In the scientific literature, the total daily dose of chlorella ranges from 6 to 10 grams per day. Although there aren’t clear reasons for this range, it appears to be somewhat effective. Higher doses have not been sufficiently tested, and the optimal dose of supplemental chlorella is not known.

For exercise performance, most studies use a dose of 6 grams per day for 3–4 weeks, although emerging research suggests that even a single acute dose (6 grams) of chlorella increases plasma levels of lutein, beta-carotene, and zeaxanthin for up to 72 hours.^[1]

Doses of up to 10–15 grams per day appear to be safe. Cardiovascular benefits have been observed with 4 grams per day, and more than 1.5 grams per day seems to be necessary to benefit glycemic control in type 2 diabetes.^[2]