system.
Unlike spirulina, chlorella tablets contained true vitamin B12 in a lab study, but amounts vary between products.
Pregnant, breastfeeding, on medication, or managing a health condition? Check with a doctor or pharmacist before starting a supplement.
Values checked: November 12, 2026.